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
2025-04-06 06:26:39 C 07 31 32.011 +42 23 19.57 V T08
2025-04-06 06:34:14 C 07 31 31.543 +42 23 03.66 V T08
2025-04-06 06:42:34 C 07 31 31.049 +42 22 46.06 V T08
2025-04-06 06:49:12 C 07 31 30.624 +42 22 32.12 V T08
2025-04-06 17:18:30 B 07 30 54.962 +42 00 33.66 Z M69
2025-04-06 17:26:09 B 07 30 54.518 +42 00 17.57 Z M69
2025-04-06 17:33:49 B 07 30 54.058 +42 00 01.37 Z M69
2025-04-06 19:35:31 B 07 30 47.640 +41 55 41.92 X K87
2025-04-06 19:38:42 B 07 30 47.472 +41 55 35.40 X K87
2025-04-06 19:41:52 B 07 30 47.278 +41 55 28.70 X K87
2025-04-06 19:44:29 C 07 30 46.80 +41 55 22.2 X C40
2025-04-06 19:54:46 C 07 30 46.19 +41 55 00.6 X C40
2025-04-06 20:05:36 C 07 30 45.61 +41 54 37.9 X C40
2025-04-07 18:44:54 C 07 29 33.14 +41 07 03.9 X D04
2025-04-07 19:03:02 C 07 29 32.14 +41 06 24.5 X D04
2025-04-07 19:20:54 C 07 29 31.10 +41 05 46.4 X D04
2025-04-07 21:09:44 C 07 29 25.726 +41 01 56.71 Z C23
2025-04-07 21:36:19 C 07 29 24.288 +41 01 00.30 Z C23
2025-04-08 03:56:04 C 07 29 05.050 +40 47 44.99 V 703
2025-04-08 03:59:23 C 07 29 04.877 +40 47 37.61 V 703
2025-04-08 04:02:42 C 07 29 04.711 +40 47 30.44 V 703
2025-04-08 04:06:00 C 07 29 04.477 +40 47 23.86 V 703
2025-04-08 06:48:41 C 07 28 56.354 +40 41 43.04 V T08
2025-04-08 06:53:18 C 07 28 56.105 +40 41 33.14 V T08
2025-04-08 07:01:16 C 07 28 55.697 +40 41 16.26 V T08
2025-04-08 07:24:38 C 07 28 54.437 +40 40 26.69 V T08
2025-04-08 19:09:09 B 07 28 20.285 +40 15 34.38 V 160
2025-04-08 19:15:50 B 07 28 19.901 +40 15 20.88 V 160
2025-04-08 19:44:29 B 07 28 18.578 +40 14 19.39 q M04
2025-04-08 20:05:21 B 07 28 17.470 +40 13 35.98 q M04
2025-04-08 20:25:03 B 07 28 16.534 +40 12 54.72 q M04
2025-04-08 20:37:51 B 07 28 15.857 +40 12 26.68 q M04
2025-04-09 03:57:48 C 07 27 54.958 +39 56 57.88 V 703
2025-04-09 04:01:05 C 07 27 54.817 +39 56 50.53 V 703
2025-04-09 04:04:23 C 07 27 54.619 +39 56 43.22 V 703
2025-04-09 04:07:41 C 07 27 54.486 +39 56 36.38 V 703
2025-04-09 08:34:06 C 07 27 41.758 +39 47 12.30 V T05
2025-04-09 08:41:52 C 07 27 41.374 +39 46 55.78 V T05
2025-04-09 08:48:02 C 07 27 41.081 +39 46 42.42 V T05
2025-04-09 09:21:00 C 07 27 39.470 +39 45 31.64 V T05
2025-04-10 04:44:22 C 07 26 47.602 +39 04 22.98 V 703
2025-04-10 04:47:41 C 07 26 47.425 +39 04 15.85 V 703
2025-04-10 04:51:00 C 07 26 47.260 +39 04 08.76 V 703
2025-04-10 04:54:19 C 07 26 47.137 +39 04 01.31 V 703
2025-04-10 20:44:58 C 07 26 06.946 +38 30 15.52 Z C23
2025-04-10 21:37:54 C 07 26 04.673 +38 28 22.12 Z C23
2025-04-11 01:14:28 C 07 25 55.843 +38 20 42.07 q X04
2025-04-11 01:46:24 C 07 25 54.430 +38 19 33.74 q X04
2025-04-11 02:17:58 C 07 25 53.095 +38 18 26.03 q X04
2025-04-11 04:01:40 C 07 25 48.875 +38 14 48.95 V 703
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)