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
2025-04-23 03:29:30 C 07 17 59.053 +27 53 59.35 V 703
2025-04-23 03:32:51 C 07 17 58.913 +27 53 51.18 V 703
2025-04-23 03:36:12 C 07 17 58.902 +27 53 44.59 V 703
2025-04-23 03:39:33 C 07 17 58.880 +27 53 36.06 V 703
2025-04-24 03:27:14 C 07 17 34.321 +27 01 42.78 V 703
2025-04-24 03:30:33 C 07 17 34.256 +27 01 35.58 V 703
2025-04-24 03:33:51 C 07 17 34.206 +27 01 28.09 V 703
2025-04-24 03:37:11 C 07 17 34.177 +27 01 20.64 V 703
2025-04-24 08:02:50 C 07 17 29.491 +26 51 41.87 V T05
2025-04-24 08:13:21 C 07 17 29.321 +26 51 18.65 V T05
2025-04-24 08:17:31 C 07 17 29.242 +26 51 09.54 V T05
2025-04-24 08:37:19 C 07 17 28.889 +26 50 25.87 V T05
2025-04-25 03:05:04 C 07 17 11.260 +26 10 06.64 V V00
2025-04-25 03:13:11 C 07 17 11.108 +26 09 48.82 V V00
2025-04-25 03:21:17 C 07 17 10.961 +26 09 31.00 V V00
2025-04-25 03:29:10 C 07 17 10.828 +26 09 13.36 V 703
2025-04-25 03:29:21 C 07 17 10.813 +26 09 13.25 V V00
2025-04-25 03:32:31 C 07 17 10.752 +26 09 06.26 V 703
2025-04-25 03:35:52 C 07 17 10.684 +26 08 58.74 V 703
2025-04-25 03:39:13 C 07 17 10.615 +26 08 51.72 V 703
2025-04-25 20:35:32 C 07 16 54.763 +25 31 45.23 Z C23
2025-04-25 21:07:24 C 07 16 54.247 +25 30 35.28 Z C23
2025-04-25 21:55:09 C 07 16 53.479 +25 28 50.41 Z C23
2025-04-26 03:43:03 C 07 16 48.090 +25 16 13.40 V 703
2025-04-26 03:46:25 C 07 16 48.032 +25 16 06.82 V 703
2025-04-26 03:49:46 C 07 16 47.968 +25 15 59.36 V 703
2025-04-26 03:53:07 C 07 16 47.932 +25 15 51.80 V 703
2025-04-26 21:16:05 C 07 16 32.316 +24 37 45.16 Z C23
2025-04-26 21:55:31 C 07 16 31.752 +24 36 16.27 Z C23
2025-04-27 03:34:13 C 07 16 26.627 +24 24 00.65 V 703
2025-04-27 03:37:35 C 07 16 26.630 +24 23 53.27 V 703
2025-04-27 03:40:56 C 07 16 26.569 +24 23 46.61 V 703
2025-04-27 03:44:17 C 07 16 26.519 +24 23 39.01 V 703
2025-04-27 05:56:37 C 07 16 24.612 +24 18 51.55 V T08
2025-04-27 06:01:17 C 07 16 24.542 +24 18 41.44 V T08
2025-04-27 06:11:14 C 07 16 24.360 +24 18 19.69 V T08
2025-04-27 06:25:53 C 07 16 24.110 +24 17 47.36 V T08
2025-04-28 03:44:53 C 07 16 05.567 +23 31 00.77 V 703
2025-04-28 03:48:11 C 07 16 05.473 +23 30 53.60 V 703
2025-04-28 03:51:30 C 07 16 05.423 +23 30 46.22 V 703
2025-04-28 03:54:49 C 07 16 05.376 +23 30 38.95 V 703
2025-04-28 20:06:12 B 07 15 51.612 +22 55 04.15 X K87
2025-04-28 20:08:19 B 07 15 51.576 +22 54 59.51 X K87
2025-04-29 03:36:25 C 07 15 45.097 +22 38 38.87 V 703
2025-04-29 03:39:46 C 07 15 45.083 +22 38 31.49 V 703
2025-04-29 03:43:07 C 07 15 45.032 +22 38 24.14 V 703
2025-04-29 18:15:02 B 07 15 32.82 +22 06 25.6 X L76
2025-04-29 18:25:17 B 07 15 32.68 +22 06 03.2 X L76
2025-04-29 18:35:32 B 07 15 32.53 +22 05 40.4 X L76
2025-04-29 20:46:59 C 07 15 30.706 +22 00 50.33 Z C23
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)