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
2025-02-04 07:49:56 C 11 56 57.851 +58 54 59.47 V 703
2025-02-04 07:53:09 C 11 56 57.534 +58 55 01.99 V 703
2025-02-04 07:56:22 C 11 56 57.174 +58 55 04.87 V 703
2025-02-04 20:10:07 C 11 55 40.030 +59 05 06.43 X M26
2025-02-04 20:15:07 C 11 55 39.494 +59 05 10.25 X M26
2025-02-04 20:19:48 C 11 55 38.978 +59 05 14.78 X M26
2025-02-05 09:06:54 C 11 54 15.362 +59 15 50.40 V T08
2025-02-05 09:22:22 C 11 54 13.634 +59 16 03.47 V T08
2025-02-05 09:25:05 C 11 54 13.296 +59 16 05.56 V T05
2025-02-05 09:38:04 C 11 54 11.832 +59 16 16.36 V T05
2025-02-06 07:13:00 C 11 51 43.222 +59 33 52.67 V 703
2025-02-06 07:16:13 C 11 51 42.865 +59 33 55.55 V 703
2025-02-06 07:19:26 C 11 51 42.473 +59 33 58.18 V 703
2025-02-06 07:22:38 C 11 51 42.113 +59 34 00.44 V 703
2025-02-07 23:12:21 C 11 46 44.78 +60 05 50.7 V M31
2025-02-07 23:14:24 C 11 46 44.53 +60 05 52.4 V M31
2025-02-07 23:16:28 C 11 46 44.32 +60 05 54.0 V M31
2025-02-07 23:18:33 C 11 46 43.97 +60 05 55.4 V M31
2025-02-07 23:20:36 C 11 46 43.66 +60 05 57.2 V M31
2025-02-07 23:22:41 C 11 46 43.41 +60 05 59.1 V M31
2025-02-07 23:24:45 C 11 46 43.09 +60 06 00.9 V M31
2025-02-07 23:26:50 C 11 46 42.75 +60 06 02.5 V M31
2025-02-07 23:28:53 C 11 46 42.47 +60 06 04.2 V M31
2025-02-07 23:30:58 C 11 46 42.31 +60 06 05.1 V M31
2025-02-07 23:33:01 C 11 46 42.06 +60 06 07.2 V M31
2025-02-08 06:36:39 C 11 45 46.807 +60 11 42.61 V 703
2025-02-08 06:40:09 C 11 45 46.271 +60 11 44.70 V 703
2025-02-08 06:43:38 C 11 45 45.799 +60 11 48.08 V 703
2025-02-08 06:47:07 C 11 45 45.342 +60 11 51.00 V 703
2025-02-08 08:35:54 C 11 45 30.798 +60 13 14.88 V 703
2025-02-08 08:42:54 C 11 45 29.542 +60 13 23.27 V 703
2025-02-08 08:46:24 C 11 45 28.926 +60 13 27.91 V 703
2025-02-11 06:14:24 C 11 35 23.204 +61 05 49.13 V 703
2025-02-11 06:17:38 C 11 35 22.621 +61 05 50.86 V 703
2025-02-11 06:20:51 C 11 35 22.157 +61 05 54.02 V 703
2025-02-11 06:24:05 C 11 35 21.642 +61 05 56.08 V 703
2025-02-11 10:19:34 C 11 34 44.323 +61 08 48.48 V T08
2025-02-11 10:22:13 C 11 34 43.853 +61 08 50.46 V T08
2025-02-11 10:36:25 C 11 34 41.477 +61 09 01.48 V T08
2025-02-11 10:41:50 C 11 34 40.632 +61 09 04.72 V T08
2025-02-11 11:09:26 C 11 34 36.118 +61 09 24.70 V T08
2025-02-11 11:12:05 C 11 34 35.654 +61 09 27.00 V T08
2025-02-11 11:18:55 C 11 34 34.567 +61 09 32.29 V T08
2025-02-11 11:27:04 C 11 34 33.211 +61 09 37.84 V T08
2025-02-13 11:13:26 C 11 26 32.866 +61 42 33.84 V T05
2025-02-13 11:16:03 C 11 26 32.342 +61 42 35.21 V T05
2025-02-13 11:20:40 C 11 26 31.524 +61 42 38.66 V T05
2025-02-13 11:54:26 C 11 26 25.399 +61 43 00.95 V T05
2025-02-15 13:32:25 C 11 17 13.313 +62 13 54.01 V T08
2025-02-15 13:36:28 C 11 17 12.473 +62 13 56.78 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)