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
2025-04-11 04:04:57 C 07 25 48.738 +38 14 41.93 V 703
2025-04-11 04:08:15 C 07 25 48.590 +38 14 35.20 V 703
2025-04-11 04:11:32 C 07 25 48.457 +38 14 27.74 V 703
2025-04-11 08:51:26 C 07 25 36.871 +38 04 31.22 V T08
2025-04-11 08:56:45 C 07 25 36.619 +38 04 19.34 V T08
2025-04-11 09:05:26 C 07 25 36.252 +38 03 59.94 V T08
2025-04-11 09:27:30 C 07 25 35.318 +38 03 13.97 V T08
2025-04-11 20:58:37 B 07 25 08.719 +37 38 39.84 W J51
2025-04-11 21:02:49 B 07 25 08.546 +37 38 30.59 W J51
2025-04-11 21:07:00 B 07 25 08.376 +37 38 21.23 W J51
2025-04-13 17:43:54 C 07 23 31.78 +36 02 45.0 X D04
2025-04-13 18:00:07 C 07 23 31.18 +36 02 10.7 X D04
2025-04-13 18:07:15 B 07 23 30.96 +36 01 54.4 X L76
2025-04-13 18:16:19 C 07 23 30.56 +36 01 34.7 X D04
2025-04-13 18:17:42 B 07 23 30.58 +36 01 31.6 X L76
2025-04-13 18:28:07 B 07 23 30.20 +36 01 09.1 X L76
2025-04-14 06:49:24 C 07 23 05.659 +35 34 42.42 V T08
2025-04-14 06:53:27 C 07 23 05.496 +35 34 33.46 V T08
2025-04-14 07:06:17 C 07 23 05.042 +35 34 05.74 V T08
2025-04-14 07:21:04 C 07 23 04.517 +35 33 33.91 V T08
2025-04-14 17:35:24 B 07 22 45.26 +35 11 28.2 X L76
2025-04-14 17:43:15 B 07 22 44.99 +35 11 10.9 X L76
2025-04-14 17:51:05 B 07 22 44.72 +35 10 54.1 X L76
2025-04-14 17:58:54 B 07 22 44.47 +35 10 37.3 X L76
2025-04-14 18:46:58 C 07 22 42.82 +35 08 53.3 X D04
2025-04-14 18:59:31 C 07 22 42.38 +35 08 26.5 X D04
2025-04-14 19:11:54 C 07 22 41.98 +35 07 59.7 X D04
2025-04-14 20:00:42 C 07 22 40.702 +35 06 14.62 Z C23
2025-04-14 20:28:54 C 07 22 39.794 +35 05 13.81 Z C23
2025-04-14 21:27:19 C 07 22 37.70 +35 03 04.4 X C40
2025-04-14 21:28:16 C 07 22 37.867 +35 03 05.26 Z C23
2025-04-14 21:35:21 C 07 22 37.42 +35 02 47.0 X C40
2025-04-14 21:43:24 C 07 22 37.28 +35 02 29.5 X C40
2025-04-15 06:49:29 C 07 22 20.645 +34 43 03.86 V T08
2025-04-15 06:55:36 C 07 22 20.441 +34 42 50.33 V T08
2025-04-15 07:03:48 C 07 22 20.174 +34 42 32.69 V T08
2025-04-15 07:27:02 C 07 22 19.411 +34 41 42.22 V T08
2025-04-16 04:15:17 C 07 21 43.146 +33 56 49.06 V 703
2025-04-16 04:18:38 C 07 21 43.042 +33 56 41.64 V 703
2025-04-16 04:21:58 C 07 21 42.948 +33 56 34.37 V 703
2025-04-16 04:25:19 C 07 21 42.833 +33 56 27.10 V 703
2025-04-16 06:32:11 C 07 21 39.377 +33 51 56.45 V T05
2025-04-16 06:36:49 C 07 21 39.233 +33 51 46.30 V T05
2025-04-16 06:57:37 C 07 21 38.582 +33 51 01.01 V T05
2025-04-16 07:05:44 C 07 21 38.326 +33 50 43.48 V T05
2025-04-16 17:47:39 B 07 21 20.85 +33 27 32.6 X L76
2025-04-16 17:58:09 B 07 21 20.54 +33 27 09.9 X L76
2025-04-16 18:07:11 C 07 21 20.28 +33 26 49.7 X D04
2025-04-16 18:08:38 B 07 21 20.25 +33 26 47.1 X L76
2025-04-16 18:19:43 C 07 21 19.88 +33 26 24.0 X D04
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)