2100 Ra-Shalom (1978 RA)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4364955679 ± 2.00e+00
Semi-major axis (a)0.8320181223 AU ± 3.00e+00
Inclination (i)15.75890506° ± 4.00e+00
Long. of Asc. Node (Ω)170.76329799° ± 5.00e+00
Arg. of Perihelion (ω)356.08164717° ± 6.00e+00
Mean Anomaly (M)249.10870172° ± 4.17e-06
Mean Motion (n)1.2987127297°/day ± 7.02e+00
Perihelion dist (q)0.46884590 AU ± 2.37e+00
Aphelion dist (Q)1.19519035 AU ± 4.62e+00
Orbital Period0.75892556 yr ± 4.10e+00
NGA Modelr2
A2-1.01979994e-06 AU/d²
Physical Parameters
H (abs. magnitude)16.24
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-26
RMS Residual0.161″
Uncertainty0
Orbit TypeAten
MOID0.149239 AU
Observations Used5029
Radar Obs Used6
Gaia Obs Used44
Oppositions13
Arc Total1975-2026
First Observation Used1975-10-03
Last Observation Used2026-01-06
Observations (5346)
Date Type RA Dec Mag Band Observatory
1975-10-03 04:12:51 A 01 00 12.49 -33 37 39.4 809
1975-10-03 05:12:54 A 00 59 57.81 -33 42 54.0 809
1975-10-05 04:09:54 A 00 48 41.99 -37 43 42.4 809
1975-10-05 05:09:55 A 00 48 25.94 -37 48 41.1 809
1978-09-10 09:41:00 A 23 19 19.04 +01 08 43.4 11.5 675
1978-09-10 10:00:00 A 23 19 15.18 +01 07 30.6 675
1978-09-11 04:04:15 A 23 15 39.14 -00 03 15.0 675
1978-09-11 04:17:00 A 23 15 36.42 -00 04 06.5 675
1978-09-11 07:36:00 A 23 14 53.93 -00 17 07.8 10.0 688
1978-09-11 07:36:59 A 23 14 53.85 -00 17 11.1 675
1978-09-11 07:47:29 A 23 14 51.83 -00 17 53.0 675
1978-09-11 09:41:00 A 23 14 27.35 -00 25 17.0 675
1978-09-11 11:39:30 A 23 14 02.34 -00 33 04.3 675
1978-09-12 03:50:30 A 23 10 49.33 -01 36 45.5 675
1978-09-12 08:26:59 A 23 09 50.43 -01 54 57.6 688
1978-09-12 09:41:00 A 23 09 34.73 -01 59 45.9 675
1978-09-12 11:06:30 A 23 09 16.53 -02 05 24.3 675
1978-09-13 16:29:00 A 23 03 20.40 -04 00 08.8 323
1978-09-13 16:43:59 A 23 03 17.17 -04 01 08.5 323
1978-09-20 03:33:59 A 22 32 52.59 -13 41 36.8 688
1978-09-22 01:54:59 A 22 24 22.67 -16 16 30.2 809
1978-09-22 13:54:59 A 22 22 14.44 -16 55 01.4 323
1978-09-24 21:00:00 A 22 12 50.24 -19 43 06.0 14.5 026
1978-09-24 21:20:00 A 22 12 46.99 -19 43 57.8 026
1978-09-25 12:37:59 A 22 10 18.14 -20 26 47.5 323
1978-09-25 19:15:37 A 22 09 13.99 -20 46 07.3 14.5 046
1978-09-25 19:28:07 A 22 09 12.08 -20 46 38.9 046
1978-09-25 21:42:29 A 22 08 49.84 -20 52 50.5 14.8 026
1978-09-25 21:57:29 A 22 08 47.44 -20 53 27.5 026
1978-09-30 05:24:30 A 21 53 39.48 -25 10 01.1 688
1981-07-09 10:25:59 A 01 42 43.34 +57 44 37.1 18.0 675
1981-07-09 10:56:00 A 01 42 37.11 +57 44 35.5 18.0 675
1981-07-25 07:25:59 A 00 23 50.14 +55 14 40.4 688
1981-07-25 07:48:59 A 00 23 44.89 +55 14 20.0 688
1981-07-28 04:57:38 A 00 07 30.22 +54 15 20.2 A 801
1981-08-05 22:56:59 A 23 13 31.41 +49 16 30.5 026
1981-08-20 22:02:03 A 21 41 45.17 +30 09 46.8 14.5 494
1981-08-20 22:13:26 A 21 41 42.64 +30 08 59.9 14.5 494
1981-08-24 20:37:00 21 22 18.19 +23 07 18.6 552
1981-08-24 21:02:00 21 22 12.95 +23 05 20.8 552
1981-08-25 22:06:31 A 21 17 32.09 +21 10 13.2 14.0 494
1981-08-26 22:47:59 A 21 13 07.47 +19 16 46.1 026
1981-08-28 17:08:59 A 21 06 01.95 +16 04 01.8 323
1981-08-28 20:44:12 A 21 05 29.89 +15 46 44.7 026
1981-08-28 20:53:48 A 21 05 28.26 +15 46 01.5 026
1981-08-30 20:17:30 A 20 58 19.70 +12 13 41.9 026
1981-08-30 20:23:29 A 20 58 18.72 +12 13 15.0 026
1981-08-30 20:29:30 A 20 58 17.76 +12 12 48.0 026
1981-08-31 13:09:59 A 20 55 57.82 +11 00 41.2 323
1981-09-02 22:55:29 A 20 48 32.08 +06 54 58.6 489
Radar Observations (17)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1981-08-25 02:00:00 -18021.4 1 Hz 2380 -1 -1
1981-08-25.083333 -1802140 20 Hz 2380 251 251
1984-08-21 00:00:00 -98092 1 Hz 2380 -1 -1
1984-08-21.000000 -9809200 100 Hz 2380 251 251
2000-08-27 06:00:00 202910964 10 us 2380 -1 -1
2000-08-27.250000 20291096400 10000 us 2380 251 251
2000-08-30 05:00:00 196039017 10 us 2380 -1 -1
2000-08-30.208333 19603901700 10000 us 2380 251 251
2003-08-22 02:10:35 176875273 1.5 us 2380 -1 -1
2003-08-22 02:15:00 176879019.6 0.5 us 2380 -1 -1
2003-08-22.090683 17687527300 1500 us 2380 251 251
2003-08-22.093750 17687901960 500 us 2380 251 251
2016-09-26 08:40:00 178120943.18 10 us 8560 -14 -14
2016-09-27 07:50:00 174259621.3 3 us 8560 -14 -14
2016-09-30 08:50:00 163725075.83 5 us 8560 -14 -14
2019-09-08 06:54:00 206862668.32 6 us 2380 -1 -1
2022-09-03 05:30:00 187861848.74 2 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)