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
2025-02-15 13:44:31 C 11 17 10.879 +62 14 01.14 V T08
2025-02-17 08:17:05 C 11 08 37.144 +62 37 14.41 V 703
2025-02-17 08:20:28 C 11 08 36.384 +62 37 15.60 V 703
2025-02-17 08:23:50 C 11 08 35.657 +62 37 17.98 V 703
2025-02-17 08:27:13 C 11 08 34.940 +62 37 19.60 V 703
2025-02-17 12:08:49 C 11 07 48.262 +62 39 12.46 V T05
2025-02-17 12:58:33 C 11 07 37.529 +62 39 36.76 V T05
2025-02-17 13:38:35 C 11 07 28.867 +62 39 56.02 V T05
2025-02-17 14:14:16 C 11 07 21.182 +62 40 12.97 V T05
2025-02-19 07:40:20 C 10 58 20.334 +62 58 57.25 V 703
2025-02-19 07:43:42 C 10 58 19.556 +62 58 58.94 V 703
2025-02-19 07:47:05 C 10 58 18.800 +62 59 00.31 V 703
2025-02-19 07:50:27 C 10 58 17.983 +62 59 01.57 V 703
2025-02-19 10:25:52 C 10 57 43.157 +63 00 05.94 V T08
2025-02-19 10:28:31 C 10 57 42.550 +63 00 06.95 V T08
2025-02-19 10:35:48 C 10 57 40.860 +63 00 10.04 V T08
2025-02-19 11:02:38 C 10 57 34.656 +63 00 20.81 V T08
2025-02-21 07:07:58 C 10 47 19.367 +63 15 38.09 V 703
2025-02-21 07:11:27 C 10 47 18.535 +63 15 38.92 V 703
2025-02-21 07:14:57 C 10 47 17.686 +63 15 40.18 V 703
2025-02-21 07:18:26 C 10 47 16.832 +63 15 41.11 V 703
2025-02-21 10:13:02 C 10 46 35.038 +63 16 32.95 V T05
2025-02-21 10:16:18 C 10 46 34.236 +63 16 33.92 V T05
2025-02-21 10:20:54 C 10 46 33.110 +63 16 35.22 V T05
2025-02-21 10:30:48 C 10 46 30.682 +63 16 38.14 V T05
2025-02-22 13:01:12 C 10 40 02.035 +63 23 13.31 V T05
2025-02-22 13:09:37 C 10 39 59.923 +63 23 15.11 V T05
2025-02-22 13:29:33 C 10 39 54.900 +63 23 18.85 V T05
2025-02-23 06:38:16 C 10 35 39.440 +63 26 32.35 V 703
2025-02-23 06:41:45 C 10 35 38.526 +63 26 32.89 V 703
2025-02-23 06:45:14 C 10 35 37.612 +63 26 33.65 V 703
2025-02-23 06:48:43 C 10 35 36.755 +63 26 34.22 V 703
2025-02-23 11:37:39 C 10 34 23.244 +63 27 21.17 V T08
2025-02-23 11:45:38 C 10 34 21.175 +63 27 22.39 V T08
2025-02-23 11:49:39 C 10 34 20.141 +63 27 23.00 V T08
2025-02-23 12:38:10 C 10 34 07.594 +63 27 29.41 V T08
2025-02-24 07:48:45 C 10 29 15.758 +63 29 44.99 V T08
2025-02-24 07:57:04 C 10 29 13.579 +63 29 46.00 V T08
2025-02-24 07:59:54 C 10 29 12.830 +63 29 46.10 V T05
2025-02-24 08:09:13 C 10 29 10.406 +63 29 47.11 V T05
2025-02-25 08:44:37 C 10 22 46.232 +63 31 03.43 V 703
2025-02-25 08:48:00 C 10 22 45.325 +63 31 03.83 V 703
2025-02-25 08:51:22 C 10 22 44.393 +63 31 03.79 V 703
2025-02-25 08:54:45 C 10 22 43.525 +63 31 03.83 V 703
2025-02-25 11:15:52 C 10 22 06.758 +63 31 07.21 V T05
2025-02-25 11:20:30 C 10 22 05.508 +63 31 07.10 V T05
2025-02-25 12:09:41 C 10 21 52.303 +63 31 06.67 V T05
2025-02-25 12:50:35 C 10 21 41.347 +63 31 06.13 V T05
2025-02-27 00:11:54 C 10 12 20.486 +63 29 10.00 V R17
2025-02-27 00:33:42 C 10 12 14.532 +63 29 07.66 V R17
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)