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
1999-04-01 20:14:15 C 07 28 12.00 +40 40 55.7 b 118
1999-04-01 20:17:23 C 07 28 11.50 +40 40 46.4 b 118
1999-04-01 20:18:43 C 07 28 11.28 +40 40 42.5 b 118
1999-04-06 03:13:20 C 07 13 37.23 +35 28 25.4 a 704
1999-04-06 03:21:24 C 07 13 36.14 +35 28 00.5 z 719
1999-04-06 03:29:44 C 07 13 35.01 +35 27 34.3 a 704
1999-04-06 03:45:58 C 07 13 32.86 +35 26 44.3 a 704
1999-04-06 04:02:05 C 07 13 30.71 +35 25 54.3 a 704
1999-04-06 04:18:10 C 07 13 28.66 +35 25 04.6 a 704
1999-04-06 04:46:20 C 07 13 24.84 +35 23 35.6 z 719
1999-04-06 19:14:26 C 07 11 35.52 +34 38 39.0 b 118
1999-04-06 19:19:39 C 07 11 34.88 +34 38 22.7 b 118
1999-04-09 04:23:38 C 07 04 47.28 +31 39 55.5 z 719
1999-04-09 05:34:56 C 07 04 38.86 +31 36 08.4 z 719
1999-04-13 02:20:05 C 06 54 51.77 +26 43 20.6 z 712
1999-04-13 02:22:31 C 06 54 51.67 +26 43 14.2 z 712
1999-04-13 02:29:49 C 06 54 50.90 +26 42 49.9 z 712
1999-04-13 02:37:05 C 06 54 50.06 +26 42 27.5 z 712
1999-10-30 04:06:55 C 00 03 44.09 +56 14 21.9 18.5 a 704
1999-10-30 04:30:44 C 00 03 41.45 +56 14 06.3 19.5 a 704
1999-10-30 04:54:30 C 00 03 38.64 +56 13 50.1 19.7 a 704
1999-10-30 05:18:11 C 00 03 35.89 +56 13 33.8 19.5 a 704
1999-10-30 05:41:47 C 00 03 33.11 +56 13 17.4 18.9 a 704
2002-12-21 06:58:44 C 04 07 39.13 +78 16 52.9 c 649
2002-12-21 07:22:35 C 04 07 33.45 +78 16 44.7 c 649
2003-12-23 11:21:50 C 14 11 22.44 -04 49 23.5 c 704
2003-12-23 11:40:30 C 14 11 25.05 -04 49 57.3 c 704
2003-12-23 12:18:05 C 14 11 30.09 -04 51 02.3 c 704
2003-12-23 12:36:44 C 14 11 32.71 -04 51 36.6 c 704
2005-12-10 11:10:15 C 11 39 37.83 +51 29 42.2 r 703
2005-12-10 11:21:18 C 11 39 38.34 +51 29 45.0 r 703
2005-12-10 11:32:20 C 11 39 38.80 +51 29 49.4 r 703
2006-01-22 23:03:04 C 11 39 19.09 +62 14 40.4 o A74
2006-01-22 23:04:06 C 11 39 18.98 +62 14 41.1 o A74
2006-01-22 23:08:18 C 11 39 18.73 +62 14 44.3 o A74
2006-01-22 23:13:31 C 11 39 18.28 +62 14 48.6 o A74
2006-01-22 23:14:34 C 11 39 18.18 +62 14 49.5 o A74
2006-01-22 23:17:42 C 11 39 17.94 +62 14 51.8 o A74
2006-02-02 09:32:55 C 11 11 58.20 +65 17 17.0 r 703
2006-02-02 09:42:48 C 11 11 56.79 +65 17 23.1 r 703
2006-02-02 09:52:38 C 11 11 55.32 +65 17 29.8 r 703
2006-02-02 10:02:29 C 11 11 53.84 +65 17 36.0 r 703
2006-02-10 06:17:27 C 10 39 22.58 +66 57 44.4 o 699
2006-02-10 06:45:43 C 10 39 17.00 +66 57 55.9 o 699
2006-02-10 07:13:59 C 10 39 11.20 +66 58 08.0 o 699
2006-02-15 06:30:00 C 10 13 44.63 +67 31 08.6 o 699
2006-02-15 06:56:35 C 10 13 38.55 +67 31 13.2 o 699
2006-02-15 07:23:09 C 10 13 32.53 +67 31 17.6 o 699
2006-02-15 07:49:45 C 10 13 26.38 +67 31 21.0 o 699
2006-02-27 00:43:04 C 09 08 27.01 +66 40 41.3 o A32
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)