Goldstone Radar Observations Planning: (163899) 2003 SD220, 2007 EJ, and Comet 46P/Wirtanen


Background


2003 SD220
2003 SD220 was discovered by LONEOS on September 29, 2003, and subsequently linked with 2000 AD229, 
which was also discovered by LONEOS on 2000 January 6.  Although this object has two provisional designations,
it is currently known as 2003 SD220.  

2003 SD220 has an extremely slow rotation period of roughly 12 days, and lightcurves suggest
non-principal axis rotation (Warner 2016, Carbognani and Buzzi 2016).  Radar images at Goldstone and Arecibo in 2015 revealed a  
highly-elongated and very-slowly rotating object that is consistent with expectations
from the lightcurves.  The 2015 radar images provided a small number of snapshots that did
not cover much rotation so a significant fraction of the surface has not yet been seen.
Nugent et al. (2016) estimated a diameter of 0.8 +- 0.02 km and
an optical albedo of 0.3 +- 0.04 from thermal IR observations by the NEOWISE spacecraft. 
Vis-IR observations by Perna et al. (2016) place 2003 SD220 in the Sr spectral class.   

2003 SD220 will approach within 0.019 au on December 22 when it will be one of the strongest 
radar targets of the year, with signal-to-noise ratios per run at Goldstone approaching 1000 on Dec. 21-22.
The 2018 encounter will be at about 1/4th the distance of the 2015 flyby, so the SNRs will be 
nearly 20x stronger, and if the observations go well, we hope to obtain delay-Doppler images with range resolutions
as fine as 1.875 m/pixel.  

Radar observations at Goldstone will begin on November 24 during 
time that overlaps tracks scheduled for 2007 EJ.   Other tracks are scheduled starting on
December 7 when the SNRs will be much stronger.  Some of the Goldstone observations will use DSS-13 to transmit.
We are planning request time at Green Bank to receive once the complete schedules at DSS-14 and DSS-13 are available.

Preliminary observations occurred at Arecibo on August 25 at a distance 
of 0.24 au.   Additional observations at Arecibo are scheduled on December 18-22, 
and reception may occur at Green Bank during some of the time.  Radar speckle observations
are also planned using Arecibo to transmit and elements of the VLBA to receive.  

CW radar observations are also planned in Australia using one of the DSN antennas at Canberra to transmit 
at 7190 MHz and the Australia Telescope Compact Array to receive.  

We also plan to conduct interntational bistatic observations with the Sardinia Radio Telescope
and the Quasar VLBI network in Russia.

Radar observations of 2003 SD220 occur on some of the same dates as comet 46P/Wirtanen, 
and the view periods for the two objects partially overlap. 

2003 SD220 has an orbital period of 0.754 years and is currently close to a 4:3 mean motion 
resonance with Earth; flybys within 0.1 au began in 2015 and will occur at three year 
intervals until 2024.  The repeated opportunities to obtain 
ranging measurements may lead to detection of the Yarkovsky effect for this object.
This asteroid also approaches within 0.1 au of Venus relatively often. 

The Minor Planet Center has classified 2003 SD220 as a "Potentially Hazardous Asteroid."
This asteroid is also on NASA's NHATS list of potential spacecraft mission targets, although
no actual mission is planned to visit this asteroid.


Comet 46P/Wirtanen 46P/Wirtanen is a short-period comet that was discovered in 1948 by Carl Wirtanen at Lick Observatory in California. Comet Wirtanen will approach within 0.0775 au on 2018 December 16. This will be among the closest comet approaches in the last fifty years and it provides an important opportunity to study a comet with radar and at other wavelengths. This is also the closest approach by this particular comet for centuries. Opportunities to observe comets with radar are uncommon and to date radar observations of only twenty have occurred. The close approach will also occur only four days after perihelion passage when cometary activity could be at its peak. This comet has been studied extensively during prior apparitions. The nucleus is about 1.1 km in diameter and estimates of the rotation period yield values of 6 or 7.6 h. It is possible that the nucleus is in a non-principal axis spin state. The lightcurves suggest a moderately elongated aspect ratio of at least 1.4. Consequently, variations in the bandwidth of the nucleus should be visible if the SNRs are sufficiently strong. Historically this comet has been very active during perihelion passages, but we do not know if it will develop a conspicuous tail. The SNRs at Goldstone could be relatively weak due to the reduced transmitter power of 100 kW, and as such, we will concentrate on CW observations of the nucleus and coma. CW echoes can provide important constraints on the size distribution of coma particles. The SNRs at Arecibo will be much stronger and are ideal for detailed radar imaging of the nucleus, which should reveal its dimensions and surface features, and estimation of the spin state. Radar observations at Goldstone are scheduled from Dec. 7-21. Arecibo observations will occur between Dec. 11-19. View periods at Goldstone for Comet Wirtanen and 2003 SD220 overlap on some days. Because the comet will be close to Earth in mid-December, it may reach 4th magnitude and be visible to the naked eye. However, predicting cometary magnitudes is notoriously unreliable so it's also possible that the comet could be much fainter so that binoculars or a small telescope are necessary to see it. At the time of closest approach, the comet will appear in the constellation Taurus close to the Pleiades. This comet was the original target for ESA's Rosetta mission prior to a launch delay that forced a change of the target to Comet 67P/Churyumov-Gerasimenko. Comet Wirtanen was also the target for the proposed Comet Hopper mission in a recent NASA Discovery Program competition. Due to its perihelion distance near Earth, its short orbital period, and relatively low orbital inclination, Comet Wirtanen could be a candidate for a future spacecraft mission. Consequently, any information on its physical properties is very important. Comet Wirtanen currently has an orbital period of 5.4 years. It makes frequent approaches within 0.6 au of Jupiter that change the orbital parameters. For example, in 1984 the comet approached within 0.45 au of Jupiter, and in 2054 it will approach within 0.12 au, an encounter that will produce substantial changes in the comet's heliocentric orbit. The 2018 radar observations of Comet Wirtanen are part of a multi-wavelength campaign by many researchers using a suite of telescopes. For more information on observations at other telescopes, please see the University of Maryland Comet Wirtanen website:
http://wirtanen.astro.umd.edu/46P/46P_2018.shtml Below is a link to an article posted by Sky and Telescope that features information on the comet, a finder chart, and information on other comets visible in small telescopes in 2018: https://www.skyandtelescope.com/observing/bright-comet-prospects-for-2018/
(410088) 2007 EJ 2007 EJ will approach within 0.062 au on 2018 November 22. In 2015, this asteroid was observed with radar at Arecibo, in the thermal infrared by NASA's NEOWISE mission, and with photometry. Lightcurves obtained by Brian Warner give a rotation period of 4.8 hours and a low lightcurve amplitude of 0.16 magnitudes, which implies a shape with a low elongation. The NEOWISE results indicate a diameter of 1 km and an optical albedo of 0.1 (Nugent et al. 2015). 2007 EJ was discovered on 2007 March 9 by the Mt. Lemmon Survey. This asteroid will be a relatively weak radar target at Goldstone in late November, 2018, but a strong imaging target at Arecibo in early December, when it might be possible to obtain delay-Doppler images with a resolution as fine as 15 m/pixel. Goldstone observations are scheduled from Nov. 24-29 on dates when the view periods overlap those for 2003 SD220 extensively. The Arecibo schedule is not yet available, but several tracks are likely beginning on November 29.
Orbital and Physical Characteristics  
Name                     2003 SD220                          Comet Wirtanen                   2007 EJ    
Number                   163899                              46P                              410088
Discoverer               LONEOS.                             Carl Wirtanen/Lick Observatory   Mt. Lemmon Survey
Discovery date           2003 September 29, 2000 January 6   1948 January 17                  2007 March 9
orbit type               Aten                                Jupiter family comet             Apollo
Close approach dist.     0.019 au                            0.077 au                         0.062 au
Close approach dist.     7.4 lunar distances                 30.2 lunar distances             24.0 lunar distances
Close approach date      2018 December 22                    2018 December 16                 2018 November 22

semimajor axis           0.828 au                            3.0897 au                        2.499 au
eccentricity             0.210                               0.658                            0.629
inclination              8.5 deg                             11.7 deg                         8.3 deg
Orbital period           0.754 years                         5.43 years                       3.95 y
perihelion distance      0.655 au                            1.055 au                         0.926 au
aphelion distance        1.002 au                            5.124 au                         4.072 au
Tisserand parameter      7.055 -> asteroidal

absolute magnitude (H)   17.3                                Not applicable                   18.1
diameter                 0.8 +- 0.02 km                      1.1 km                           1 km      Nugent et al. 2015
optical albedo           0.3 +- 0.04                         unknown                          0.095     Nugent et al. 2015
rotation period         ~287 hours                           6 h or 7.6 h; NPA?               4.781 h   Warner et al. 2015
pole direction           unknown                             unknown                          unknown
lightcurve amplitude    ~0.7 mag                                                              0.16 mag  Warner et al. 2015
spectral class           Sr                                  Not applicable                   unknown
                         PHA, NHATS                          MOID = 0.0706 au                 MOID = 0.058 au

2003 SD220 Future close Earth approaches through 2050: Date (TDB) Body CA Dist MinDist MaxDist Vrel TCA3Sg Nsigs P_i/p A.D. 2018 Dec 22.04475 Earth .018901 .018901 .018901 6.239 0.06 3.24E5 .000000 A.D. 2021 Dec 17.72653 Earth .036282 .036280 .036284 5.611 0.45 3.80E5 .000000 A.D. 2024 Dec 02.52496 Earth .088340 .088337 .088342 5.481 1.10 1.38E6 .000000 Last update: 2018 December 13

Discovery M.P.E.C.


2003 SD220
https://minorplanetcenter.net/mpec/K03/K03S91.html

2007 EJ
https://www.minorplanetcenter.net/mpec/K07/K07E35.html


SNR Calculations


2003 SD220
GOLDSTONE SNRS
2003 SD220:  D = 0.7 km,  P = 287 h,  OC albedo = 0.1
                                                          Ptx = 100 kW  <----Ptx=180 kW-----> Ptx=80 kW  Ptx=20 kW
                                                       <--MONOSTATIC--> DSS14-DSS13 DSS14-GBT DSS13-GBT  DSS36-ATCA
w  DOY   start date    window      RA dec   dist runs   SNR/day SNR/run   SNR/RTT    SNR/RTT   SNR/RTT    SNR/RTT
47 323  2018 Nov 19  07:57-22:20  169 +56  0.111  229      32      2
47 324  2018 Nov 20  07:56-22:19  169 +56  0.108  235      35      2
47 325  2018 Nov 21  07:55-22:18  170 +56  0.105  242      39      3
47 326  2018 Nov 22  07:54-22:17  171 +56  0.102  249      44      3
47 327  2018 Nov 23  07:54-22:16  172 +56  0.099  256      50      3
47 328  2018 Nov 24  07:53-22:15  173 +56  0.096  264      57      4                                               Scheduled. Overlaps 2007 EJ
47 329  2018 Nov 25  07:53-22:15  173 +56  0.093  273      65      4
48 330  2018 Nov 26  07:53-22:14  174 +56  0.090  282      74      5                                               Scheduled. Overlaps 2007 EJ
48 331  2018 Nov 27  07:53-22:14  175 +56  0.087  292      85      5                                               Scheduled. Overlaps 2007 EJ
48 332  2018 Nov 28  07:53-22:14  176 +56  0.083  303      99      6                 25  
48 333  2018 Nov 29  07:54-22:14  178 +56  0.080  314     110      7                 29                            Scheduled. Overlaps 2007 EJ
48 334  2018 Nov 30  07:55-22:15  179 +56  0.077  327     140      8                 33
48 335  2018 Dec 01  07:57-22:16  180 +56  0.074  340     160      9                 37                     
48 336  2018 Dec 02  07:58-22:17  181 +56  0.070  355     190     11                 46                     
49 337  2018 Dec 03  08:01-22:18  183 +55  0.067  371     230     13                 54                     
49 338  2018 Dec 04  08:04-22:20  184 +55  0.064  389     280     15                 62           5        
49 339  2018 Dec 05  08:08-22:22  186 +55  0.061  408     340     18        10       75           6        
49 340  2018 Dec 06  08:12-22:25  188 +55  0.057  429     430     22        12       91           8        
49 341  2018 Dec 07  08:18-22:28  190 +55  0.054  453     540     27        15      110          10                Scheduled
49 342  2018 Dec 08  08:25-22:32  192 +54  0.051  478     680     34        18      140          12                Scheduled
49 343  2018 Dec 09  08:33-22:36  195 +54  0.048  507     880     42        23      170          15                Scheduled
50 344  2018 Dec 10  08:42-22:41  198 +53  0.045  538    1100     54        29      220          19        
50 345  2018 Dec 11  08:54-22:47  201 +52  0.041  573    1500     69        37      290          24         
50 346  2018 Dec 12  09:08-22:53  205 +51  0.038  610    2100     90        49      370          32                Scheduled                        El > 75 deg
50 347  2018 Dec 13  09:24-23:00  209 +50  0.035  652    2800    120        65      500          42                Scheduled                        1554-1634
50 348  2018 Dec 14  09:43-23:07  213 +48  0.032  697    3900    160        86      660          56                                                 1545-1710
50 349  2018 Dec 15  10:06-23:14  218 +46  0.030  744    5600    220       120      910          77                Scheduled                        1546-1741
50 350  2018 Dec 16  10:33-23:22  223 +43  0.027  791    7900    310       170     1300         110                Scheduled                        1552-1809    
51 351  2018 Dec 17  11:04-23:28  229 +39  0.024  837   11000    420       230     1700         150                Scheduled                        1605-1834
51 352  2018 Dec 18  11:39-23:34  235 +34  0.022  873   16000    580       310     2400         200       north    Scheduled at DSS-13 and DSS-14   1627-1853
51 353  2018 Dec 19  12:18-23:38  242 +27  0.021  892   21000    760       410     3100         270        14      Scheduled at DSS-13              1702-1901
51 354  2018 Dec 20  13:00-23:39  248 +19  0.019  884   25000    920       500     3800         320        16      Scheduled at DSS-13 and DSS-14
51 355  2018 Dec 21  13:46-23:36  255 +10  0.019  838   27000   1000       540     4100         350        18      Scheduled at DSS-13
51 356  2018 Dec 22  14:34-23:30  261  +1  0.019  756   25000    980       530     4100         340        18      Scheduled at DSS-13 and DSS-14
51 357  2018 Dec 23  15:23-23:20  267  -7  0.020  647   19000    820       440     3400         290        15      Scheduled at DSS-13
52 358  2018 Dec 24  16:12-23:07  272 -15  0.021  526   13000    610       330     2500         210        11
52 359  2018 Dec 25  17:02-22:49  277 -21  0.023  407    7900    420       230     1700         150         8 
52 360  2018 Dec 26  17:52-22:27  282 -27  0.026  295    4500    280       150     1200          98         5      Scheduled at DSS-13 and DSS-14
52 361  2018 Dec 27  18:46-21:58  285 -31  0.028  188    2400    180        97      740          63         3
52 362  2018 Dec 28  20:03-21:02  289 -34  0.031   53     870    120        65      500          42

Update: Goldstone observations in December, 2018 have shown that actual SNRs are roughly 
four times stronger than the numbers shown above.  

After Dec. 28 this asteroid will move too far south for Goldstone to track.

Goldstone SNRs assume Ptx = 100 kW and Tsys = 17 K

Due to the slow rotation, images obtained as early as Dec. 7 may place only 10-14 Doppler bins on 
the asteroid using a full-length FFT, so we may request time at the GBT starting on that date or
shortly afterward.

2003 SD220 will reach high elevations during some dates when time is scheduled at Goldstone, the 
tracks occur when elevations are low enough that there won't be any problems.


DSS-43 Rise/Set Times (UTC)
DOY       Date           Start Stop    Delta (au)
...too far north before Dec. 18...
352-353  2018 Dec 18-19  22:50-01:26   0.022
353-354  2018 Dec 19-20  22:01-02:59   0.020    Scheduled on DOY 354     at DSS-43
354-355  2018 Dec 20-21  21:35-04:10   0.019
355-356  2018 Dec 21-22  21:18-05:10   0.019    Scheduled on DOY 355-356 at DSS-36
356-357  2018 Dec 22-23  21:07-06:01   0.019    Scheduled on DOY 356-357 at DSS-36
357-358  2018 Dec 23-24  21:01-06:44   0.020 
358-359  2018-Dec 24-25  20:57-07:20   0.022
359-360  2018-Dec 25-26  20:56-07:50   0.024
360-361  2018-Dec 26-27  20:56-08:15   0.026
361-362  2018-Dec 27-28  20:57-08:36   0.029

Horizons = 20 degrees.



2003 SD220
ARECIBO SNRS
Arecibo SNRs in August, assuming Ptx = 400 kW:
 start date    window        RA, dec   dist    runs      SNR/day   SNR/run
2018 Aug 13  16:31-19:14    163, +23  0.289     17         15         4
2018 Aug 14  16:28-19:10    163, +24  0.284     17         16         4
2018 Aug 15  16:25-19:05    164, +25  0.279     17         17         4
2018 Aug 16  16:23-19:01    164, +26  0.274     17         18         5
2018 Aug 17  16:20-18:55    164, +26  0.269     17         19         5
2018 Aug 18  16:18-18:50    164, +27  0.265     17         20         5
2018 Aug 19  16:16-18:44    164, +28  0.261     17         21         5   
2018 Aug 20  16:14-18:37    164, +29  0.257     16         22         6
2018 Aug 21  16:12-18:30    163, +30  0.253     16         23         6
2018 Aug 22  16:11-18:23    163, +31  0.250     15         23         6
2018 Aug 23  16:10-18:15    163, +32  0.247     15         23         7
2018 Aug 24  16:10-18:06    163, +33  0.244     14         23         7
2018 Aug 25  16:10-17:56    163, +34  0.241     13         22         7  Scheduled
2018 Aug 26  16:11-17:45    163, +35  0.239     11         20         6
2018 Aug 27  16:14-17:33    162, +36  0.236     10         18         6
2018 Aug 28  16:19-17:19    162, +37  0.234      7         14         6
2018 Aug 29  16:30-16:58    162, +38  0.232      3          9         5

2003 SD220 moves too far south to track at Arecibo between Aug 29-Dec 18.
                                                                               Goldstone
Arecibo SNRs in December, assuming Ptx = 900 kW:                            Schedule overlap
 start date    window        RA, dec   dist   runs     SNR/day   SNR/run    DSS-14     DSS-13
2018 Dec 18  13:27-15:09    234, +35  0.023    129     490000     48000     None       1327-1509
2018 Dec 19  13:24-15:55    241, +28  0.021    207     930000     69000     None       1324-1555 
2018 Dec 20  13:37-16:25    247, +21  0.020    243    1300000     85000     1337-1530  1337-1625
2018 Dec 21  14:04-16:40    254, +12  0.019    237    1400000     92000     None       1450-1640 
2018 Dec 22  14:53-16:31    260,  +3  0.019    149     930000     86000     1453-1535  None

New klystrons will be installed at Arecibo in the fall of 2018, so it is possible
that the transmitter power will return to ~900 kW by December.
Update: one new klystron has been installed and is providing about 400 kW.

Arecibo SNRs assume Tsys = 25 K. 

The Arecibo view periods entirely overlap the view periods at Goldstone. The table above
also shows when Goldstone antennas are scheduled to facilitate comparison with the Arecibo schedule. 


Comet Wirtanen Goldstone SNRs Assumptions: D = 1.2 km, P = 6 h, OC albedo = 0.1 w DOY start date window RA, dec dist runs SNR/day SNR/run 49 339 2018 Dec 05 02:07-09:19 42, -12 0.103 126 10 1 49 340 2018 Dec 06 01:59-09:28 43, -10 0.099 136 12 1 49 341 2018 Dec 07 01:50-09:38 45, -8 0.095 147 14 1 Scheduled: Overlaps 2003 SD220 0720-0935 49 342 2018 Dec 08 01:43-09:48 46, -5 0.092 158 16 1 Scheduled: Overlaps 2003 SD220 0725-0945 49 343 2018 Dec 09 01:35-09:59 47, -3 0.089 170 19 2 Scheduled: Overlaps 2003 SD220 0735-0955 50 345 2018 Dec 11 01:20-10:22 50, +3 0.084 194 26 2 50 346 2018 Dec 12 01:13-10:35 52, +7 0.082 206 29 2 CANCELLED 50 347 2018 Dec 13 01:06-10:48 54, +10 0.080 218 33 2 CANCELLED 50 348 2018 Dec 14 01:00-11:02 56, +14 0.079 229 35 3 CANCELLED 50 349 2018 Dec 15 00:55-11:16 58, +17 0.078 239 37 3 CANCELLED 50 350 2018 Dec 16 00:49-11:31 60, +21 0.077 248 39 3 CANCELLED 51 351 2018 Dec 17 00:45-11:47 62, +25 0.078 255 39 3 Scheduled: overlaps 2003 SD220 1105-1147 51 352 2018 Dec 18 00:41-12:03 65, +29 0.078 261 38 3 Scheduled: overlaps 2003 SD220 1140-1203 51 353 2018 Dec 19 00:38-12:19 67, +32 0.079 265 36 2 CANCELLED 51 354 2018 Dec 20 00:36-12:36 70, +36 0.081 267 34 2 CANCELLED 51 355 2018 Dec 21 00:34-12:53 73, +39 0.083 267 32 2 CANCELLED 51 356 2018 Dec 22 00:33-13:10 76, +42 0.085 266 29 2 No overlap with 2003 SD220 51 357 2018 Dec 23 00:33-13:27 79, +44 0.088 264 26 2 52 358 2018 Dec 24 00:33-13:44 82, +47 0.091 260 23 2 52 359 2018 Dec 25 00:34-14:00 86, +49 0.094 256 20 1 52 360 2018 Dec 26 00:36-14:16 89, +51 0.098 251 17 1 52 361 2018 Dec 27 00:38-14:32 92, +52 0.102 245 15 1 52 362 2018 Dec 28 00:41-14:47 95, +54 0.106 239 13 1 52 363 2018 Dec 29 00:44-15:01 98, +55 0.110 232 11 1 Most of the comet tracks have been cancelled due to lower-than-expected SNRs. Goldstone SNRs assume Ptx = 100 kW. JPL/Horizons solution 900542 (2018) Comet Wirtanen Arecibo SNRs start date window RA, dec dist runs SNR/day SNR/run 2018 Dec 10 02:00-02:50 48, 0 0.087 191 830 130 2018 Dec 11 01:38-03:16 50, +3 0.084 199 1200 200 Scheduled 2018 Dec 12 01:27-03:33 51, +6 0.082 207 1600 230 2018 Dec 13 01:20-03:46 53, +9 0.080 215 1900 250 Scheduled 2018 Dec 14 01:17-03:55 55, +13 0.079 224 2100 260 Scheduled 2018 Dec 15 01:18-04:03 57, +17 0.078 227 2200 270 Scheduled 2018 Dec 16 01:21-04:08 59, +20 0.078 233 2300 280 Scheduled 2018 Dec 17 01:29-04:11 61, +24 0.078 236 2300 280 Scheduled 2018 Dec 18 01:40-04:11 64, +28 0.078 235 2100 270 Scheduled 2018 Dec 19 01:56-04:07 66, +31 0.079 237 1900 260 Scheduled 2018 Dec 20 02:20-03:57 69, +35 0.081 233 1400 220 Arecibo SNRs assume Ptx = 900 kW, gain = 10 K/Jy, and Tsys = 25 K
2007 EJ Goldstone SNRs Assumptions: D = 1 km, P = 4.78 h, OC albedo = 0.1 w DOY start date window RA, dec dist runs SNR/day SNR/run 47 324 2018 Nov 20 19:02-21:48 248, -32 0.062 81 24 3 47 325 2018 Nov 21 17:59-22:05 244, -28 0.062 122 32 3 47 326 2018 Nov 22 17:07-22:13 239, -24 0.062 151 38 3 47 327 2018 Nov 23 16:22-22:16 235, -20 0.062 173 41 3 47 328 2018 Nov 24 15:42-22:16 231, -16 0.063 189 42 3 Scheduled. Overlaps 2003 SD220 47 329 2018 Nov 25 15:07-22:15 227, -12 0.065 200 40 3 48 330 2018 Nov 26 14:35-22:12 224, -9 0.067 206 37 3 Scheduled. Overlaps 2003 SD220 48 331 2018 Nov 27 14:07-22:09 221, -5 0.070 208 33 2 Scheduled. Overlaps 2003 SD220 48 332 2018 Nov 28 13:42-22:04 218, -2 0.073 207 28 2 48 333 2018 Nov 29 13:19-22:00 216, +1 0.077 205 24 2 Scheduled. Overlaps 2003 SD220 48 334 2018 Nov 30 12:58-21:55 214, +3 0.081 201 20 2 48 335 2018 Dec 01 12:39-21:50 212, +6 0.085 196 17 1 Goldstone SNRs asssume Ptx = 100 kW and Tsys = 17 K. 2007 EJ Arecibo SNRs start date window RA, dec dist runs SNR/day SNR/run 2018 Nov 29 13:47-14:52 216, 0 0.076 25 720 150 2018 Nov 30 13:17-14:57 214, +3 0.080 37 880 160 Scheduled 2018 Dec 01 12:55-14:55 212, +5 0.085 43 850 140 Scheduled 2018 Dec 02 12:37-14:51 210, +7 0.089 45 750 120 2018 Dec 03 12:22-14:45 209, +9 0.093 46 640 99 2018 Dec 04 12:09-14:39 207, +11 0.098 46 540 83 2018 Dec 05 11:57-14:32 206, +12 0.103 45 450 70 2018 Dec 06 11:47-14:25 205, +14 0.108 44 380 60 2018 Dec 07 11:37-14:18 204, +15 0.113 43 320 51 2018 Dec 08 11:28-14:11 203, +16 0.118 42 270 44 2018 Dec 09 11:20-14:04 202, +17 0.123 40 230 38 2018 Dec 10 11:13-13:58 201, +18 0.128 36 190 33 2018 Dec 11 11:06-13:51 200, +19 0.134 34 160 28 2018 Dec 12 10:59-13:44 200, +19 0.139 36 140 25 2018 Dec 13 10:52-13:38 199, +20 0.144 34 120 22 2018 Dec 14 10:46-13:32 198, +21 0.149 33 110 19 2018 Dec 15 10:40-13:25 198, +21 0.154 32 93 17 2018 Dec 16 10:35-13:19 197, +22 0.159 31 82 15 2018 Dec 17 10:29-13:13 197, +22 0.165 30 72 14 2018 Dec 18 10:24-13:07 197, +23 0.170 29 64 12 2018 Dec 19 10:19-13:01 196, +23 0.175 28 56 11 2018 Dec 20 10:13-12:56 196, +24 0.180 27 50 10 2018 Dec 21 10:08-12:50 195, +24 0.185 26 45 9 2018 Dec 22 10:03-12:44 195, +24 0.190 25 40 8 2018 Dec 23 09:58-12:38 195, +25 0.195 24 36 8 2018 Dec 24 09:54-12:33 194, +25 0.200 24 33 7 2018 Dec 25 09:49-12:27 194, +25 0.204 23 29 6 2018 Dec 26 09:44-12:22 194, +26 0.209 22 27 6 2018 Dec 27 09:39-12:16 193, +26 0.214 22 24 5 2018 Dec 28 09:35-12:10 193, +26 0.218 21 22 5 2018 Dec 29 09:30-12:05 193, +27 0.223 21 21 5 Arecibo SNRs assume Ptx = 900 kW and Tsys = 25 K.

Track Assignments


DOY  BOA   BOT   EOT   EOA
328 1415 1545 1705 1735  DSS-14  GSSR   AST 2007 EJ/2003 SD220
330 1305 1435 1700 1730  DSS-14  GSSR   AST 2007 EJ/2003 SD220           
331 1240 1410 1530 1600  DSS-14  GSSR   AST 2007 EJ/2003 SD220 
333 1150 1320 1650 1720  DSS-14  GSSR   AST 2007 EJ/2003 SD220   
341 0650 0820 1315 1345  DSS-14  GSSR   AST 2003 SD220/Comet Wirtanen 
342 0655 0825 1310 1340  DSS-14  GSSR   AST 2003 SD220/Comet Wirtanen 
343 0705 0835 1305 1335  DSS-14  GSSR   AST 2003 SD220/Comet Wirtanen
344 0715 0845 1250 1320  DSS-14  GSSR   AST 2003 SD220 
345 0725 0855 1325 1355  DSS-14  GSSR   AST 2003 SD220
346 0640 0810 0930 1000  DSS-14  GSSR   COMET WIRTANEN    CANCELLED
346 1000 1130 1300 1330  DSS-14  GSSR   AST 2003 SD220
347 0640 0810 0930 1000  DSS-14  GSSR   COMET WIRTANEN    CANCELLED
347 1000 1130 1250 1320  DSS-14  GSSR   AST 2003 SD220
348 0800 0930 1055 1125  DSS-14  GSSR   COMET WIRTANEN    CANCELLED
349 0455 0625 0840 0910  DSS-14  GSSR   COMET WIRTANEN    CANCELLED
349 0910 1040 1240 1310  DSS-14  GSSR   AST 2003 SD220
350 0640 0810 0925 0955  DSS-14  GSSR   COMET WIRTANEN    CANCELLED
350 0955 1125 1240 1310  DSS-14  GSSR   AST 2003 SD220
351 1005 1135 1305 1335  DSS-14  GSSR   AST 2003 SD220/Comet Wirtanen
352 1010 1140 1305 1335  DSS-14  GSSR   AST 2003 SD220/Comet Wirtanen
352      1140 1510       DSS-13  GSSR   AST 2003 SD220
353 0635 0805 1210 1250  DSS-14  GSSR   COMET WIRTANEN    CANCELLED 
353      1220 1555       DSS-13  GSSR   AST 2003 SD220
354 0635 0805 1235 1305  DSS-14  GSSR   COMET WIRTANEN    CANCELLED
354 1130 1300 1530 1600  DSS-14  GSSR   AST 2003 SD220 
354      1335 1830       DSS-13  GSSR   AST 2003 SD220    DSS-13 track runs longer than DSS-14 track: request GBT
354 2345 0000 0330 0400  DSS-43  GSSR   AST 2003 SD220        AUSTRALIA
355 0635 0805 1245 1315  DSS-14  GSSR   COMET WIRTANEN   CANCELLED
355      1400 1845       DSS-13  GSSR   AST 2003 SD220    Not scheduled at DSS-14 on this date:       request GBT
355 2015 2100 0315 0355  DSS-35  GSSR   AST 2003 SD220        AUSTRALIA
356 1305 1435 1635 1705  DSS-14  GSSR   AST 2003 SD220 
356      1450 1840       DSS-13  GSSR   AST 2003 SD220    DSS-13 track runs longer than DSS-14 track: request GBT
356 2205 2250 0240 0300  DSS-36  GSSR   AST 2003 SD220        AUSTRALIA
357      1640 1940       DSS-13  GSSR   AST 2003 SD220    Not scheduled at DSS-14 on this date:       request GBT
360 1625 1755 1955 2025  DSS-14  GSSR   AST 2003 SD220    
360      1755 1955       DSS-13  GSSR   AST 2003 SD220    Receive only

Goldstone tracks:
     UT                   UT          PST                 Duration Round-trip  
DOY  Date                 TX Window   TX Window           hh:mm    time (sec)   Observer
328  Nov 24  2003 SD220   1445-1705   0645-0905 Nov 24     2:20     96           LB     Not observed
328  Nov 24  2007 EJ      1545-1705   0745-0905 Nov 24     1:20     63                  Detected

330  Nov 26  2003 SD220   1335-1700   0535-0900 Nov 26     3:25     90           MB     1.0 usec image
330  Nov 26  2007 EJ      1435-1700   0635-0900 Nov 26     2:25     67                  Detected

331  Nov 27  2003 SD220   1310-1530   0510-0730 Nov 27     2:20     87           SN     0.5 usec image
331  Nov 27  2007 EJ      1410-1530   0610-0730 Nov 27     1:20     70                  Detected

333  Nov 29  2003 SD220   1220-1650   0420-0850 Nov 29     4:30     80           SN     0.25 usec image
333  Nov 29  2007 EJ      1320-1650   0520-0850 Nov 29     3:30     77                  Not observed

341  Dec  7  Comet 46P    0720-0935   2320-0135 Dec  6-7   2:15     95           MB     Not observed due to equipment problems
341  Dec  7  2003 SD220   0820-1315   0020-0515 Dec  7     4:55     54                  Not observed due to equipment problems

342  Dec  8  Comet 46P    0725-0945   2325-0145 Dec  7-8   2:20     92           LB     Not observed due to equipment problems
342  Dec  8  2003 SD220   0825-1310   0025-0510 Dec  8     4:45     51                  1/8 usec image

343  Dec  9  Comet 46P    0735-0955   2335-0155 Dec  8-9   2:20     89           MB     Not detected
343  Dec  9  2003 SD220   0835-1305   0035-0505 Dec  9     4:30     48                  0.05 usec image

344  Dec 10  2003 SD220   0845 1250   0045-0450 Dec 10     4:05     45           LB     0.05 usec image

345  Dec 11  2003 SD220   0855 1325   0055-0525 Dec 11     4:30     41           SN     0.05 usec image                  

346  Dec 12  2003 SD220   1030 1300   0230-0500 Dec 12     2:30     38           SN     0.025 usec image

347  Dec 13  2003 SD220   1030 1250   0230-0450 Dec 13     2:20     35           SN     0.025 usec image

349  Dec 15  2003 SD220   1010 1240   0210-0440 Dec 15     2:30     30           MB     GBT scheduled

350  Dec 16  2003 SD220   1035 1240   0235-0440 Dec 16     2:05     27           MB     GBT scheduled

351  Dec 17  2003 SD220   1105 1305   0305-0505 Dec 17     2:00     24           MB     GBT scheduled.  Bistatic w/Sardinia Deep Space Antenna (SDSA): 1253-1305 UT.  Medicina also.
351  Dec 17  Comet 46P    1105 1147   0305-0347 Dec 17     0:42     78           MB

352  Dec 18  2003 SD220   1140 1305   0340-0505 Dec 18     1:25     22           LB
352  Dec 18  2003 SD220   1140 1510   0340-0710 Dec 18     3:30     22   DSS-13  LB     GBT scheduled.     AO: 1327-1509
352  Dec 18  Comet 46P    1140 1203   0340-0403 Dec 18     0:23     78           LB

353  Dec 19  2003 SD220   1220 1555   0420-0755 Dec 19     3:35     21   DSS-13  LB     GBT scheduled.     AO: 1324-1555

354  Dec 20  2003 SD220   1300 1530   0500-0730 Dec 20     2:30     19           LB            Bistatic with SDSA: 1315-1335 UT    Medicina also. Possibly ATCA.
354  Dec 20  2003 SD220   1335 1830   0535-1030 Dec 20     4:55     19   DSS-13  LB     GBT scheduled.     AO: 1337-1625

355  Dec 21  2003 SD220   1400 1845   0600 1045 DEc 21     4:45     19   DSS-13  SN     GBT scheduled.     AO: 1404-1640

356  Dec 22  2003 SD220   1435 1635   0635-0835 Dec 22     2:00     19           SN            Bistatic with SDSA: 1440-1500 UT    Medicina also
356  Dec 22  2003 SD220   1450 1840   0650-1040 Dec 22     3:50     19   DSS-13  SN     GBT scheduled.     AO: 1453-1631

357  Dec 23  2003 SD220   1640 1940   0840-1140 Dec 23     3:00     20   DSS-13  SN     GBT scheduled.     AO: no overlap

360  Dec 26  2003 SD220   1755 1955   0955-1155 Dec 26     2:00     26           MB
360  Dec 26  2003 SD220   1755 1955   0955-1155 Dec 26     2:00     26   DSS-13  MB     Receive only: no DSS-13 transmissions.

Canberra/ATCA tracks (transmit times; ignores set up times)
355      Dec 20-21  2003 SD220  0000 0330   DSS-43     70 m
355-356  Dec 21-22  2003 SD220  2100 0315   DSS-35     34 m
356-357  Dec 22-23  2003 SD220  2250 0240   DSS-36     34 m
There is no overlap between tracks at DSS-14 and Canberra.

For many of the Comet Wirtanen tracks, 433 Eros is also observable and close enough to 
detect during the tracks we have scheduled.



Arecibo tracks:
UT                     UT            Round-trip  
Date                   TX Window     time (sec)  
Aug 25    2003 SD220   1610-1756     241 
                                    
Nov 30    2007 EJ      1317-1457      80
Dec 01    2007 EJ      1255-1455      85
Dec 11    Comet 46P    0138-0316
Dec 12    ...not scheduled...
Dec 13    Comet 46P    0120-0346
Dec 14    Comet 46P    0117-0355
Dec 15    Comet 46P    0118-0403
Dec 16    Comet 46P    0121-0408
Dec 17    Comet 46P    0129-0411
Dec 18    2003 SD220   1327-1509                Receive at GBT
Ded 18    Comet 46P    0140-0411
Dec 19    2003 SD220   1324-1555                Receive at GBT.  Includes radar speckle with the VLBA
Dec 20    2003 SD220   1337-1625                Receive at GBT.
Dec 21    2003 SD220   1404-1640                Receive at GBT.  Includes radar speckle with the VLBA
Dec 22    2003 SD220   1453-1631                Receive at GBT.



Uncertainties


2003 SD220
JPL/Horizons solution 85, # obs: 478 (2000-2018):
2018 Nov 14
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2018-Nov-22 00:00 *   170.45967  56.18270 0.10410210152371      0.692        0.10        0.38       0.000229
 2018-Nov-24 00:00 *   172.02960  56.12838 0.09794697804109      0.734        0.11        0.39       0.000225
 2018-Nov-26 00:00 *   173.76593  56.05685 0.09170450916054      0.784        0.11        0.39       0.000221
 2018-Nov-28 00:00 *   175.70732  55.96140 0.08538407850591      0.844        0.11        0.40       0.000217
 2018-Nov-30 00:00 *   177.90326  55.83154 0.07899702892751      0.914        0.11        0.41       0.000213
 2018-Dec-02 00:00 *   180.41882  55.65013 0.07255753512448      0.999        0.12        0.42       0.000210
 2018-Dec-04 00:00 *   183.34148  55.38896 0.06608342050794      1.102        0.12        0.43       0.000207
 2018-Dec-06 00:00 *   186.79026  55.00114 0.05959739744934      1.228        0.12        0.45       0.000205
 2018-Dec-08 00:00 *m  190.92705  54.40746 0.05312945440565      1.386        0.13        0.47       0.000203
 2018-Dec-10 00:00 *m  195.96878  53.47089 0.04672158780041      1.585        0.14        0.51       0.000203
 2018-Dec-12 00:00 *m  202.19339  51.94811 0.04043721817605      1.841        0.15        0.56       0.000204
 2018-Dec-14 00:00 *m  209.91993  49.39836 0.03438013875050      2.175        0.17        0.63       0.000206
 2018-Dec-16 00:00 *m  219.42052  45.02851 0.02873301263238      2.615        0.20        0.72       0.000209
 2018-Dec-18 00:00 *m  230.71349  37.52381 0.02383210928462      3.178        0.23        0.83       0.000211
 2018-Dec-20 00:00 *m  243.28836  25.31400 0.02027511422874      3.815        0.34        1.24       0.000205
 2018-Dec-22 00:00 *   256.06163   8.48803 0.01889044365821      4.283        0.59        2.16       0.000181
 2018-Dec-24 00:00 *   267.82942  -8.90544 0.02018053792246      4.226        0.68        2.48       0.000141
 2018-Dec-26 00:00 *   277.84443 -22.42929 0.02375598284950      3.726        0.53        1.93       0.000105
 2018-Dec-28 00:00 *   285.95211 -31.43704 0.02881441903394      3.143        0.35        1.26       0.000086


Comet Wirtanen
JPL/Horizons solution 181/3,  data arc: 2018-05-08 to 2018-11-26
2018 Dec 04
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2018-Dec-05 00:00 *    42.16797 -12.94372 0.10359674728553      3.827        5.38       19.54       0.009337
 2018-Dec-06 00:00 *    43.22386 -10.84549 0.09978572103696      4.695        5.00       18.18       0.009505
 2018-Dec-07 00:00 *m   44.36126  -8.56210 0.09617517813564      5.722        4.51       16.40       0.009655
 2018-Dec-08 00:00 *m   45.58624  -6.08415 0.09279136925994      6.926        3.91       14.20       0.009782
 2018-Dec-09 00:00 *m   46.90517  -3.40508 0.08966290367744      8.320        3.22       11.69       0.009880
 2018-Dec-10 00:00 *m   48.32466  -0.52256 0.08682040743877      9.913        2.58        9.39       0.009939
 2018-Dec-11 00:00 *m   49.85146   2.55993 0.08429590511989     11.701        2.40        8.71       0.009954
 2018-Dec-12 00:00 *m   51.49235   5.83149 0.08212187383097     13.670        3.06       11.13       0.009915
 2018-Dec-13 00:00 *m   53.25397   9.27240 0.08032995283686     15.788        4.41       16.02       0.009817
 2018-Dec-14 00:00 *m   55.14261  12.85328 0.07894935202271     18.006        6.11       22.20       0.009652
 2018-Dec-15 00:00 *m   57.16390  16.53511 0.07800508240515     20.260        7.96       28.94       0.009419
 2018-Dec-16 00:00 *m   59.32243  20.27046 0.07751621363901     22.472        9.82       35.69       0.009117
 2018-Dec-17 00:00 *m   61.62137  24.00595 0.07749441701488     24.565       11.56       42.03       0.008750
 2018-Dec-18 00:00 *m   64.06194  27.68570 0.07794304696442     26.465       13.08       47.54       0.008324
 2018-Dec-19 00:00 *m   66.64288  31.25528 0.07885693561011     28.112       14.30       51.96       0.007851
 2018-Dec-20 00:00 *m   69.35992  34.66545 0.08022293974069     29.469       15.16       55.10       0.007343
 2018-Dec-21 00:00 *m   72.20527  37.87518 0.08202113136853     30.520       15.66       56.93       0.006812
 2018-Dec-22 00:00 *    75.16730  40.85344 0.08422641170036     31.271       15.82       57.51       0.006273
Pointing has gotten worse, perhaps due to non-gravitational perturbations.

JPL/Horizons solution 182/10, data arc: 2013-10-30 to 2018-11-14:
2018 Nov 14
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2018-Dec-05 00:00 *    42.16839 -12.94457 0.10360169299024      5.433        4.42       16.05       0.007020
 2018-Dec-06 00:00 *    43.22428 -10.84650 0.09979078634102      6.113        4.80       17.44       0.006978
 2018-Dec-07 00:00 *m   44.36167  -8.56330 0.09618034935066      6.874        5.26       19.10       0.006921 *
 2018-Dec-08 00:00 *m   45.58663  -6.08557 0.09279662902014      7.721        5.79       21.05       0.006847 *
 2018-Dec-09 00:00 *m   46.90554  -3.40674 0.08966823040700      8.653        6.42       23.33       0.006752 * 
 2018-Dec-10 00:00 *m   48.32498  -0.52451 0.08682577490880      9.665        7.13       25.93       0.006634
 2018-Dec-11 00:00 *m   49.85172   2.55767 0.08430128219401     10.746        7.93       28.82       0.006492
 2018-Dec-12 00:00 *m   51.49254   5.82889 0.08212722451998     11.876        8.79       31.95       0.006322 *
 2018-Dec-13 00:00 *m   53.25408   9.26944 0.08033523678569     13.027        9.69       35.20       0.006126 *
 2018-Dec-14 00:00 *m   55.14261  12.84996 0.07895452552315     14.164       10.57       38.42       0.005904 *
 2018-Dec-15 00:00 *m   57.16376  16.53142 0.07801009995482     15.247       11.40       41.42       0.005658 *
 2018-Dec-16 00:00 *m   59.32213  20.26641 0.07752102995762     16.234       12.11       44.00       0.005395 *
 2018-Dec-17 00:00 *m   61.62088  24.00158 0.07749898930693     17.085       12.65       45.98       0.005121 *
 2018-Dec-18 00:00 *m   64.06122  27.68104 0.07794733712736     17.772       12.99       47.22       0.004846 *
 2018-Dec-19 00:00 *m   66.64190  31.25038 0.07886091206875     18.276       13.11       47.65       0.004579 *
 2018-Dec-20 00:00 *m   69.35864  34.66038 0.08022657865807     18.592       13.01       47.27       0.004330 *
 2018-Dec-21 00:00 *m   72.20367  37.86999 0.08202441711863     18.729       12.70       46.15       0.004108 *
 2018-Dec-22 00:00 *    75.16534  40.84820 0.08422933663850     18.706       12.22       44.42       0.003920


 2007 EJ
JPL/Horizons solution 92, # obs: 328 (2007-2018)
2018 Nov 14
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2018-Nov-17 00:00 *m  268.11361 -42.55821 0.07062981842003      2.129        1.55        5.62       0.000489
 2018-Nov-18 00:00 *m  262.95701 -40.33979 0.06778869953152      2.320        1.78        6.46       0.000435
 2018-Nov-19 00:00 *m  257.74293 -37.68910 0.06541778459327      2.503        2.00        7.28       0.000375
 2018-Nov-20 00:00 *m  252.56817 -34.61248 0.06357817612716      2.664        2.21        8.01       0.000310
 2018-Nov-21 00:00 *m  247.52634 -31.15106 0.06232431142898      2.789        2.36        8.59       0.000245
 2018-Nov-22 00:00 *   242.69853 -27.38171 0.06169795516074      2.863        2.45        8.92       0.000190
 2018-Nov-23 00:00 *   238.14693 -23.41041 0.06172273747272      2.879        2.47        8.97       0.000162
 2018-Nov-24 00:00 *   233.91234 -19.35858 0.06240075520318      2.835        2.40        8.72       0.000178
 2018-Nov-25 00:00 *   230.01518 -15.34618 0.06371232361325      2.737        2.26        8.22       0.000225
 2018-Nov-26 00:00 *   226.45883 -11.47656 0.06561895486106      2.597        2.07        7.54       0.000284
 2018-Nov-27 00:00 *   223.23387  -7.82705 0.06806858673323      2.429        1.86        6.76       0.000344
 2018-Nov-28 00:00 *   220.32235  -4.44635 0.07100156358471      2.247        1.64        5.94       0.000401
 2018-Nov-29 00:00 *   217.70132  -1.35730 0.07435603829123      2.062        1.42        5.15       0.000451
 2018-Nov-30 00:00 *   215.34560   1.43740 0.07807203936458      1.882        1.22        4.42       0.000496
 2018-Dec-01 00:00 *   213.22963   3.94891 0.08209403923020      1.713        1.04        3.76       0.000534
 2018-Dec-02 00:00 *   211.32871   6.19670 0.08637223989363      1.557        0.88        3.18       0.000567
 2018-Dec-03 00:00 *   209.61973   8.20434 0.09086293629027      1.415        0.74        2.69       0.000596
 2018-Dec-04 00:00 *   208.08148   9.99660 0.09552830549148      1.288        0.62        2.26       0.000620
 2018-Dec-05 00:00 *   206.69479  11.59768 0.10033589076057      1.175        0.52        1.89       0.000640


Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination: 2003 SD220 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-O-T /r T-O-M/Illu% 2018-Nov-10 00:00 163.22590 56.35144 0.13872889488902 15.89 89.6700 /L 106.6/ 6.0 2018-Nov-12 00:00 164.25406 56.33636 0.13327864657585 15.78 90.6124 /L 122.4/ 18.4 2018-Nov-14 00:00 165.34070 56.31901 0.12768812957887 15.67 91.5166 /L 133.4/ 35.1 2018-Nov-16 00:00 166.49412 56.29847 0.12196686673891 15.55 92.3770 /L 136.6/ 53.7 2018-Nov-18 00:00 167.72545 56.27337 0.11612406553654 15.43 93.1867 /L 130.5/ 72.1 2018-Nov-20 00:00 169.04932 56.24180 0.11016862874707 15.30 93.9364 /L 117.2/ 87.9 2018-Nov-22 00:00 170.48471 56.20119 0.10410912965066 15.16 94.6147 /L 99.9/ 97.9 2018-Nov-24 00:00 172.05600 56.14812 0.09795387820391 15.02 95.2070 /L 80.8/ 99.1 2018-Nov-26 00:00 173.79396 56.07800 0.09171131203228 14.87 95.6949 /L 62.7/ 90.1 2018-Nov-28 00:00 175.73733 55.98414 0.08539081989612 14.72 96.0552 /L 49.4/ 72.4 2018-Nov-30 00:00 177.93570 55.85607 0.07900375086895 14.55 96.2571 /L 46.1/ 50.3 2018-Dec-02 00:00 180.45429 55.67670 0.07256428723759 14.38 96.2588 /L 53.6/ 28.6 2018-Dec-04 00:00 183.38077 55.41786 0.06609026196668 14.19 96.0013 /L 67.2/ 11.6 2018-Dec-06 00:00 186.83439 55.03271 0.05960439991236 14.00 95.3993 /L 82.4/ 1.9 2018-Dec-08 00:00 190.97740 54.44206 0.05313670632654 13.80 94.3256 /L 96.9/ 0.5 2018-Dec-10 00:00 196.02709 53.50893 0.04672920048526 13.59 92.5858 /L 109.1/ 6.9 2018-Dec-12 00:00 202.26175 51.98992 0.04044533326649 13.39 89.8725 /L 118.3/ 19.4 2018-Dec-14 00:00 210.00038 49.44421 0.03438893348538 13.22 85.6866 /L 124.1/ 36.1 2018-Dec-16 00:00 219.51399 45.07857 0.02874268609227 13.13 79.2112 /L 127.5/ 55.1 2018-Dec-18 00:00 230.81794 37.57862 0.02384278907643 13.27 69.1908 /L 131.3/ 74.1 2018-Dec-20 00:00 243.39733 25.37559 0.02028654214113 14. 54.2440 /L 139.1/ 90.1 2018-Dec-22 00:00 256.16604 8.55843 0.01890151362759 16. 34.7645 /L 151.4/ 99.2 2018-Dec-24 00:00 267.92214 -8.83064 0.02018977541409 22. 15.1766 /L 154.5/ 97.7 2018-Dec-26 00:00 277.92297 -22.35826 0.02376285550972 42. 3.3008 /T 138.1/ 85.4 2018-Dec-28 00:00 286.01747 -31.37381 0.02881925339962 25. 11.5396 /T 116.0/ 65.6 2018-Dec-30 00:00 292.41197 -37.16175 0.03474948416742 21. 18.1523 /T 93.8/ 43.5 Comet Wirtanen Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta T-mag N-mag S-O-T /r T-O-M/Illu% 2018-Nov-02 00:00 30.22705 -32.98497 0.26868014179662 11.80 n.a. 131.9076 /T 122.4/ 35.4 2018-Nov-04 00:00 30.34178 -33.01985 0.25766795466593 11.65 n.a. 130.9815 /T 138.6/ 15.9 2018-Nov-06 00:00 30.48516 -32.97405 0.24679174019796 11.49 n.a. 130.0987 /T 142.1/ 3.5 2018-Nov-08 00:00 30.66472 -32.83911 0.23603706943864 11.34 n.a. 129.2719 /T 131.0/ 0.3 2018-Nov-10 00:00 30.88867 -32.60563 0.22539089063189 11.18 n.a. 128.5147 /T 113.4/ 6.0 2018-Nov-12 00:00 31.16577 -32.26298 0.21484240988570 11.03 n.a. 127.8418 /T 94.4/ 18.4 2018-Nov-14 00:00 31.50533 -31.79882 0.20438407309654 10.87 n.a. 127.2696 /T 75.7/ 35.1 2018-Nov-16 00:00 31.91731 -31.19856 0.19401245803183 10.71 n.a. 126.8165 /T 58.0/ 53.7 2018-Nov-18 00:00 32.41251 -30.44456 0.18372911474108 10.54 n.a. 126.5035 /T 42.9/ 72.1 2018-Nov-20 00:00 33.00274 -29.51537 0.17354153799290 10.38 n.a. 126.3554 /T 34.9/ 87.9 2018-Nov-22 00:00 33.70099 -28.38450 0.16346447873356 10.21 n.a. 126.4010 /T 40.6/ 97.9 2018-Nov-24 00:00 34.52180 -27.01910 0.15352172680661 10.03 n.a. 126.6751 /T 57.5/ 99.1 2018-Nov-26 00:00 35.48172 -25.37818 0.14374832137265 9.86 n.a. 127.2193 /T 79.1/ 90.1 2018-Nov-28 00:00 36.60017 -23.41075 0.13419303923896 9.68 n.a. 128.0843 /T 102.1/ 72.4 2018-Nov-30 00:00 37.90036 -21.05399 0.12492128537668 9.49 n.a. 129.3302 /T 124.4/ 50.3 2018-Dec-02 00:00 39.41022 -18.23227 0.11601891931945 9.31 n.a. 131.0274 /T 144.2/ 28.6 2018-Dec-04 00:00 41.16295 -14.85776 0.10759740246497 9.13 n.a. 133.2533 /T 155.9/ 11.6 2018-Dec-06 00:00 43.19736 -10.83513 0.09979988479779 8.95 n.a. 136.0835 /T 150.2/ 1.9 2018-Dec-08 00:00 45.55796 -6.07379 0.09280667116509 8.78 n.a. 139.5725 /T 134.3/ 0.5 2018-Dec-10 00:00 48.29439 -0.51253 0.08683664189363 8.63 n.a. 143.7135 /T 116.3/ 6.9 2018-Dec-12 00:00 51.45989 5.84085 0.08213871925648 8.50 n.a. 148.3703 /T 98.1/ 19.4 2018-Dec-14 00:00 55.10778 12.86168 0.07896636193315 8.42 n.a. 153.1738 /T 80.0/ 36.1 2018-Dec-16 00:00 59.28511 20.27781 0.07753284963670 8.38 n.a. 157.4096 /T 61.8/ 55.1 2018-Dec-18 00:00 64.02214 27.69218 0.07795876140488 8.40 n.a. 160.0513 /T 43.7/ 74.1 2018-Dec-20 00:00 69.31781 34.67150 0.08023727937285 8.47 n.a. 160.3262 /T 27.2/ 90.1 2018-Dec-22 00:00 75.12334 40.85960 0.08423909056476 8.60 n.a. 158.5317 /T 21.3/ 99.2 2018-Dec-24 00:00 81.32974 46.05069 0.08975346675907 8.75 n.a. 155.6952 /T 34.5/ 97.7 2018-Dec-26 00:00 87.76812 50.19495 0.09654054646259 8.94 n.a. 152.6636 /T 54.5/ 85.4 2018-Dec-28 00:00 94.22873 53.35857 0.10437165657935 9.13 n.a. 149.8727 /T 75.1/ 65.6 2018-Dec-30 00:00 100.49540 55.67249 0.11305020235433 9.34 n.a. 147.4877 /L 94.6/ 43.5 2019-Jan-01 00:00 106.38259 57.29036 0.12241741768263 9.54 n.a. 145.5387 /L 112.4/ 23.6 2019-Jan-03 00:00 111.76048 58.36096 0.13234996884901 9.75 n.a. 143.9976 /L 127.8/ 8.9 2019-Jan-05 00:00 116.56157 59.01384 0.14275445140714 9.95 n.a. 142.8152 /L 138.6/ 1.1 2019-Jan-07 00:00 120.77199 59.35416 0.15356144266400 10.16 n.a. 141.9383 /L 141.4/ 0.8 2019-Jan-09 00:00 124.41584 59.46333 0.16472024099219 10.35 n.a. 141.3166 /L 135.1/ 7.6 2019-Jan-11 00:00 127.53938 59.40234 0.17619461485647 10.55 n.a. 140.9051 /L 122.5/ 20.4 2019-Jan-13 00:00 130.19879 59.21591 0.18795950124899 10.74 n.a. 140.6649 /L 106.6/ 37.6 2019-Jan-15 00:00 132.45215 58.93637 0.19999845822769 10.93 n.a. 140.5621 /L 88.6/ 57.4 2007 EJ Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-brt S-O-T /r T-O-M/Illu% 2018-Nov-10 00:00 297.30554 -49.14223 0.09896182399025 17.08 6.43 65.6270 /T 45.3/ 6.0 2018-Nov-11 00:00 294.05926 -48.82603 0.09433223893241 17.17 6.53 62.6164 /T 35.0/ 11.5 2018-Nov-12 00:00 290.50442 -48.37127 0.08983522392656 17.30 6.66 59.3642 /T 28.0/ 18.4 2018-Nov-13 00:00 286.62849 -47.74089 0.08550208633007 17.47 6.81 55.8397 /T 27.4/ 26.4 2018-Nov-14 00:00 282.42989 -46.89130 0.08136960731401 18. 7. 52.0108 /T 33.6/ 35.1 2018-Nov-15 00:00 277.92237 -45.77338 0.07748058392056 18. 7. 47.8456 /T 44.1/ 44.3 2018-Nov-16 00:00 273.13883 -44.33524 0.07388409642898 18. 8. 43.3157 /T 56.9/ 53.7 2018-Nov-17 00:00 268.13338 -42.52712 0.07063524329453 19. 8. 38.4003 /T 71.0/ 63.1 2018-Nov-18 00:00 262.98036 -40.30875 0.06779400161966 20. 8. 33.0924 /T 86.3/ 72.1 2018-Nov-19 00:00 257.76943 -37.65848 0.06542284434031 21. 9. 27.4058 /T 102.5/ 80.5 2018-Nov-20 00:00 252.59722 -34.58266 0.06358286255062 22. 10. 21.3844 /T 119.5/ 87.9 2018-Nov-21 00:00 247.55724 -31.12234 0.06232848902385 24. 12. 15.1126 /T 137.2/ 93.8 2018-Nov-22 00:00 242.73055 -27.35431 0.06170149353167 30. 16. 8.7558 /T 155.3/ 97.9 2018-Nov-23 00:00 238.17939 -23.38443 0.06172552203932 46. 30. 3.1172 /L 171.7/ 99.8 2018-Nov-24 00:00 233.94466 -19.33404 0.06240269646392 36. 21. 5.3770 /L 164.1/ 99.1 2018-Nov-25 00:00 230.04689 -15.32301 0.06371336262414 27. 14. 11.3653 /L 145.7/ 95.9 2018-Nov-26 00:00 226.48959 -11.45465 0.06561906385944 24. 11. 17.3262 /L 126.8/ 90.1 2018-Nov-27 00:00 223.26344 -7.80628 0.06806776549580 22. 10. 22.9918 /L 108.2/ 82.1 2018-Nov-28 00:00 220.35060 -4.42658 0.07099983322702 21. 9. 28.2889 /L 90.0/ 72.4 2018-Nov-29 00:00 217.72819 -1.33842 0.07435343439488 20. 8. 33.1944 /L 72.3/ 61.6 2018-Nov-30 00:00 215.37106 1.45549 0.07806860580561 19. 8. 37.7117 /L 55.4/ 50.3 2018-Dec-01 00:00 213.25371 3.96629 0.08208982337175 19. 8. 41.8601 /L 39.4/ 39.1 2018-Dec-02 00:00 211.35146 6.21343 0.08636728924431 18. 7. 45.6672 /L 24.9/ 28.6 2018-Dec-03 00:00 209.64120 8.22048 0.09085729642068 18. 7. 49.1647 /L 15.0/ 19.3 2018-Dec-04 00:00 208.10174 10.01221 0.09552201889765 18. 7. 52.3848 /L 17.9/ 11.6 2018-Dec-05 00:00 206.71391 11.61278 0.10032899637573 17.76 6.77 55.3585 /L 29.3/ 5.8 2018-Dec-06 00:00 205.46055 13.04479 0.10525049417424 17.64 6.65 58.1144 /L 42.5/ 1.9 2018-Dec-07 00:00 204.32639 14.32873 0.11026284699478 17.55 6.54 60.6785 /L 55.9/ 0.2 2018-Dec-08 00:00 203.29788 15.48291 0.11534584502143 17.48 6.45 63.0739 /L 69.1/ 0.5 2018-Dec-09 00:00 202.36303 16.52346 0.12048218926098 17.42 6.37 65.3211 /L 82.0/ 2.8 2018-Dec-10 00:00 201.51122 17.46450 0.12565702449578 17.38 6.30 67.4379 /L 94.6/ 6.9 2018-Dec-11 00:00 200.73307 18.31837 0.13085754795667 17.35 6.24 69.4402 /L 106.8/ 12.5 2018-Dec-12 00:00 200.02026 19.09577 0.13607268653008 17.33 6.18 71.3417 /L 118.7/ 19.4 2018-Dec-13 00:00 199.36538 19.80604 0.14129283298559 17.31 6.13 73.1543 /L 130.1/ 27.3 2018-Dec-14 00:00 198.76185 20.45729 0.14650963116343 17.30 6.09 74.8886 /L 140.8/ 36.1 2018-Dec-15 00:00 198.20381 21.05657 0.15171580056023 17.29 6.05 76.5538 /L 150.2/ 45.4

Setups



2007 EJ
We are expecting a bandwidth of about 20 Hz for 2007 EJ, but we expect relatively modest SNRs,
so we're going to adopt an intial CW setup with a frequency resolution of 5 Hz so we can 
see an echo quickly. 


2003 SD220
This object is going to have a narrow bandwidth due to its extremely slow rotation.  
The bandwidth will barely change during individual tracks but could vary by more than 
a factor of two over several days due to the elongated shape and if this asteroid is
in a non-principal axis spin state, which seems likely. 

Comet Wirtanen
We're going to use a wider than usual CW bandwidth for the comet in order to 
detect echoes from the coma, which could span more than 1000 Hz.

The echo from the nucleus could have a bandwidth close to 20 Hz.


CW setup for 2003 SD220
TX polarization           RCP
RCV polarization          LCP & RCP
Frequency hops:           no hopping
Bandwidth:               5000 Hz 
TXoffset                  +500 Hz
FFT                      1000 for 5 Hz resolution 

CW setup for Comet Wirtanen
TX polarization           RCP
RCV polarization          LCP & RCP
Frequency hops:           no hopping
Bandwidth:               20,000 Hz
TXoffset                  +500 Hz
FFT                       1000 for 20 Hz resolution



Ranging setups:
---------------------------------------------------------------------------
10-usec
baud             10 usec
code            127
PRP            1270 usec
FFT             128   
ncoh              1 
bandwidth       787 Hz   
resolution      12.3 Hz
TXOFF          +100Hz  (echo in bin 32 + 8 = 40)
---------------------------------------------------------------------------
11-usec 
baud             11 usec
code            127
PRP            1397 usec
FFT              64  
ncoh              1 
bandwidth       716 Hz   
resolution      11.2 Hz
TXOFF          +100 Hz  (echo in bin 32 + 9= 41) 
-------------------------------------------------------------------------
1-usec 
baud            1 usec
code            255
FFT             512
ncoh             16
bandwidth        245 Hz   
resolution       0.48 Hz
TXOFF           +50 Hz 
---------------------------------------------------------------------

Instructions

NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/2003sd220/raw/

POINTING:

  OSOD and predicts will be on aardvark:

...not available yet...


POINTING  
                                                          TX Offsets    
Date (UTC)   DOY  hhmmss    RA        Dec         Macro   LHA     Dec    RTT    OSOD

... to be added ...

Transmit offsets are given in millidegrees.  


PRDX.OUT.14f-14-14.?? TRANSMITTER: STATION #14, RECEIVER: STATION #14 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL

2003 SD220 GOLDSTONE MASTERLOG

============================================================================== Receive TX Setup hops dwell code ncoh FFT runs start -stop OSOD offset Poln Notes ------------------------------------------------------------------------------
Ephemerides for DSS-43 on DOY 354, 355, and 356 Horizons = 20 degrees RA and DEC are in degrees. Delta is the distance in au. Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta DOY 353-354 2018-Dec-19 22:00 *r 242.92375 26.08620 0.02038254365024 2018-Dec-19 22:30 * 243.04599 25.93655 0.02035230417561 2018-Dec-19 23:00 * 243.16740 25.78569 0.02032275346178 2018-Dec-19 23:30 * 243.28819 25.63360 0.02029392214881 2018-Dec-20 00:00 * 243.40859 25.48027 0.02026583287483 2018-Dec-20 00:30 *t 243.52881 25.32567 0.02023849988881 2018-Dec-20 01:00 * 243.64910 25.16983 0.02021192880420 2018-Dec-20 01:30 * 243.76969 25.01277 0.02018611649830 2018-Dec-20 02:00 * 243.89080 24.85451 0.02016105115948 2018-Dec-20 02:30 * 244.01266 24.69509 0.02013671248185 DOY 354-355 2018-Dec-20 22:00 *r 249.37497 18.18057 0.01931672720740 2018-Dec-20 22:30 * 249.49756 18.00715 0.01929838161715 2018-Dec-20 23:00 * 249.61910 17.83286 0.01928076805543 2018-Dec-20 23:30 * 249.73980 17.65768 0.01926392414226 2018-Dec-21 00:00 * 249.85988 17.48160 0.01924787936079 2018-Dec-21 00:30 * 249.97955 17.30463 0.01923265455176 2018-Dec-21 01:00 *t 250.09905 17.12677 0.01921826155350 2018-Dec-21 01:30 * 250.21861 16.94805 0.01920470299394 2018-Dec-21 02:00 * 250.33846 16.76849 0.01919197223903 2018-Dec-21 02:30 * 250.45883 16.58812 0.01918005349849 2018-Dec-21 03:00 * 250.57992 16.40700 0.01916892208761 2018-Dec-21 03:30 * 250.70195 16.22517 0.01915854484041 2018-Dec-21 04:00 * 250.82509 16.04268 0.01914888066732 DOY 355-356 2018-Dec-21 21:30 *r 255.60302 9.58132 0.01889217604110 2018-Dec-21 22:00 * 255.72420 9.39522 0.01888671228613 2018-Dec-21 22:30 * 255.84399 9.20877 0.01888193935695 2018-Dec-21 23:00 * 255.96256 9.02195 0.01887790818932 2018-Dec-21 23:30 * 256.08009 8.83477 0.01887466238298 2018-Dec-22 00:00 * 256.19679 8.64723 0.01887223745442 2018-Dec-22 00:30 * 256.31287 8.45934 0.01887066022523 2018-Dec-22 01:00 * 256.42856 8.27112 0.01886994835714 2018-Dec-22 01:30 *t 256.54409 8.08258 0.01887011004224 2018-Dec-22 02:00 * 256.65968 7.89377 0.01887114385435 2018-Dec-22 02:30 * 256.77555 7.70469 0.01887303876418 2018-Dec-22 03:00 * 256.89194 7.51539 0.01887577431843 2018-Dec-22 03:30 * 257.00904 7.32590 0.01887932097954 2018-Dec-22 04:00 * 257.12705 7.13626 0.01888364062018 2018-Dec-22 04:30 * 257.24614 6.94650 0.01888868716374 2018-Dec-22 05:00 * 257.36647 6.75667 0.01889440735931 DOY 356-357 2018-Dec-22 21:30 *r 261.70527 0.57759 0.01913334789343 2018-Dec-22 22:00 * 261.82106 0.39302 0.01914190733927 2018-Dec-22 22:30 * 261.93534 0.20860 0.01915111899595 2018-Dec-22 23:00 * 262.04826 0.02436 0.01916103800028 2018-Dec-22 23:30 * 262.15999 -0.15970 0.01917171251858 2018-Dec-23 00:00 * 262.27073 -0.34356 0.01918318291850 2018-Dec-23 00:30 * 262.38067 -0.52718 0.01919548107211 2018-Dec-23 01:00 * 262.49004 -0.71055 0.01920862980274 2018-Dec-23 01:30 * 262.59904 -0.89365 0.01922264248566 2018-Dec-23 02:00 *t 262.70790 -1.07645 0.01923752280975 2018-Dec-23 02:30 * 262.81685 -1.25893 0.01925326470451 2018-Dec-23 03:00 * 262.92611 -1.44107 0.01926985243382 2018-Dec-23 03:30 * 263.03587 -1.62285 0.01928726085458 2018-Dec-23 04:00 * 263.14635 -1.80426 0.01930545583566 2018-Dec-23 04:30 * 263.25772 -1.98528 0.01932439482954 2018-Dec-23 05:00 * 263.37015 -2.16589 0.01934402758625 2018-Dec-23 05:30 * 263.48377 -2.34609 0.01936429699691 2018-Dec-23 06:00 * 263.59872 -2.52587 0.01938514005173
Dr. Lance A. M. Benner | PHONE: (818) 354-7412 Mail Stop 183-601 | FAX: (818) 393-4445 Jet Propulsion Laboratory | email: lance.benner@jpl.nasa.gov California Institute of Technology | Plan: To live long and prosper Pasadena, CA 91109-8099 http://echo.jpl.nasa.gov/asteroids/2003SD220/2003SD220_planning.2018.html

Asteroid Radar Astronomy
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