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
2020-12-11 05:23:33 C 21 43 12.38 -00 34 59.2 V T05
2020-12-11 05:28:09 C 21 43 12.91 -00 34 53.3 V T05
2020-12-11 05:37:22 C 21 43 13.95 -00 34 40.5 V T05
2020-12-11 05:53:09 C 21 43 15.78 -00 34 18.6 V T05
2020-12-22 02:04:39 C 22 11 18.31 +04 47 28.3 V 703
2020-12-22 02:21:12 C 22 11 19.99 +04 47 47.6 V 703
2020-12-22 02:29:29 C 22 11 20.91 +04 47 56.1 V 703
2020-12-23 04:44:28 C 22 13 58.48 +05 17 09.5 V T05
2020-12-23 04:49:07 C 22 13 58.89 +05 17 14.7 V T05
2020-12-23 05:00:24 C 22 14 00.01 +05 17 27.2 V T05
2020-12-23 05:17:09 C 22 14 01.64 +05 17 45.7 V T05
2020-12-25 05:31:11 C 22 18 46.35 +06 10 04.2 V T08
2020-12-25 05:35:49 C 22 18 46.84 +06 10 09.5 V T08
2020-12-25 05:46:27 C 22 18 47.88 +06 10 20.4 V T08
2020-12-25 06:01:04 C 22 18 49.18 +06 10 36.0 V T08
2020-12-27 01:32:42 C 22 23 01.45 +06 56 22.9 V 703
2020-12-27 01:40:21 C 22 23 02.19 +06 56 29.9 V 703
2020-12-27 01:55:39 C 22 23 03.63 +06 56 45.8 V 703
2021-01-04 05:50:45 C 22 41 10.00 +10 08 30.4 V T05
2021-01-04 05:58:09 C 22 41 10.72 +10 08 38.1 V T05
2021-01-04 06:04:09 C 22 41 11.26 +10 08 43.0 V T05
2021-01-04 06:20:52 C 22 41 12.72 +10 08 58.5 V T05
2021-01-06 02:11:07 C 22 45 06.88 +10 49 03.3 V 703
2021-01-06 02:19:18 C 22 45 07.57 +10 49 11.1 V 703
2021-01-06 02:27:29 C 22 45 08.28 +10 49 17.4 V 703
2021-01-06 02:35:40 C 22 45 08.98 +10 49 23.9 V 703
2021-01-18 02:18:42 C 23 09 45.85 +14 52 37.5 V 703
2021-01-18 02:26:56 C 23 09 46.54 +14 52 44.4 V 703
2021-01-18 02:35:09 C 23 09 47.29 +14 52 50.1 V 703
2021-01-18 02:43:22 C 23 09 47.94 +14 52 55.4 V 703
2021-02-01 01:57:47 C 23 36 57.95 +19 03 49.4 V 703
2021-02-01 02:22:27 C 23 36 59.79 +19 04 07.4 V 703
2021-02-08 02:39:02 C 23 50 15.27 +21 00 31.9 U I41
2021-02-08 02:43:18 C 23 50 15.61 +21 00 34.5 U I41
2021-02-08 02:47:36 C 23 50 15.93 +21 00 37.7 U I41
2021-02-08 02:51:54 C 23 50 16.27 +21 00 40.8 U I41
2021-02-09 02:43:53 C 23 52 08.25 +21 16 46.7 U I41
2021-02-09 02:48:12 C 23 52 08.59 +21 16 49.6 U I41
2021-02-09 02:52:29 C 23 52 08.92 +21 16 52.6 U I41
2021-02-09 02:56:48 C 23 52 09.24 +21 16 55.1 U I41
2021-02-10 02:41:41 C 23 54 00.52 +21 32 50.9 U I41
2021-02-10 02:45:57 C 23 54 00.84 +21 32 53.7 U I41
2021-02-10 02:54:30 C 23 54 01.49 +21 32 59.5 U I41
2021-02-10 02:58:47 C 23 54 01.82 +21 33 02.2 U I41
2021-10-20 11:23:10 C 07 45 06.489 +68 01 18.51 U F51
2021-10-20 12:04:54 C 07 45 07.930 +68 01 42.54 U F51
2021-10-20 12:25:43 C 07 45 08.719 +68 01 54.52 U F51
2023-10-26 09:33:43 C 04 07 08.556 +72 18 08.70 X F52
2023-10-26 09:47:36 C 04 07 06.440 +72 18 14.99 X F52
2023-10-26 10:01:31 C 04 07 04.392 +72 18 21.40 X F52
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)