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
2006-09-20 19:48:56 C 01 52 24.03 +46 31 05.1 r 113
2006-09-20 21:45:31 C 01 51 36.53 +46 33 47.9 c 127
2006-09-20 21:50:31 C 01 51 34.50 +46 33 54.9 c 127
2006-09-20 21:54:04 C 01 51 33.05 +46 33 59.8 c 127
2006-09-20 22:02:30 C 01 51 29.58 +46 34 11.5 c 127
2006-09-20 22:06:33 C 01 51 27.93 +46 34 17.1 c 127
2006-09-20 23:06:43 C 01 51 02.65 +46 35 37.8 14.7 r 084
2006-09-21 19:24:19 C 01 42 52.28 +47 00 56.3 14.7 r 084
2006-09-21 19:25:48 C 01 42 51.64 +47 00 58.0 14.7 r 084
2006-09-21 19:36:05 C 01 42 47.95 +47 01 08.9 r A97
2006-09-21 19:51:10 C 01 42 41.94 +47 01 28.8 r A97
2006-09-21 19:58:48 C 01 42 38.83 +47 01 38.4 r A97
2006-09-21 20:11:32 C 01 42 33.71 +47 01 53.2 r A97
2006-09-21 20:20:41 C 01 42 30.02 +47 02 03.9 r A97
2006-09-21 20:55:25 C 01 42 15.42 +47 02 44.3 15.3 r 084
2006-09-21 21:27:32 C 01 42 02.98 +47 03 22.1 c 127
2006-09-21 21:31:47 C 01 42 01.26 +47 03 27.2 c 127
2006-09-21 21:35:47 C 01 41 59.65 +47 03 32.3 c 127
2006-09-21 21:42:06 C 01 41 57.20 +47 03 39.2 c 127
2006-09-21 21:46:47 C 01 41 55.22 +47 03 44.9 c 127
2006-09-22 20:07:08 C 01 33 01.79 +47 27 05.4 c J93
2006-09-22 20:08:40 C 01 33 01.20 +47 27 06.6 c J93
2006-09-22 20:10:14 C 01 33 00.49 +47 27 08.0 c J93
2006-09-22 20:25:20 C 01 32 53.99 +47 27 25.7 15.4 r 084
2006-09-22 20:26:48 C 01 32 53.38 +47 27 27.1 15.3 r 084
2006-09-23 20:22:08 C 01 23 31.64 +47 47 57.1 15.7 r 084
2006-09-23 20:23:35 C 01 23 31.11 +47 47 58.1 15.8 r 084
2006-09-24 20:29:00 C 01 14 18.24 +48 04 09.9 r A97
2006-09-24 20:40:03 C 01 14 13.99 +48 04 16.6 r A97
2006-09-24 20:48:41 C 01 14 10.68 +48 04 21.8 r A97
2006-09-24 20:55:08 C 01 14 08.20 +48 04 25.7 r A97
2006-09-25 19:44:04 C 01 05 38.09 +48 15 40.8 c J93
2006-09-25 19:51:28 C 01 05 35.31 +48 15 43.8 c J93
2006-09-25 19:53:55 C 01 05 34.43 +48 15 44.7 c J93
2006-09-25 22:06:29 C 01 04 44.64 +48 16 43.0 15.9 r 084
2006-09-25 22:07:58 C 01 04 44.10 +48 16 43.6 15.8 r 084
2006-09-26 20:08:03 C 00 56 47.61 +48 23 56.4 15.4 r 084
2006-09-26 20:09:31 C 00 56 47.09 +48 23 56.9 15.4 r 084
2006-09-27 19:18:58 C 00 48 41.22 +48 28 17.2 15.4 r 084
2006-09-27 19:20:27 C 00 48 40.70 +48 28 17.5 15.5 r 084
2006-09-28 20:46:25 C 00 40 06.60 +48 29 34.5 16.1 r 084
2006-09-29 23:16:37 C 00 31 34.60 +48 27 26.4 o 493
2006-09-29 23:21:53 C 00 31 32.71 +48 27 23.0 c A41
2006-09-29 23:59:47 C 00 31 20.59 +48 27 17.0 c A41
2006-09-30 00:01:05 C 00 31 20.74 +48 27 20.3 o 493
2006-09-30 00:34:50 C 00 31 09.77 +48 27 15.0 o 493
2006-09-30 19:55:37 C 00 25 14.03 +48 23 19.7 o 493
2006-09-30 20:54:33 C 00 24 56.05 +48 23 07.9 o 493
2006-09-30 21:38:04 C 00 24 42.73 +48 22 58.5 o 493
2006-10-01 20:06:26 C 00 18 06.50 +48 16 24.2 o 493
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)