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
2013-03-01 00:33:50 C 07 36 56.41 +68 07 38.0 q C73
2013-03-01 00:35:00 C 07 36 56.29 +68 07 37.0 q C73
2013-03-01 00:36:09 C 07 36 56.14 +68 07 35.8 q C73
2013-03-01 00:37:18 C 07 36 56.01 +68 07 34.8 q C73
2013-03-01 00:38:27 C 07 36 55.95 +68 07 33.7 q C73
2013-03-01 00:39:02 C 07 36 55.89 +68 07 33.2 q C73
2013-03-01 00:39:36 C 07 36 55.64 +68 07 33.6 q C73
2013-03-01 00:40:11 C 07 36 55.69 +68 07 32.3 q C73
2013-03-01 00:40:45 C 07 36 55.76 +68 07 31.5 q C73
2013-03-01 00:41:20 C 07 36 55.42 +68 07 32.1 q C73
2013-03-01 00:41:55 C 07 36 55.40 +68 07 31.8 q C73
2013-03-23 03:15:56 C 07 07 15.42 +59 32 20.4 u 703
2013-03-23 03:24:40 C 07 07 15.31 +59 32 10.8 u 703
2013-03-23 03:33:31 C 07 07 15.24 +59 32 02.9 u 703
2013-03-23 03:42:17 C 07 07 15.20 +59 31 52.7 u 703
2013-03-28 02:43:50 C 07 07 16.72 +57 27 11.1 u H21
2013-03-28 02:50:09 C 07 07 16.76 +57 27 04.4 u H21
2013-03-28 02:56:28 C 07 07 16.76 +57 26 57.7 u H21
2013-04-16 04:54:39 C 07 19 43.53 +49 27 35.1 u 703
2013-04-16 05:05:10 C 07 19 44.00 +49 27 24.4 u 703
2013-04-16 05:15:48 C 07 19 44.43 +49 27 13.4 u 703
2013-04-16 05:26:19 C 07 19 44.79 +49 27 02.0 u 703
2013-04-21 01:28:48 C 07 25 03.65 +47 26 33.2 u H21
2013-04-21 01:32:50 C 07 25 03.85 +47 26 29.3 u H21
2013-04-21 01:37:29 C 07 25 04.06 +47 26 24.3 u H21
2013-04-21 01:41:31 C 07 25 04.25 +47 26 19.8 u H21
2013-04-21 01:45:32 C 07 25 04.44 +47 26 15.8 u H21
2013-04-21 01:49:58 C 07 25 04.64 +47 26 11.1 u H21
2013-04-22 01:25:41 C 07 26 14.02 +47 01 43.5 u H21
2013-04-22 01:30:20 C 07 26 14.24 +47 01 38.4 u H21
2013-04-22 01:35:26 C 07 26 14.47 +47 01 33.0 u H21
2013-04-22 01:40:31 C 07 26 14.73 +47 01 27.9 u H21
2013-05-19 04:14:41 C 08 05 05.85 +35 37 17.9 u 703
2013-05-19 04:21:57 C 08 05 06.25 +35 37 08.7 u 703
2013-05-19 04:29:16 C 08 05 06.86 +35 37 02.5 u 703
2013-05-19 04:36:29 C 08 05 07.33 +35 36 55.2 u 703
2013-05-19 04:43:46 C 08 05 07.72 +35 36 47.3 u 703
2013-10-17 00:25:30 C 20 13 34.99 -06 22 24.6 u H21
2013-10-17 00:32:11 C 20 13 36.43 -06 22 02.4 u H21
2013-10-17 00:34:37 C 20 13 36.96 -06 21 54.4 u H21
2013-10-17 00:38:49 C 20 13 37.86 -06 21 40.4 u H21
2013-10-17 00:41:36 C 20 13 38.46 -06 21 31.1 u H21
2013-10-17 00:43:20 C 20 13 38.83 -06 21 25.4 u H21
2013-10-20 00:57:24 C 20 28 11.78 -02 43 11.2 u H21
2013-10-20 01:07:24 C 20 28 13.57 -02 42 43.8 u H21
2013-10-20 01:12:36 C 20 28 14.51 -02 42 29.7 u H21
2013-10-20 01:16:54 C 20 28 15.29 -02 42 17.8 u H21
2013-10-20 01:19:33 C 20 28 15.77 -02 42 10.4 u H21
2013-10-20 01:23:01 C 20 28 16.39 -02 42 00.9 u H21
2013-10-21 01:28:40 C 20 32 36.04 -01 37 54.5 q H45
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)