Goldstone Radar Observations Planning: 2015 EG


Background


2015 EG was discovered on 2015 March 9 by the Mt. Lemmon Survey near Tucson, Arizona.
This asteroid has an absolute magnitude of 25.7 that suggests a diameter
within a factor of two of 25 meters.  Photometry obtained during the discovery apparition
suggests a rotation period of about 1.3 hours and a lightcurve amplitude of about 0.3 mag
(Thirouin et al. 2016).  As such, this object may have a modestly elongated shape.

2015 EG will approach within 0.00295 au (1.2 lunar distances) on March 4, when it will
be too far south for Goldstone to track.

We are expecting weak SNRs at Goldstone but they should be strong enough for 
CW observations and ranging.  The SNRs at Arecibo should be strong 
enough for delay-Doppler imaging.

We have one track scheduled at Goldstone on DOY 66 (March 7).  
Tracks at Arecibo are scheduled on March 7 and 8.  The first Arecibo track occurs only
a few hours before the start of the Goldstone track, so we anticipate using astrometry
obtained at Arecibo.

Pointing uncertainties for solution 14 are relatively large, but new optical astrometry is very likely
before the Goldstone track on March 7.

Update on March 5: New astrometry has come in and the pointing uncertainties are now tiny.

Update on March 6: Klystron problems have cancelled the Goldstone track.  

This asteroid is on the NHATS list of potential mission targets.

Orbital and Physical Characteristics  
Name                     2015 EG
Asteroid number          Not numbered             
Discoverer               Mt. Lemmon Survey
Discovery date           2015 March 9
orbit type               Aten                     
Close approach dist.     0.00295 au
Close approach dist.     1.15 lunar distances     
Close approach date      2019 Mar 04

semimajor axis           0.864 au                 
eccentricity             0.356
inclination              2.0 deg                 
Orbital period           0.803 years              
perihelion distance      0.566 au                 
aphelion distance        1.172 au                 
MOID                     0.00304 au
Tisserand parameter      6.79  (asteroidal)

absolute magnitude (H)   25.7                   
diameter                ~25 m +- a factor of two
optical albedo           unknown                 
rotation period          1.29 h            Thirouin et al. 2016
                         0.72 h            J. Chatelain and T. Lister, pers. comm., 2019 Mar 6
lightcurve amplitude     0.29 +- 0.02 mag  Thirouin et al. 2016
pole direction           unknown                 
spectral class           unknown                 
                         NHATS

Last update: 2019 March 6

Discovery M.P.E.C.

2015 EG
https://www.minorplanetcenter.net/mpec/K15/K15E25.html


SNR Calculations


2015 EG GOLDSTONE SNRS
                                                                       
DOY  start date    window        RA, dec   dist  runs   SNR/day   SNR/run  
60  2019 Mar 01  17:08-20:42    327, -30  0.017   373     10         1
61  2019 Mar 02  18:26-19:24    328, -34  0.012   148     21         2
...too far south for a couple of days...
64  2019 Mar 05  05:10-07:37    127, -31  0.004  1573   4518       117     
65  2019 Mar 06  01:46-10:33    137,  +1  0.008  1945    396        10    
66  2019 Mar 07  01:23-10:58    140,  +9  0.013  1285     56         2    Scheduled: 0615-0900 UT
67  2019 Mar 08  01:13-11:07    141, +13  0.019   947     15         1

Goldstone SNRs assume Ptx = 100 kW


2015 EG ARECIBO SNRS

start date     window        RA, dec   dist   runs     SNR/day   SNR/run
2019 Mar 06  02:33-02:53    137,  -1  0.007     92       2200       230
2019 Mar 07  01:38-03:58    139,  +8  0.013    351       1100        61  Scheduled
2019 Mar 08  01:30-04:06    141, +12  0.018    259        270        18  Scheduled
2019 Mar 09  01:27-04:07    141, +15  0.024    210         98         7
2019 Mar 10  01:23-04:06    142, +16  0.029    169         43         3
2019 Mar 11  01:20-04:04    142, +17  0.035    145         21         2
2019 Mar 12  01:17-04:02    142, +17  0.040    122         12         1

Arecibo SNRs assume Ptx = 400 kW, Gain = 8 K/Jy, and Tsys = 25 K.


Track Assignments


DOY BOA  BOT  EOT  EOA
066 0545 0715 0900 0930  14    GSSR      ASTEROID 2015 EG


Goldstone tracks:
     UT       UT          PST                  Duration Round-trip    
DOY  Date     TX Window   TX Window            hh:mm    time (sec)   
 66  Mar  7   0615-0900   2215-0100 Mar 6-7     2:45     13.5 - 14.1

The start time indicates when we can transmit, which is only 30 minutes 
after we get the telescope.



Arecibo tracks:
UT       UT          PST                Round-trip  
Date     TX Window   TX Window          time (sec)  
Mar  7   0138-0358   1738-1958 Mar 6      13
Mar  8   0130-0406   1730-2006 Mar 7      18



Uncertainties

2015 EG
JPL/Horizons solution 16, # obs: 95 (2011-2019)
2019 March 5
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2019-Mar-01 00:00 *   325.85938 -27.90605 0.02162111383477      1.057        0.47        1.73       0.000155
 2019-Mar-02 00:00 *   326.81453 -30.49362 0.01616749616600      1.355        0.52        1.90       0.000139
 2019-Mar-03 00:00 *   328.92481 -35.63494 0.01078867432161      2.000        0.69        2.50       0.000120
 2019-Mar-04 00:00 *   337.04635 -50.07694 0.00568576821715      4.078        1.68        6.10       0.000092
 2019-Mar-05 00:00 *m  115.54569 -52.19649 0.00304200815649      7.103        4.70       17.08       0.000079
 2019-Mar-06 00:00 *m  136.20014  -3.25533 0.00688152855293      1.764        0.74        2.68       0.000103
 2019-Mar-07 00:00 *m  139.36497   7.72969 0.01210508019206      0.974        0.53        1.93       0.000092
 2019-Mar-08 00:00 *m  140.65124  12.01599 0.01751774307801      0.664        0.48        1.73       0.000082

JPL/Horizons solution 15, # obs: 91 (2011-2015) (3 more observations from the discovery apparition)
2019 March 1 
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2019-Mar-01 00:00 *   325.85262 -27.90791 0.02162097410108    114.826       14.32       52.04       0.001759
 2019-Mar-02 00:00 *   326.80535 -30.49610 0.01616744461971    151.867       13.95       50.69       0.001346
 2019-Mar-03 00:00 *   328.91042 -35.63872 0.01078870445981    224.981       13.12       47.70       0.001013
 2019-Mar-04 00:00 *   337.01301 -50.08559 0.00568585147621    421.789       11.03       40.09       0.000754
 2019-Mar-05 00:00 *m  115.60448 -52.21880 0.00304188565101    773.131       48.09      174.77       0.000537
 2019-Mar-06 00:00 *m  136.21721  -3.26068 0.00688121054344    325.645       13.75       49.98       0.001386
 2019-Mar-07 00:00 *m  139.37432   7.72702 0.01210467049727    175.652       13.13       47.73       0.001804 *
 2019-Mar-08 00:00 *m  140.65746  12.01431 0.01751724763217    114.797       13.15       47.80       0.002229

JPL/Horizions solution 14, # obs: 88 (2011-2015)  Includes precovery observations.
2019 Feb 22
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2019-Mar-01 00:00 *   325.85581 -27.90700 0.02162108846359    119.808       14.86       53.99       0.001794
 2019-Mar-02 00:00 *   326.80969 -30.49489 0.01616751381535    158.468       14.46       52.55       0.001369
 2019-Mar-03 00:00 *   328.91720 -35.63686 0.01078873094050    234.778       13.56       49.30       0.001032
 2019-Mar-04 00:00 *   337.02862 -50.08129 0.00568584510965    440.193       11.18       40.65       0.000775
 2019-Mar-05 00:00 *m  115.57622 -52.20887 0.00304193314570    806.920       50.54      183.69       0.000570 
 2019-Mar-06 00:00 *m  136.20913  -3.25826 0.00688132926119    339.886       14.34       52.12       0.001464 
 2019-Mar-07 00:00 *m  139.36990   7.72825 0.01210483360891    183.349       13.63       49.55       0.001902

JPL/Horizons solution 12, which did not include 2011 precovery observations
2018 May 16
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2019-Mar-01 00:00 *   327.05639 -27.56772 0.02160676831781  46439.104     1501.29     5456.36       0.119189
 2019-Mar-02 00:00 *   328.44225 -30.03927 0.01614852277788  61719.473      871.99     3169.20       0.157667
 2019-Mar-03 00:00 *   331.47666 -34.92901 0.01076731581567  91942.959      887.85     3226.85       0.155433
 2019-Mar-04 00:00 *   342.84018 -48.37838 0.00567100985732 173314.622     9463.04    34392.98       0.002189
 2019-Mar-05 00:00 *m  106.07088 -47.75562 0.00308434548949 309018.153    15526.98    56432.08       0.797577
 2019-Mar-06 00:00 *m  133.15668  -2.27648 0.00694012496385 132269.258     1972.53     7169.06       0.807896
 2019-Mar-07 00:00 *m  137.67851   8.20968 0.01216608259024  72404.321      114.24      415.21       0.776396


Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination: 2015 EG Solution 14 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-O-T /r T-O-M/Illu% 2019-Feb-25 00:00 324.67749 -23.93326 0.04372608649778 30. 19.3155 /L 91.6/ 65.3 2019-Feb-26 00:00 324.83071 -24.50538 0.03816263782466 29. 20.5162 /L 78.6/ 55.0 2019-Feb-27 00:00 325.05753 -25.25549 0.03262349227850 28. 21.8015 /L 66.0/ 44.8 2019-Feb-28 00:00 325.40231 -26.29330 0.02710763099711 28. 23.2314 /L 54.0/ 35.1 2019-Mar-01 00:00 325.95686 -27.83875 0.02161718924689 27. 24.9379 /L 42.6/ 26.2 2019-Mar-02 00:00 326.94827 -30.40434 0.01616245465260 26. 27.2660 /L 32.4/ 18.3 2019-Mar-03 00:00 329.13616 -35.50200 0.01078196783846 24. 31.3858 /L 26.3/ 11.6 2019-Mar-04 00:00 337.53158 -49.81808 0.00567567268582 21. 43.5717 /L 35.7/ 6.3 2019-Mar-05 00:00 114.57780 -51.74217 0.00303007403002 15.62 107.6761 /T 106.6/ 2.5 2019-Mar-06 00:00 135.91902 -3.05376 0.00688027335335 16.22 148.3782 /T 151.1/ 0.5 2019-Mar-07 00:00 139.20381 7.84421 0.01210711296789 17.35 152.0720 /T 147.3/ 0.2 2019-Mar-08 00:00 140.53827 12.09459 0.01752135804228 18.17 151.8339 /T 136.7/ 1.8 2019-Mar-09 00:00 141.27540 14.32457 0.02299627439097 18.79 150.9789 /T 124.9/ 5.2 2019-Mar-10 00:00 141.75526 15.68861 0.02850279236507 19.29 149.9987 /T 112.8/ 10.4 Magnitudes and solar elongations at one-hour intervals on March 5 and 6: Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-O-T /r T-O-M/Illu% 2019-Mar-05 00:00 114.57780 -51.74217 0.00303007403002 15.62 107.6761 /T 106.6/ 2.5 2019-Mar-05 01:00 117.46914 -47.98824 0.00309029532792 15.54 111.4112 /T 110.7/ 2.4 2019-Mar-05 02:00 119.86437 -44.33703 0.00316620483827 15.48 114.9589 /T 114.6/ 2.3 2019-Mar-05 03:00 121.87472 -40.83161 0.00325670290996 15.44 118.2953 /T 118.3/ 2.2 2019-Mar-05 04:00 123.58226 -37.50035 0.00336060802513 15.42 121.4061 /T 121.7/ 2.1 2019-Mar-05 05:00 125.04830 -34.35963 0.00347671501810 15.41 124.2854 /T 124.9/ 2.0 2019-Mar-05 06:00 126.31921 -31.41637 0.00360384138163 15.41 126.9344 /T 127.9/ 1.9 2019-Mar-05 07:00 127.43057 -28.67047 0.00374086058520 15.43 129.3596 /T 130.6/ 1.8 2019-Mar-05 08:00 128.41003 -26.11680 0.00388672338383 15.45 131.5712 /T 133.1/ 1.7 2019-Mar-05 09:00 129.27931 -23.74690 0.00404046919876 15.48 133.5820 /T 135.4/ 1.6 2019-Mar-05 10:00 130.05573 -21.55026 0.00420122998948 15.51 135.4059 /T 137.5/ 1.5 2019-Mar-05 11:00 130.75320 -19.51537 0.00436822889059 15.55 137.0575 /T 139.3/ 1.4 2019-Mar-05 12:00 131.38303 -17.63033 0.00454077550452 15.59 138.5512 /T 141.0/ 1.3 2019-Mar-05 13:00 131.95450 -15.88340 0.00471825929512 15.64 139.9009 /T 142.5/ 1.2 2019-Mar-05 14:00 132.47530 -14.26326 0.00490014211303 15.69 141.1200 /T 143.9/ 1.1 2019-Mar-05 15:00 132.95180 -12.75925 0.00508595054364 15.74 142.2206 /T 145.1/ 1.1 2019-Mar-05 16:00 133.38941 -11.36142 0.00527526850980 15.79 143.2143 /T 146.2/ 1.0 2019-Mar-05 17:00 133.79265 -10.06061 0.00546773037676 15.84 144.1113 /T 147.2/ 0.9 2019-Mar-05 18:00 134.16541 -8.84841 0.00566301468032 15.90 144.9212 /T 148.0/ 0.8 2019-Mar-05 19:00 134.51099 -7.71718 0.00586083851782 15.95 145.6526 /T 148.8/ 0.8 2019-Mar-05 20:00 134.83225 -6.65995 0.00606095259120 16.01 146.3133 /T 149.4/ 0.7 2019-Mar-05 21:00 135.13167 -5.67043 0.00626313686286 16.06 146.9102 /T 150.0/ 0.7 2019-Mar-05 22:00 135.41139 -4.74291 0.00646719677058 16.12 147.4497 /T 150.4/ 0.6 2019-Mar-05 23:00 135.67329 -3.87224 0.00667295994251 16.17 147.9373 /T 150.8/ 0.5 2019-Mar-06 00:00 135.91902 -3.05376 0.00688027335335 16.22 148.3782 /T 151.1/ 0.5 2019-Mar-06 01:00 136.15003 -2.28325 0.00708900086593 16.28 148.7769 /T 151.4/ 0.4 2019-Mar-06 02:00 136.36760 -1.55689 0.00729902110720 16.33 149.1375 /T 151.6/ 0.4 2019-Mar-06 03:00 136.57287 -0.87124 0.00751022563328 16.38 149.4635 /T 151.7/ 0.4 2019-Mar-06 04:00 136.76686 -0.22317 0.00772251734308 16.44 149.7584 /T 151.8/ 0.3 2019-Mar-06 05:00 136.95048 0.39016 0.00793580910588 16.49 150.0250 /T 151.8/ 0.3 2019-Mar-06 06:00 137.12454 0.97132 0.00815002257242 16.54 150.2660 /T 151.8/ 0.3

Setups



Given the rotation period and a rough guess for the diameter, we are expecting a bandwidth of about 2 Hz.

CW setup:
---------------------------------------------------------------------------
TX polarization           RCP
RCV polarization          LCP & RCP
Frequency hops:           no hopping
Bandwidth:               5000 Hz 
TXoffset                  +500 Hz
FFT                     10000 for 0.5 Hz resolution 

Ranging setups:
---------------------------------------------------------------------------
10-usec
baud             10 usec
code            127
PRP            1270 usec
ncoh              1 
bandwidth       787 Hz   
FFT             128
resolution       6.15 Hz
TXoffset       +100 Hz  (echo in column 80)
---------------------------------------------------------------------------
11-usec 
baud             11 usec
code            127
PRP            1397 usec
ncoh              1 
bandwidth       716 Hz   
FFT             128
resolution      5.6 Hz
TXoffset     +100 Hz  (echo in column 82) 
-------------------------------------------------------------------------
1-usec 
baud              1 usec
code            255
ncoh             16
bandwidth       245 Hz   
FFT             128
resolution        1.9 Hz
TXoffset        +50 Hz  (echo in column 116)
---------------------------------------------------------------------

Instructions

NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/2015eg/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

2013 CW32 GOLDSTONE MASTERLOG

============================================================================== Receive TX Setup hops dwell code ncoh FFT runs start -stop OSOD offset Poln Notes ------------------------------------------------------------------------------
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/2015EG_planning.html

Asteroid Radar Astronomy
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