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
2018-01-22 09:50:36 C 13 21 02.07 +35 02 23.5 U 703
2018-01-22 09:58:23 C 13 21 02.38 +35 02 25.3 U 703
2018-01-24 01:26:08 C 13 22 36.48 +35 10 19.7 q 160
2018-01-24 01:28:11 C 13 22 36.56 +35 10 20.3 q 160
2018-01-24 01:30:16 C 13 22 36.63 +35 10 20.3 q 160
2018-01-25 09:14:41 C 13 23 49.19 +35 17 17.3 U 703
2018-01-25 09:21:46 C 13 23 49.44 +35 17 18.9 U 703
2018-01-25 09:36:44 C 13 23 49.98 +35 17 22.5 U 703
2018-01-26 12:00:06 C 13 24 47.50 +35 23 30.4 U G96
2018-01-26 12:11:03 C 13 24 47.88 +35 23 33.4 U G96
2018-01-26 12:17:50 C 13 24 48.10 +35 23 35.0 U G96
2018-01-26 12:24:40 C 13 24 48.33 +35 23 36.6 U G96
2018-01-28 08:49:05 C 13 26 21.28 +35 34 39.7 U 703
2018-01-28 08:57:00 C 13 26 21.53 +35 34 41.8 U 703
2018-01-28 09:04:56 C 13 26 21.78 +35 34 44.0 U 703
2018-01-28 09:12:51 C 13 26 22.03 +35 34 46.3 U 703
2018-01-30 14:42:43 C 13 28 03.91 +35 49 33.1 U T05
2018-01-30 14:57:40 C 13 28 04.30 +35 49 37.6 U T05
2018-01-30 15:12:14 C 13 28 04.69 +35 49 41.7 U T05
2018-01-30 15:25:43 C 13 28 05.05 +35 49 45.6 U T05
2018-02-03 15:26:34 C 13 30 40.32 +36 20 16.2 U T05
2018-02-03 15:40:39 C 13 30 40.60 +36 20 21.0 U T05
2018-02-03 15:54:43 C 13 30 40.88 +36 20 25.9 U T05
2018-02-03 16:09:02 C 13 30 41.15 +36 20 30.6 U T05
2018-02-07 08:55:44 C 13 32 27.08 +36 53 51.1 U 703
2018-02-07 09:03:33 C 13 32 27.26 +36 53 57.0 U 703
2018-02-07 09:11:23 C 13 32 27.35 +36 54 00.2 U 703
2018-02-07 09:19:12 C 13 32 27.45 +36 54 03.6 U 703
2018-02-07 10:47:16 C 13 32 28.62 +36 54 40.3 U I41
2018-02-07 11:21:09 C 13 32 29.02 +36 54 54.4 U I41
2018-02-07 11:55:07 C 13 32 29.41 +36 55 08.4 U I41
2018-02-07 12:33:53 C 13 32 29.86 +36 55 24.3 U I41
2018-02-09 09:44:10 C 13 33 06.04 +37 14 41.0 U I41
2018-02-09 10:17:32 C 13 33 06.19 +37 14 56.9 U G96
2018-02-09 10:24:58 C 13 33 06.24 +37 15 00.3 U G96
2018-02-09 10:32:24 C 13 33 06.29 +37 15 03.6 U G96
2018-02-09 10:39:50 C 13 33 06.34 +37 15 06.9 U G96
2018-02-09 10:49:48 C 13 33 06.51 +37 15 11.1 U I41
2018-02-09 10:51:14 C 13 33 06.51 +37 15 11.8 U I41
2018-02-09 11:07:45 C 13 33 06.62 +37 15 19.2 U I41
2018-02-09 11:19:21 C 13 33 06.70 +37 15 24.5 U I41
2018-02-09 11:35:17 C 13 33 06.80 +37 15 31.6 U I41
2018-02-09 11:38:49 C 13 33 06.82 +37 15 33.3 U I41
2018-02-09 12:23:26 C 13 33 07.10 +37 15 53.2 U I41
2018-02-09 12:25:33 C 13 33 07.12 +37 15 54.1 U I41
2018-02-09 12:49:31 C 13 33 07.27 +37 16 04.7 U I41
2018-02-15 22:04:14 C 13 33 13.92 +38 34 42.0 U K83
2018-02-15 22:10:03 C 13 33 13.80 +38 34 45.8 U K83
2018-02-15 22:13:22 C 13 33 13.78 +38 34 48.2 U K83
2018-02-16 11:18:12 C 13 33 03.54 +38 42 43.1 U I41
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)