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
2013-11-26 18:28:42 C 22 04 08.25 +15 57 56.9 c A24
2013-11-26 19:29:49 C 22 04 12.66 +15 58 33.1 c A24
2013-11-26 19:30:51 C 22 04 12.89 +15 58 34.4 c A24
2013-11-29 17:19:59 C 22 09 29.36 +16 39 11.9 i C91
2013-11-29 17:24:59 C 22 09 29.74 +16 39 15.1 i C91
2013-11-29 17:32:59 C 22 09 30.31 +16 39 18.9 i C91
2013-11-29 17:37:00 C 22 09 30.62 +16 39 21.6 i C91
2013-12-30 19:00:08 C 23 02 59.39 +22 35 14.9 q 046
2013-12-30 19:04:22 C 23 02 59.74 +22 35 15.2 q 046
2013-12-30 19:08:25 C 23 02 59.97 +22 35 18.5 q 046
2013-12-30 19:12:26 C 23 03 00.44 +22 35 19.4 q 046
2014-11-12 14:32:21 C 08 43 04.871 +70 31 25.71 L F51
2014-11-12 14:47:50 C 08 43 05.028 +70 31 34.97 L F51
2014-11-12 15:18:50 C 08 43 05.281 +70 31 53.51 L F51
2014-12-10 12:42:21 C 08 07 49.065 +77 12 51.74 L F51
2014-12-10 13:18:40 C 08 07 43.666 +77 13 10.42 L F51
2014-12-10 13:36:50 C 08 07 40.928 +77 13 19.62 L F51
2015-01-23 20:24:15 C 04 30 35.83 +75 28 39.5 v 587
2015-01-23 20:25:50 C 04 30 35.60 +75 28 38.5 v 587
2015-01-23 20:32:33 C 04 30 34.82 +75 28 34.4 v 587
2015-01-31 07:17:19 C 04 19 08.085 +73 33 09.76 L F51
2015-01-31 07:37:24 C 04 19 07.187 +73 32 56.35 L F51
2015-01-31 07:57:31 C 04 19 06.268 +73 32 42.81 L F51
2015-02-24 05:40:50 C 04 21 30.822 +67 19 16.37 L F51
2015-02-24 06:01:12 C 04 21 31.543 +67 19 03.32 L F51
2015-02-24 06:21:27 C 04 21 32.235 +67 18 51.08 L F51
2015-02-24 06:41:19 C 04 21 32.914 +67 18 38.58 L F51
2017-12-09 10:29:36 C 12 22 17.15 +34 53 44.8 U G96
2017-12-09 10:37:00 C 12 22 17.63 +34 53 43.8 U G96
2017-12-09 10:44:24 C 12 22 18.10 +34 53 42.8 U G96
2017-12-09 10:51:48 C 12 22 18.60 +34 53 42.0 U G96
2017-12-14 11:16:27 C 12 30 05.54 +34 39 05.8 U 703
2017-12-14 11:24:02 C 12 30 06.03 +34 39 05.9 U 703
2017-12-14 11:31:37 C 12 30 06.40 +34 39 04.7 U 703
2017-12-14 11:39:12 C 12 30 06.88 +34 39 03.6 U 703
2017-12-14 11:47:26 C 12 30 07.42 +34 39 03.2 U 703
2017-12-14 11:55:00 C 12 30 07.96 +34 39 02.6 U 703
2017-12-14 12:02:32 C 12 30 08.35 +34 39 01.3 U 703
2017-12-14 12:10:04 C 12 30 08.84 +34 39 00.9 U 703
2017-12-25 12:20:26 C 12 46 28.34 +34 18 57.8 U 703
2017-12-25 12:28:03 C 12 46 28.79 +34 18 57.7 U 703
2017-12-25 12:35:42 C 12 46 29.27 +34 18 57.8 U 703
2017-12-25 12:43:20 C 12 46 29.69 +34 18 57.3 U 703
2017-12-28 11:53:17 C 12 50 41.32 +34 16 39.5 U 703
2017-12-28 11:59:53 C 12 50 41.73 +34 16 39.6 U 703
2017-12-28 12:01:08 C 12 50 41.74 +34 16 40.2 U 703
2017-12-28 12:07:43 C 12 50 42.16 +34 16 38.7 U 703
2017-12-28 12:08:58 C 12 50 42.29 +34 16 39.1 U 703
2017-12-28 12:15:34 C 12 50 42.64 +34 16 38.7 U 703
2017-12-28 12:16:49 C 12 50 42.73 +34 16 38.0 U 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)