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
2018-11-05 05:55:20 C 19 00 52.42 -18 05 35.5 U T08
2018-11-07 05:15:13 C 19 07 50.50 -18 14 05.3 U T05
2018-11-07 05:28:57 C 19 07 52.46 -18 14 06.6 U T05
2018-11-07 05:43:17 C 19 07 54.57 -18 14 08.0 U T05
2018-11-07 05:56:57 C 19 07 56.51 -18 14 10.3 U T05
2018-12-03 04:47:53 C 20 33 11.29 -18 18 04.3 U T08
2018-12-03 04:58:00 C 20 33 12.53 -18 18 02.6 U T08
2018-12-03 05:09:30 C 20 33 14.09 -18 18 00.5 U T08
2018-12-03 05:20:54 C 20 33 15.48 -18 18 00.1 U T08
2018-12-13 01:46:37 C 21 03 17.85 -17 36 06.2 U I41
2018-12-13 01:53:42 C 21 03 18.73 -17 36 03.8 U I41
2018-12-13 02:00:48 C 21 03 19.59 -17 36 02.9 U I41
2018-12-13 02:07:52 C 21 03 20.44 -17 36 01.5 U I41
2018-12-21 01:49:35 C 21 27 04.94 -16 47 45.2 U I41
2018-12-21 01:56:36 C 21 27 05.78 -16 47 43.4 U I41
2018-12-21 02:03:36 C 21 27 06.64 -16 47 41.4 U I41
2018-12-21 02:10:37 C 21 27 07.49 -16 47 39.2 U I41
2018-12-31 01:51:04 C 21 56 15.80 -15 31 14.5 I41
2018-12-31 01:58:16 C 21 56 16.65 -15 31 12.2 I41
2018-12-31 02:05:28 C 21 56 17.54 -15 31 09.5 I41
2018-12-31 02:12:40 C 21 56 18.40 -15 31 06.7 I41
2019-06-19 14:28:54 C 00 53 42.87 +30 03 51.0 V T08
2019-06-19 14:34:19 C 00 53 43.00 +30 03 50.1 V T08
2019-06-19 14:41:49 C 00 53 43.11 +30 03 49.7 V T08
2019-06-19 14:47:33 C 00 53 43.22 +30 03 49.6 V T08
2019-06-21 14:02:38 C 00 54 59.92 +29 59 34.0 V T05
2019-06-21 14:06:58 C 00 55 00.06 +29 59 34.2 V T05
2019-06-21 14:15:02 C 00 55 00.29 +29 59 32.9 V T05
2019-06-21 14:31:33 C 00 55 00.69 +29 59 31.9 V T05
2019-06-23 01:38:15 C 00 56 02.46 +29 56 29.0 V C95
2019-06-23 01:46:45 C 00 56 02.66 +29 56 27.9 V C95
2019-06-23 01:55:14 C 00 56 02.94 +29 56 28.0 V C95
2019-07-08 09:29:14 C 01 08 57.00 +29 28 56.8 V 703
2019-07-08 09:44:23 C 01 08 57.54 +29 28 55.6 V 703
2019-07-08 09:51:59 C 01 08 57.79 +29 28 55.2 V 703
2019-07-15 14:16:33 C 01 15 10.32 +29 10 05.7 V T05
2019-07-15 14:20:38 C 01 15 10.45 +29 10 05.2 V T05
2019-07-15 14:37:33 C 01 15 10.93 +29 10 03.0 V T05
2019-07-15 14:53:28 C 01 15 11.42 +29 10 01.3 V T05
2019-07-17 13:09:49 C 01 16 46.87 +29 03 24.3 V T08
2019-07-17 13:17:55 C 01 16 47.08 +29 03 23.0 V T08
2019-07-17 13:22:38 C 01 16 47.24 +29 03 22.5 V T08
2019-07-17 13:39:23 C 01 16 47.72 +29 03 20.4 V T08
2019-07-17 15:02:05 C 01 16 50.11 +29 03 09.3 V T08
2019-07-20 01:07:34 C 01 18 44.94 +28 53 30.8 q 160
2019-07-20 01:10:32 C 01 18 45.04 +28 53 29.7 q 160
2019-07-20 01:13:30 C 01 18 45.34 +28 53 29.2 q 160
2019-07-20 21:39:57 S 01 19 22.25 +28 49 48.1 L C51
2019-07-21 00:48:16 S 01 19 28.12 +28 49 12.9 L C51
2019-07-21 01:21:53 C 01 19 30.76 +28 49 05.4 q 160
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)