1981 Midas (1973 EA)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.6504955739 ± 4.39e-09
Semi-major axis (a)1.7762715081 AU ± 6.91e-10
Inclination (i)39.82339034° ± 1.52e-06
Long. of Asc. Node (Ω)356.79391976° ± 4.07e-07
Arg. of Perihelion (ω)267.84423496° ± 9.83e-07
Mean Anomaly (M)65.34753960° ± 7.65e-07
Mean Motion (n)0.4163401091°/day ± 2.43e-10
Perihelion dist (q)0.62081475 AU ± 7.80e-09
Aphelion dist (Q)2.93172826 AU ± 7.88e-09
Orbital Period2.36735847 yr ± 1.38e-09
Physical Parameters
H (abs. magnitude)15.28
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.228″
Uncertainty0
Orbit TypeApollo
MOID0.003514 AU
Observations Used2243
Radar Obs Used7
Gaia Obs Used28
Oppositions25
Arc Total1973-2026
First Observation Used1973-03-06
Last Observation Used2026-01-02
Observations (2402)
Date Type RA Dec Mag Band Observatory
2020-11-16 04:50:20 C 20 11 31.31 -18 21 31.7 V T05
2020-11-16 04:58:17 C 20 11 32.92 -18 21 14.1 V T05
2020-11-16 05:15:29 C 20 11 36.48 -18 20 35.4 V T05
2020-11-17 00:31:43 C 20 15 34.00 -17 38 07.3 V W33
2020-11-17 00:34:56 C 20 15 34.64 -17 38 00.1 V W33
2020-11-17 00:38:09 C 20 15 35.29 -17 37 53.2 V W33
2020-11-25 01:27:56 C 20 50 29.02 -11 02 28.4 V 703
2020-11-25 01:36:20 C 20 50 30.39 -11 02 11.6 V 703
2020-11-25 01:44:43 C 20 50 31.79 -11 01 56.6 V 703
2020-11-25 01:53:07 C 20 50 33.13 -11 01 40.0 V 703
2020-11-27 01:44:53 C 20 58 06.20 -09 32 30.7 V 703
2020-11-27 01:52:39 C 20 58 07.32 -09 32 17.0 V 703
2020-11-27 02:00:26 C 20 58 08.53 -09 32 01.6 V 703
2020-11-27 02:08:13 C 20 58 09.65 -09 31 48.2 V 703
2020-11-29 04:46:14 C 21 05 45.43 -08 01 22.8 V T05
2020-11-29 04:51:30 C 21 05 46.22 -08 01 13.7 V T05
2020-11-29 04:59:26 C 21 05 47.37 -08 00 59.9 V T05
2020-11-29 05:15:28 C 21 05 49.67 -08 00 31.6 V T05
2020-12-03 01:27:00 C 21 18 45.57 -05 25 50.2 V 703
2020-12-03 01:35:22 C 21 18 46.69 -05 25 36.5 V 703
2020-12-03 01:43:45 C 21 18 47.78 -05 25 23.0 V 703
2020-12-03 01:52:08 C 21 18 48.90 -05 25 10.1 V 703
2020-12-03 05:03:33 C 21 19 14.588 -05 20 00.48 U F52
2020-12-03 05:19:09 C 21 19 16.655 -05 19 35.38 U F52
2020-12-03 05:46:59 C 21 19 20.34 -05 18 50.7 V T05
2020-12-03 05:50:22 C 21 19 20.795 -05 18 45.18 U F52
2020-12-03 05:55:33 C 21 19 21.48 -05 18 36.6 V T05
2020-12-03 06:14:43 C 21 19 24.00 -05 18 06.3 V T05
2020-12-04 01:56:08 C 21 22 01.11 -04 46 44.3 V 703
2020-12-04 02:03:48 C 21 22 02.11 -04 46 33.5 V 703
2020-12-04 02:19:09 C 21 22 04.15 -04 46 09.4 V 703
2020-12-05 04:55:41 C 21 25 32.44 -04 04 39.5 V T08
2020-12-05 05:00:59 C 21 25 33.12 -04 04 31.1 V T08
2020-12-05 05:11:45 C 21 25 34.47 -04 04 15.1 V T08
2020-12-05 05:27:01 C 21 25 36.26 -04 03 52.1 V T08
2020-12-06 01:58:43 C 21 28 14.05 -03 32 30.9 V 703
2020-12-06 02:06:55 C 21 28 15.09 -03 32 17.9 V 703
2020-12-06 02:15:07 C 21 28 16.10 -03 32 06.1 V 703
2020-12-06 02:23:19 C 21 28 17.19 -03 31 53.9 V 703
2020-12-07 05:03:43 C 21 31 38.12 -02 51 56.7 V T05
2020-12-07 05:07:44 C 21 31 38.63 -02 51 50.7 V T05
2020-12-07 05:17:38 C 21 31 39.83 -02 51 36.3 V T05
2020-12-07 05:32:19 C 21 31 41.61 -02 51 14.6 V T05
2020-12-09 05:32:48 C 21 37 33.37 -01 41 39.0 V T08
2020-12-09 05:38:46 C 21 37 34.07 -01 41 30.2 V T08
2020-12-09 05:48:43 C 21 37 35.24 -01 41 16.0 V T08
2020-12-09 05:54:01 C 21 37 35.90 -01 41 08.2 V T08
2020-12-09 06:02:39 C 21 37 36.90 -01 40 56.1 V T08
2020-12-09 06:03:18 C 21 37 36.98 -01 40 55.3 V T08
2020-12-09 06:19:15 C 21 37 38.87 -01 40 32.8 V T08
Radar Observations (8)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1987-09-25 04:00:00 -1130345 21 Hz 8495 -14 -14
1987-09-25.166667 -113034500 1500 Hz 8495 253 253
2018-03-21 22:59:00 89358361.22 1.11 us 2380 -1 -1
2018-03-22 23:24:00 90863191.54 1.53 us 2380 -1 -1
2018-03-23 22:02:00 94516753.78 1.35 us 2380 -1 -1
2018-03-23 23:26:00 94811323.08 1.19 us 2380 -1 -1
2018-03-24 21:24:00 100309946.32 1.29 us 2380 -1 -1
2018-03-25 21:34:00 108108721.41 1.65 us 2380 -1 -1
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)