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
2025-07-29 14:38:55 C 04 15 12.131 +12 11 14.30 X F52
2025-07-29 14:45:29 C 04 15 11.898 +12 11 28.07 X F52
2025-08-02 03:32:55 C 04 12 32.182 +15 08 10.39 V M22
2025-08-02 04:02:28 C 04 12 31.193 +15 09 12.06 V M22
2025-08-02 04:07:11 C 04 12 31.034 +15 09 22.00 V M22
2025-08-02 04:11:21 C 04 12 30.895 +15 09 30.53 V M22
2025-08-02 14:28:26 C 04 12 12.288 +15 30 45.47 V T05
2025-08-02 14:34:23 C 04 12 12.098 +15 30 57.82 V T05
2025-08-02 14:45:07 C 04 12 11.748 +15 31 20.60 V T05
2025-08-02 15:02:04 C 04 12 11.162 +15 31 55.92 V T05
2025-08-03 04:35:14 C 04 11 46.462 +16 00 08.10 V R17
2025-08-03 04:52:05 C 04 11 45.912 +16 00 43.49 V R17
2025-08-03 05:07:11 C 04 11 45.432 +16 01 15.10 V R17
2025-08-03 05:21:57 C 04 11 44.950 +16 01 46.02 V R17
2025-08-03 14:20:19 C 04 11 28.622 +16 20 29.44 V T05
2025-08-03 14:26:13 C 04 11 28.428 +16 20 41.50 V T05
2025-08-03 14:54:55 C 04 11 27.494 +16 21 41.87 V T05
2025-08-03 15:09:36 C 04 11 27.019 +16 22 12.86 V T05
2025-08-04 14:13:25 C 04 10 44.921 +17 10 16.54 V T08
2025-08-04 14:18:47 C 04 10 44.755 +17 10 28.13 V T08
2025-08-04 14:31:31 C 04 10 44.335 +17 10 54.62 V T08
2025-08-04 14:42:17 C 04 10 43.973 +17 11 17.27 V T08
2025-08-05 14:28:59 C 04 10 00.331 +18 00 51.05 V T08
2025-08-05 14:54:08 C 04 09 59.503 +18 01 43.64 V T08
2025-08-05 14:59:55 C 04 09 59.309 +18 01 55.67 V T08
2025-08-05 15:06:48 C 04 09 59.078 +18 02 10.07 V T08
2025-08-06 04:22:27 C 04 09 34.718 +18 29 46.10 V R17
2025-08-06 04:37:54 C 04 09 34.229 +18 30 18.43 V R17
2025-08-06 04:48:44 C 04 09 33.859 +18 30 41.29 V R17
2025-08-06 05:08:20 C 04 09 33.206 +18 31 22.33 V R17
2025-08-06 14:22:42 C 04 09 16.090 +18 50 39.41 V T05
2025-08-06 14:37:36 C 04 09 15.595 +18 51 10.58 V T05
2025-08-06 14:53:04 C 04 09 15.070 +18 51 42.98 V T05
2025-08-06 15:03:11 C 04 09 14.738 +18 52 04.04 V T05
2025-08-07 14:27:12 C 04 08 30.905 +19 40 50.66 V T05
2025-08-07 14:34:37 C 04 08 30.658 +19 41 06.11 V T05
2025-08-07 14:54:30 C 04 08 29.974 +19 41 47.83 V T05
2025-08-07 15:03:13 C 04 08 29.678 +19 42 06.12 V T05
2025-08-09 14:23:08 C 04 06 58.450 +21 20 44.92 V T08
2025-08-09 14:47:58 C 04 06 57.564 +21 21 37.08 V T08
2025-08-09 14:55:37 C 04 06 57.288 +21 21 52.99 V T08
2025-08-09 15:05:03 C 04 06 56.950 +21 22 12.54 V T08
2025-08-10 14:13:02 C 04 06 10.850 +22 10 23.81 V T05
2025-08-10 14:18:30 C 04 06 10.654 +22 10 35.33 V T05
2025-08-10 14:43:02 C 04 06 09.756 +22 11 26.66 V T05
2025-08-10 14:57:11 C 04 06 09.245 +22 11 56.26 V T05
2025-08-11 03:50:50 C 04 05 43.116 +22 38 45.02 V R17
2025-08-11 04:10:21 C 04 05 42.403 +22 39 26.03 V R17
2025-08-11 04:25:31 C 04 05 41.863 +22 39 57.42 V R17
2025-08-11 04:41:24 C 04 05 41.254 +22 40 31.01 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)