Goldstone Radar Observations Planning: (163899) 2003 SD220, 2007 EJ, and Comet 46P/Wirtanen
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
2003 SD220 https://minorplanetcenter.net/mpec/K03/K03S91.html 2007 EJ https://www.minorplanetcenter.net/mpec/K07/K07E35.html
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