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
2006-08-28 10:37:50 C 04 57 49.06 +15 34 27.3 c 704
2006-08-28 10:53:30 C 04 57 45.58 +15 35 31.4 c 704
2006-08-29 10:43:03 C 04 52 26.50 +17 11 31.7 r 703
2006-08-29 10:54:01 C 04 52 23.91 +17 12 15.9 r 703
2006-08-29 11:05:00 C 04 52 21.36 +17 13 00.6 r 703
2006-08-29 11:16:01 C 04 52 18.80 +17 13 45.8 r 703
2006-08-31 09:44:09 C 04 41 22.47 +20 23 46.3 c 704
2006-08-31 10:00:16 C 04 41 18.45 +20 24 52.9 c 704
2006-08-31 10:16:16 C 04 41 14.50 +20 25 59.2 c 704
2006-08-31 10:32:23 C 04 41 10.47 +20 27 06.1 c 704
2006-08-31 10:48:22 C 04 41 06.47 +20 28 12.3 c 704
2006-09-01 09:44:38 C 04 35 24.38 +22 02 46.9 c 704
2006-09-01 10:00:43 C 04 35 20.23 +22 03 53.9 c 704
2006-09-01 10:16:48 C 04 35 16.08 +22 05 01.0 c 704
2006-09-01 10:33:02 C 04 35 11.88 +22 06 08.2 c 704
2006-09-01 10:49:08 C 04 35 07.72 +22 07 15.1 c 704
2006-09-04 00:40:14 C 04 18 38.06 +26 21 48.6 15.3 r 084
2006-09-04 00:41:42 C 04 18 37.67 +26 21 54.3 15.2 r 084
2006-09-10 21:22:48 C 03 26 11.07 +36 50 52.4 15.4 r 084
2006-09-10 21:24:16 C 03 26 10.55 +36 50 57.4 15.3 r 084
2006-09-11 21:47:45 C 03 17 20.14 +38 12 03.0 14.8 r 084
2006-09-11 21:49:14 C 03 17 19.63 +38 12 07.5 15.0 r 084
2006-09-12 20:42:53 C 03 08 48.24 +39 24 16.2 15.1 r 084
2006-09-12 21:15:24 C 03 08 35.96 +39 25 56.6 14.8 r 084
2006-09-12 21:16:52 C 03 08 35.39 +39 26 01.1 14.8 r 084
2006-09-12 21:22:38 C 03 08 33.23 +39 26 19.0 14.7 r 084
2006-09-12 21:29:39 C 03 08 30.58 +39 26 40.7 14.9 r 084
2006-09-13 21:25:12 C 02 59 23.13 +40 37 34.0 r 113
2006-09-13 21:26:28 C 02 59 22.64 +40 37 37.5 r 113
2006-09-13 21:27:38 C 02 59 22.19 +40 37 41.1 r 113
2006-09-13 21:28:49 C 02 59 21.74 +40 37 44.4 r 113
2006-09-13 21:29:59 C 02 59 21.28 +40 37 47.8 r 113
2006-09-15 23:56:11 C 02 39 29.10 +42 51 26.2 15.5 r 084
2006-09-15 23:57:40 C 02 39 28.50 +42 51 29.7 15.5 r 084
2006-09-16 22:15:44 C 02 30 30.31 +43 43 19.4 15.0 r 084
2006-09-17 07:21:32 C 02 26 49.69 +44 03 20.8 c 704
2006-09-17 07:38:48 C 02 26 42.57 +44 03 58.5 c 704
2006-09-17 07:55:58 C 02 26 35.45 +44 04 35.5 c 704
2006-09-17 08:13:13 C 02 26 28.32 +44 05 12.7 c 704
2006-09-17 08:30:22 C 02 26 21.32 +44 05 49.6 c 704
2006-09-17 20:36:45 C 02 21 26.08 +44 30 41.0 15.2 r 084
2006-09-17 20:38:13 C 02 21 25.46 +44 30 44.2 15.3 r 084
2006-09-19 22:09:11 C 02 01 12.73 +45 59 23.4 c J93
2006-09-19 22:12:12 C 02 01 11.53 +45 59 28.2 c J93
2006-09-19 22:18:17 C 02 01 09.01 +45 59 37.8 c J93
2006-09-19 22:21:19 C 02 01 07.77 +45 59 42.8 c J93
2006-09-20 19:46:12 C 01 52 25.15 +46 31 01.3 r 113
2006-09-20 19:46:54 C 01 52 24.88 +46 31 02.2 r 113
2006-09-20 19:47:34 C 01 52 24.60 +46 31 03.2 r 113
2006-09-20 19:48:14 C 01 52 24.32 +46 31 04.1 r 113
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)