Goldstone Radar Observations Planning: 2015 EG
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
2015 EG https://www.minorplanetcenter.net/mpec/K15/K15E25.html
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