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
2006-10-01 20:44:21 C 00 17 55.41 +48 16 12.6 o 493
2006-10-01 21:24:06 C 00 17 43.68 +48 16 00.4 o 493
2006-10-06 22:45:09 C 23 47 13.29 +47 13 03.6 16.1 r 084
2006-10-06 22:46:37 C 23 47 12.97 +47 13 02.5 16.1 r 084
2006-10-08 18:40:27 C 23 38 13.49 +46 42 40.5 r 113
2006-10-08 18:41:49 C 23 38 13.21 +46 42 40.0 r 113
2006-10-08 18:43:13 C 23 38 12.99 +46 42 39.0 r 113
2006-10-08 18:44:34 C 23 38 12.61 +46 42 37.9 r 113
2006-10-08 18:45:56 C 23 38 12.36 +46 42 36.8 r 113
2006-10-08 19:25:33 C 23 38 04.68 +46 42 09.2 r 240
2006-10-08 19:26:58 C 23 38 04.40 +46 42 08.1 r 240
2006-10-08 19:29:47 C 23 38 03.83 +46 42 06.1 r 240
2006-10-08 19:34:01 C 23 38 03.00 +46 42 03.1 r 240
2006-10-08 19:35:26 C 23 38 02.75 +46 42 02.3 r 240
2006-10-08 19:36:51 C 23 38 02.46 +46 42 01.2 r 240
2006-10-08 19:38:15 C 23 38 02.19 +46 42 00.3 r 240
2006-10-11 01:23:46 C 23 28 19.12 +46 01 32.1 r 204
2006-10-11 01:49:28 C 23 28 14.77 +46 01 11.5 r 204
2006-10-11 19:08:56 C 23 25 25.92 +45 47 38.6 16.0 r 084
2006-10-12 19:23:03 C 23 21 41.40 +45 28 23.5 16.4 r 084
2006-10-12 19:24:32 C 23 21 41.16 +45 28 22.2 16.4 r 084
2006-10-12 19:29:56 C 23 21 40.70 +45 28 19.8 r 240
2006-10-12 19:31:21 C 23 21 40.49 +45 28 18.6 r 240
2006-10-12 19:34:09 C 23 21 40.06 +45 28 16.5 r 240
2006-10-12 19:35:34 C 23 21 39.85 +45 28 15.6 r 240
2006-10-12 19:36:59 C 23 21 39.63 +45 28 14.2 r 240
2006-10-12 19:38:23 C 23 21 39.40 +45 28 13.3 r 240
2006-10-12 19:39:48 C 23 21 39.21 +45 28 12.3 r 240
2006-10-12 19:41:13 C 23 21 39.00 +45 28 11.0 r 240
2006-10-12 19:42:37 C 23 21 38.78 +45 28 10.0 r 240
2006-10-13 19:58:09 C 23 18 09.23 +45 08 40.0 r 170
2006-10-13 20:01:01 C 23 18 08.83 +45 08 37.6 r 170
2006-10-13 20:06:06 C 23 18 08.10 +45 08 33.7 r 170
2006-10-14 04:47:31 C 23 16 56.37 +45 01 33.6 c 704
2006-10-14 05:03:52 C 23 16 54.09 +45 01 20.3 c 704
2006-10-14 05:20:17 C 23 16 51.78 +45 01 06.9 c 704
2006-10-14 05:36:44 C 23 16 49.49 +45 00 53.5 c 704
2006-10-14 05:53:19 C 23 16 47.21 +45 00 39.7 c 704
2006-10-30 01:11:30 C 22 47 27.07 +40 09 26.7 16.0 r 084
2006-10-30 01:12:58 C 22 47 26.99 +40 09 25.8 15.9 r 084
2006-11-04 18:25:33 C 22 44 21.49 +38 43 28.8 15.1 r 084
2006-11-11 03:00:24 C 22 43 46.19 +37 22 15.8 17.9 447
2006-11-11 03:39:05 C 22 43 46.22 +37 21 56.1 17.7 447
2006-11-11 03:52:17 C 22 43 46.27 +37 21 50.3 17.7 447
2006-11-14 03:10:52 C 22 44 19.11 +36 48 53.8 c 704
2006-11-14 03:29:00 C 22 44 19.28 +36 48 45.4 c 704
2006-11-14 03:47:03 C 22 44 19.41 +36 48 37.8 c 704
2006-11-14 04:05:19 C 22 44 19.53 +36 48 29.6 c 704
2006-11-14 04:23:15 C 22 44 19.73 +36 48 21.4 c 704
2006-11-21 02:05:59 C 22 47 12.69 +35 43 31.5 r 703
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)