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
2025-04-29 21:36:37 C 07 15 29.928 +21 59 00.42 Z C23
2025-04-29 22:12:27 C 07 15 29.542 +21 57 44.42 Z C23
2025-04-30 03:46:43 C 07 15 24.721 +21 45 32.62 V 703
2025-04-30 03:50:03 C 07 15 24.664 +21 45 25.16 V 703
2025-04-30 03:53:25 C 07 15 24.559 +21 45 17.82 V 703
2025-04-30 03:56:45 C 07 15 24.570 +21 45 09.83 V 703
2025-04-30 18:34:32 C 07 15 12.25 +21 12 53.2 X D04
2025-04-30 18:39:02 C 07 15 12.19 +21 12 49.1 X D04
2025-04-30 18:43:32 C 07 15 12.15 +21 12 36.4 X D04
2025-04-30 18:48:02 C 07 15 12.07 +21 12 26.6 X D04
2025-04-30 18:52:31 C 07 15 11.95 +21 12 16.4 X D04
2025-04-30 18:59:16 B 07 15 11.92 +21 12 01.4 X L76
2025-04-30 19:09:31 B 07 15 11.75 +21 11 38.7 X L76
2025-04-30 19:19:46 B 07 15 11.59 +21 11 15.9 X L76
2025-05-04 17:53:13 C 07 13 48.50 +17 42 44.5 X D04
2025-05-04 17:57:43 C 07 13 48.51 +17 42 34.1 X D04
2025-05-04 18:02:13 C 07 13 48.33 +17 42 23.3 X D04
2025-05-04 20:21:32 C 07 13 46.265 +17 37 15.35 Z C23
2025-05-04 21:19:46 C 07 13 45.228 +17 35 05.82 Z C23
2025-05-08 20:31:31 C 07 12 05.352 +14 04 14.38 Z C23
2025-05-08 20:48:21 C 07 12 05.122 +14 03 36.65 Z C23
2025-05-09 03:55:29 C 07 11 56.328 +13 47 51.61 V 703
2025-05-09 03:58:45 C 07 11 56.260 +13 47 43.69 V 703
2025-05-09 04:02:01 C 07 11 56.209 +13 47 36.89 V 703
2025-05-09 04:05:16 C 07 11 56.116 +13 47 29.62 V 703
2025-05-09 05:43:10 C 07 11 54.290 +13 43 56.06 V T08
2025-05-09 05:47:48 C 07 11 54.154 +13 43 45.34 V T08
2025-05-09 05:48:27 C 07 11 54.156 +13 43 43.82 V T08
2025-05-09 05:57:04 C 07 11 53.916 +13 43 24.74 V T08
2025-05-09 05:59:04 C 07 11 53.940 +13 43 20.50 V T08
2025-05-09 06:11:45 C 07 11 53.621 +13 42 52.42 V T08
2025-05-09 06:13:49 C 07 11 53.590 +13 42 47.74 V T08
2025-05-13 06:18:37 C 07 09 38.064 +10 09 26.24 V T05
2025-05-13 06:23:13 C 07 09 37.930 +10 09 16.81 V T05
2025-05-13 06:31:03 C 07 09 37.694 +10 08 58.99 V T05
2025-05-13 06:47:27 C 07 09 37.183 +10 08 22.02 V T05
2025-05-13 16:47:56 C 07 09 20.911 +09 46 21.04 V M22
2025-05-13 16:52:29 C 07 09 20.789 +09 46 11.03 V M22
2025-05-13 17:01:35 C 07 09 20.513 +09 45 50.76 V M22
2025-05-13 17:15:56 C 07 09 20.038 +09 45 18.54 V M22
2025-07-23 09:50:43 C 04 20 31.186 +07 03 02.45 V W68
2025-07-23 09:55:20 C 04 20 30.986 +07 03 11.66 V W68
2025-07-23 10:24:27 C 04 20 29.755 +07 04 12.00 V W68
2025-07-23 10:32:18 C 04 20 29.414 +07 04 28.27 V W68
2025-07-26 14:26:57 C 04 17 38.402 +09 41 16.58 V T05
2025-07-26 14:34:49 C 04 17 38.114 +09 41 32.93 V T05
2025-07-26 14:44:46 C 04 17 37.750 +09 41 53.66 V T05
2025-07-26 15:00:31 C 04 17 37.147 +09 42 26.32 V T05
2025-07-29 14:25:41 C 04 15 12.581 +12 10 46.66 X F52
2025-07-29 14:32:16 C 04 15 12.355 +12 11 00.43 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)