Goldstone Radar Observations Planning: 2017 TS3
2017 TS3 2017 TS3 was discovered in October, 2017 by Pan-STARRS 1. The absolute magnitude is 22.1, suggesting a diameter of roughly 120 meters, but otherwise nothing is known about its physical properties. This asteroid will approach within about 0.036 au on November 2. Tracks are scheduled at Goldstone on November 1 and 2. We are expecting SNRs strong enough for CW and ranging observations but probably not detailed delay-Doppler imaging. Orbital uncertainties for this asteroid are relatively large so we request optical astrometry. The asteroid could be recovered as soon as the second or third week of September when the brightness reaches about magnitude 21, while solar elongations are favorable, the solution 22 3-sigma pointing uncertainties are below 3000 arcsec, and before the Moon becomes full. By mid-October the 3-sigma pointing uncertainties will increase to ~7000 arcsec. 2021 Sep 29 Update: This object has been recovered and orbital uncertainties with solution 24 are small. 2021 Oct 18 Update: J. Chatelain and T. Lister report a rotation period of 34.7 h and a lightcurve amplitude of 0.5 mag. All else being equal, this suggests that SNRs will be about 4x stronger than previously guessed. The lightcurve amplitude may imply a moderate degree of elongation. If the diameter is close to 0.12 km, then the bandwidth at Goldstone could be ~0.35 Hz for an equatorial view.
Orbital and Physical Characteristics Name 2017 TS3 Asteroid number not numbered Discoverer Pan-STARRS 1 Discovery date 2017 Oct 10 Orbit type Apollo Close approach distance 0.0355 au Close approach distance 13.8 LD Close approach date 2021 Nov 2 Semimajor axis 2.498 au Eccentricity 0.618 Inclination 4.9 deg Orbital period 3.95 years Perihelion distance 0.954 au Aphelion distance 4.042 au MOID 0.026 au Absolute magnitude (H) 22.1 Diameter ~0.12 km Optical albedo unknown Rotation period 34.7 h Chatelain and Lister (pers. comm.) Lightcurve amplitude 0.5 mag Chatelain and Lister (pers. comm.) Spectral class unknown PHA? No Last update: 2021 November 2
Echo power spectrum obtained on November 1.
2017 TS3 https://www.minorplanetcenter.net/mpec/K17/K17T68.html
Goldstone SNRs 2017 TS3 2017 TS3: D = 0.12 km, P = 34.7 h, OC albedo = 0.1 DOY start date window RA, dec dist runs SNR/day SNR/run 298-299 2021 Oct 25-26 22:23-12:37 359, +55 0.053 480 59 3 299-300 2021 Oct 26-27 22:09-13:12 2, +59 0.049 547 83 4 300-301 2021 Oct 27-28 21:51-14:10 6, +64 0.045 637 120 5 301-302 2021 Oct 28-29 21:25-16:16 14, +70 0.042 774 170 7 302-303 2021 Oct 29-30 20:27-17:31 30, +75 0.039 1100 240 8 303-304 2021 Oct 30-31 22:21-21:36 67, +79 0.037 1164 300 10 305 2021 Nov 1 01:29-23:37 113, +76 0.036 1202 340 11 Scheduled 1130-1300 306 2021 Nov 2 03:50-22:27 134, +69 0.036 884 310 12 Scheduled 0515-0645 307 2021 Nov 3 06:27-21:57 143, +61 0.037 745 270 11 308 2021 Nov 4 07:37-21:36 149, +53 0.038 650 210 9 309 2021 Nov 5 08:18-21:19 152, +46 0.041 571 160 7 310 2021 Nov 6 08:46-21:05 154, +39 0.044 505 120 6 311 2021 Nov 7 09:05-20:52 156, +34 0.047 448 85 4 Horizons were set at 20 deg except on two days when they were set at 25 deg to make the asteroid appear to set. We could start early on both days if we're ready.
Track Assignments
DOY BOA BOT EOT EOA 305 1000 1130 1300 1330 GSSR AST 2017 TS3 306 0345 0515 0645 0715 GSSR AST 2017 TS3 Goldstone tracks: UT UT PST Duration Round-trip DOY Date TX Window TX Window hh:mm time (sec) SNR/run 305 Nov 1 1130-1300 0330-0500 Nov 1 1:30 36 11 306 Nov 2 0515-0645 2215-2345 Nov 1 1:30 36 12 Due to the 34.7 h rotation period, Goldstone observations will see longitudes separated by about 184 degrees. Tracks 90 minutes in duration will cover about 15 degrees of rotation.
Uncertainties
2017 TS3 JPL/Horizons solution 38, # obs: 193 (2017-2021) 2021 Oct 28 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_X_3sig RT_delay_3sig 2021-Oct-25 00:00 * 355.99795 49.97603 0.05888959215500 0.431 0.68 0.000177 2021-Oct-26 00:00 * 357.64141 53.51447 0.05442183931422 0.486 0.80 0.000175 2021-Oct-27 00:00 * 359.98735 57.61016 0.05022219874671 0.553 0.97 0.000172 2021-Oct-28 00:00 * 3.54852 62.32706 0.04635826193177 0.636 1.20 0.000168 2021-Oct-29 00:00 * 9.46457 67.66214 0.04291568223764 0.735 1.51 0.000162 2021-Oct-30 00:00 * 20.68558 73.38083 0.03999849552623 0.849 1.88 0.000153 2021-Oct-31 00:00 * 45.42220 78.39021 0.03772409280850 0.970 2.30 0.000142 2021-Nov-01 00:00 * 90.28521 79.20754 0.03620934518431 1.083 2.70 0.000129 Scheduled 2021-Nov-02 00:00 * 123.43138 74.04006 0.03554730432054 1.169 2.99 0.000116 Scheduled 2021-Nov-03 00:00 * 138.35892 66.35216 0.03578143650091 1.212 3.10 0.000105 2021-Nov-04 00:00 *m 145.78780 58.24237 0.03689110611563 1.208 3.00 0.000100 We're expecting a bandwidth of ~0.35 Hz so there could be a visible Doppler correction. JPL/Horizons solution 24, # obs: 95 (2017-2021) 2021 Sep 29 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_X_3sig RT_delay_3sig 2021-Oct-25 00:00 * 355.99796 49.97601 0.05888959233433 1.683 2.40 0.000322 2021-Oct-26 00:00 * 357.64142 53.51445 0.05442183840042 1.878 2.97 0.000304 2021-Oct-27 00:00 * 359.98735 57.61014 0.05022219654545 2.102 3.69 0.000284 2021-Oct-28 00:00 * 3.54852 62.32703 0.04635825822184 2.351 4.55 0.000259 2021-Oct-29 00:00 * 9.46456 67.66212 0.04291567678252 2.616 5.56 0.000233 2021-Oct-30 00:00 * 20.68555 73.38080 0.03999848810108 2.876 6.63 0.000210 2021-Oct-31 00:00 * 45.42211 78.39019 0.03772408324704 3.093 7.63 0.000198 2021-Nov-01 00:00 * 90.28508 79.20753 0.03620933343962 3.222 8.32 0.000209 2021-Nov-02 00:00 * 123.43130 74.04007 0.03554729051500 3.222 8.49 0.000243 2021-Nov-03 00:00 * 138.35888 66.35217 0.03578142092923 3.083 8.05 0.000293 2021-Nov-04 00:00 *m 145.78778 58.24238 0.03689108918537 2.831 7.13 0.000346 JPL/Horizons solution 22, # obs: 76 (2017-2018) 2021 Aug 31, OCC = 5 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_X_3sig RT_delay_3sig 2021-Oct-25 00:00 * 356.69473 50.46186 0.05866774638664 15071.629 19695.43 1.376467 2021-Oct-27 00:00 * 1.03103 58.18721 0.05007502823548 18278.824 30473.49 0.898713 2021-Oct-29 00:00 * 11.45380 68.26593 0.04288238724517 21876.222 45020.96 0.172672 2021-Oct-31 00:00 * 50.79061 78.45808 0.03785117817784 24490.161 58869.97 0.844160 2021-Nov-01 00:00 * 94.59995 78.50707 0.03643007316245 24640.723 61958.88 1.434469 2021-Nov-02 00:00 * 124.61657 73.04662 0.03586362451173 23671.199 60541.87 2.034416 2021-Nov-03 00:00 * 138.52194 65.39407 0.03618806808129 21628.264 54604.28 2.598868 2021-Nov-04 00:00 *m 145.67163 57.40594 0.03737661300840 18854.974 45667.04 3.090190 Astrometry in the second or third week of September would be ideal before the plane-of-sky position uncertainties grow to large values.
Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination: 2017 TS3 Solution 22 (OCC = 5) 2021 Aug 31 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-brt S-O-T /r T-O-M/MN_Illu% 2021-Sep-23 00:00 352.32613 19.89952 0.25252071685327 20.485 n.a. 158.7381 /T 32.8/ 95.8587 2021-Sep-25 00:00 352.14268 20.56691 0.23800534906087 20.355 n.a. 158.0725 /T 50.9/ 85.0024 2021-Sep-27 00:00 351.95764 21.27405 0.22386520648912 20.224 n.a. 157.2336 /T 71.3/ 69.3338 2021-Sep-29 00:00 351.77513 22.02868 0.21008404712356 20.093 n.a. 156.2380 /T 92.1/ 50.9124 2021-Oct-01 00:00 351.60010 22.84049 0.19664559419955 19.960 n.a. 155.1032 /T 113.0/ 31.8368 2021-Oct-03 00:00 351.43867 23.72173 0.18353371952298 19.824 n.a. 153.8471 /T 133.1/ 14.7154 2021-Oct-05 00:00 351.29845 24.68815 0.17073263505801 19.684 n.a. 152.4862 /T 147.7/ 3.0327 2021-Oct-07 00:00 351.18914 25.76024 0.15822699656805 19.539 n.a. 151.0354 /T 144.9/ 0.4949 2021-Oct-09 00:00 351.12300 26.96507 0.14600210625869 19.387 n.a. 149.5071 /T 126.3/ 8.9290 2021-Oct-11 00:00 351.11544 28.33865 0.13404482109798 19.226 n.a. 147.9100 /T 103.4/ 26.4925 2021-Oct-13 00:00 351.18618 29.92935 0.12234569288464 19.054 n.a. 146.2474 /T 80.9/ 48.5234 2021-Oct-15 00:00 351.36187 31.80307 0.11090225116277 18.871 n.a. 144.5152 /T 61.0/ 69.9917 2021-Oct-17 00:00 351.68119 34.05145 0.09972330410899 18.673 n.a. 142.6970 /T 46.3/ 87.0398 2021-Oct-19 00:00 352.20495 36.80478 0.08883497257385 18.459 n.a. 140.7567 /T 40.7/ 97.2992 2021-Oct-21 00:00 353.03709 40.25227 0.07829028875842 18.228 n.a. 138.6235 /T 45.2/ 99.8139 2021-Oct-23 00:00 354.37439 44.67263 0.06818571852626 17.981 n.a. 136.1635 /T 55.4/ 94.8626 2021-Oct-25 00:00 356.64216 50.47262 0.05869056779753 17.725 n.a. 133.1291 /T 66.3/ 83.5882 2021-Oct-27 00:00 0.95619 58.19757 0.05009837246281 17.481 n.a. 129.0796 /T 74.8/ 67.5496 2021-Oct-29 00:00 11.32829 68.27870 0.04290505752431 17.293 n.a. 123.3281 /T 78.9/ 48.5180 2021-Oct-31 00:00 50.58334 78.49737 0.03787098094284 17.247 n.a. 115.1785 /L 78.3/ 28.7324 2021-Nov-02 00:00 124.68225 73.10795 0.03587763004631 17.437 n.a. 104.8754 /L 77.1/ 11.4821 2021-Nov-04 00:00 145.73425 57.46103 0.03738280582157 17.874 n.a. 94.4216 /L 83.3/ 1.2160
Setups
If the diameter is close to 0.12 km, then the 34.7 h rotation period implies a bandwidth of about 0.35 Hz for an equatorial view. CW setup: --------------------------------------------------------------------------- TX polarization RCP RCV polarization LCP & RCP Frequency hops: no hopping Bandwidth: 5000 Hz TXoffset +500 Hz FFT 50000 for 0.1 Hz resolution Ranging setups below will need changes to deal with the narrow bandwidth. 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 8 bandwidth 490 Hz FFT 128 resolution 3.8 Hz TXoffset +50 Hz (echo in column 77) ---------------------------------------------------------------------
Instructions
NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/2017ts3/raw/
POINTING:
OSOD and predicts are on aardvark: POINTING ...Not yet available... Transmit offsets are given in millidegrees.
PRDX.OUT.14f-14-14.s?? TRANSMITTER: STATION #14, RECEIVER: STATION #14 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
2017 TS3 GOLDSTONE MASTERLOG
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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 https://echo.jpl.nasa.gov/asteroids/2017TS3/2017TS3.2021.goldstone.planning.html
Asteroid Radar Astronomy