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
2006-02-27 00:50:58 C 09 08 25.23 +66 40 37.1 o A32
2006-02-27 00:58:53 C 09 08 23.46 +66 40 33.2 o A32
2006-03-17 21:40:14 C 07 55 37.31 +59 31 00.6 o 084
2006-03-17 21:44:22 C 07 55 36.88 +59 30 55.7 o 084
2006-03-22 19:41:55 C 07 45 56.41 +56 56 35.0 o 084
2006-03-22 19:46:04 C 07 45 56.20 +56 56 29.6 o 084
2006-03-30 20:07:29 C 07 36 31.64 +52 27 57.3 c 434
2006-03-30 20:10:43 C 07 36 31.67 +52 27 52.8 c 434
2006-03-30 20:13:43 C 07 36 31.56 +52 27 48.3 c 434
2006-03-30 20:16:13 C 07 36 31.52 +52 27 44.9 c 434
2006-04-08 20:15:44 C 07 33 03.44 +47 13 36.8 18.0 c 130
2006-04-08 20:17:54 C 07 33 03.42 +47 13 33.4 18.1 c 130
2006-04-08 20:20:04 C 07 33 03.39 +47 13 30.3 18.1 c 130
2006-04-08 20:22:35 C 07 33 03.36 +47 13 26.4 18.0 c 130
2006-04-09 04:12:09 C 07 33 02.28 +47 01 58.0 c 704
2006-04-09 04:26:22 C 07 33 02.18 +47 01 37.0 c 704
2006-04-09 04:40:22 C 07 33 02.21 +47 01 15.9 c 704
2006-04-09 04:54:24 C 07 33 02.19 +47 00 54.2 c 704
2006-04-09 05:08:29 C 07 33 02.00 +47 00 34.3 c 704
2006-04-17 03:12:22 C 07 34 26.14 +42 19 39.2 c 704
2006-04-17 03:28:31 C 07 34 26.35 +42 19 14.8 c 704
2006-04-17 03:44:57 C 07 34 26.64 +42 18 50.0 c 704
2006-04-17 04:01:35 C 07 34 26.83 +42 18 25.2 c 704
2006-04-17 04:17:52 C 07 34 27.00 +42 18 00.9 c 704
2006-04-18 03:10:35 C 07 34 49.45 +41 44 03.5 c 704
2006-04-18 03:29:00 C 07 34 49.66 +41 43 36.4 c 704
2006-04-18 03:46:35 C 07 34 49.99 +41 43 09.6 c 704
2006-04-18 04:03:51 C 07 34 50.49 +41 42 45.1 c 704
2006-04-18 04:21:08 C 07 34 50.47 +41 42 17.7 c 704
2006-04-29 03:16:32 C 07 41 25.29 +35 09 15.4 r 703
2006-04-29 03:25:04 C 07 41 25.54 +35 09 02.5 r 703
2006-04-29 03:33:32 C 07 41 25.80 +35 08 49.9 r 703
2006-04-29 03:42:00 C 07 41 26.01 +35 08 37.5 r 703
2006-04-30 03:18:37 C 07 42 11.54 +34 33 01.6 c 704
2006-04-30 03:33:13 C 07 42 12.03 +34 32 39.2 c 704
2006-04-30 03:47:48 C 07 42 12.46 +34 32 17.3 c 704
2006-04-30 04:02:25 C 07 42 12.94 +34 31 54.8 c 704
2006-05-07 04:00:02 C 07 48 08.96 +30 16 24.8 r 703
2006-05-07 04:20:23 C 07 48 09.72 +30 15 53.4 r 703
2006-05-07 04:30:57 C 07 48 10.15 +30 15 37.2 r 703
2006-05-20 03:27:11 C 08 00 32.00 +22 06 31.4 r 703
2006-05-20 03:35:14 C 08 00 32.36 +22 06 18.6 r 703
2006-05-20 03:51:21 C 08 00 32.97 +22 05 52.3 r 703
2006-05-26 03:13:11 C 08 06 17.38 +18 09 54.0 r 703
2006-05-26 03:16:36 C 08 06 17.56 +18 09 47.7 r 703
2006-05-26 03:20:00 C 08 06 17.67 +18 09 42.6 r 703
2006-05-26 03:23:24 C 08 06 17.82 +18 09 37.5 r 703
2006-08-28 09:50:57 C 04 57 59.49 +15 31 17.5 c 704
2006-08-28 10:06:34 C 04 57 56.07 +15 32 21.5 c 704
2006-08-28 10:22:15 C 04 57 52.56 +15 33 24.3 c 704
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)