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
2025-03-10 23:44:30 C 08 57 30.01 +60 35 25.9 X C40
2025-03-10 23:47:30 C 08 57 29.23 +60 35 22.3 X C40
2025-03-10 23:50:31 C 08 57 28.64 +60 35 19.7 X C40
2025-03-10 23:53:32 C 08 57 27.85 +60 35 15.5 X C40
2025-03-10 23:56:32 C 08 57 27.14 +60 35 12.2 X C40
2025-03-10 23:59:33 C 08 57 26.46 +60 35 09.0 X C40
2025-03-11 00:02:33 C 08 57 25.73 +60 35 05.5 X C40
2025-03-11 00:05:34 C 08 57 25.06 +60 35 02.3 X C40
2025-03-11 00:06:10 C 08 57 24.81 +60 35 01.2 X D04
2025-03-11 00:08:34 C 08 57 24.34 +60 34 59.0 X C40
2025-03-11 00:19:41 C 08 57 21.75 +60 34 46.1 X D04
2025-03-11 00:37:41 C 08 57 17.45 +60 34 26.2 X D04
2025-03-11 00:41:59 C 08 57 16.44 +60 34 21.5 X D04
2025-03-11 00:54:22 C 08 57 13.62 +60 34 08.7 X D04
2025-03-11 13:08:29 C 08 54 23.539 +60 20 39.08 V T08
2025-03-11 13:13:08 C 08 54 22.426 +60 20 33.68 V T08
2025-03-11 13:21:13 C 08 54 20.520 +60 20 24.50 V T08
2025-03-11 13:42:09 C 08 54 15.684 +60 20 00.02 V T08
2025-03-11 22:41:05 B 08 52 14.316 +60 09 52.27 q J51
2025-03-11 22:51:49 B 08 52 11.714 +60 09 39.92 q J51
2025-03-11 23:00:40 B 08 52 09.629 +60 09 29.95 q J51
2025-03-13 05:26:53 C 08 45 25.661 +59 32 59.35 V T05
2025-03-13 06:34:10 C 08 45 10.718 +59 31 36.98 V T05
2025-03-13 07:04:47 C 08 45 03.902 +59 30 59.04 V T05
2025-03-15 08:39:56 C 08 34 43.810 +58 25 44.98 V T08
2025-03-15 08:44:38 C 08 34 42.862 +58 25 38.35 V T08
2025-03-15 08:52:39 C 08 34 41.201 +58 25 27.19 V T08
2025-03-15 09:08:39 C 08 34 37.908 +58 25 04.80 V T08
2025-03-16 00:10:53 C 08 31 39.876 +58 03 52.60 Z C23
2025-03-16 00:21:55 C 08 31 37.603 +58 03 36.90 Z C23
2025-03-16 00:36:19 C 08 31 34.778 +58 03 15.95 Z C23
2025-03-16 04:42:57 C 08 30 47.736 +57 57 31.10 V 703
2025-03-16 04:46:07 C 08 30 47.045 +57 57 26.42 V 703
2025-03-16 04:49:17 C 08 30 46.422 +57 57 21.74 V 703
2025-03-16 04:52:27 C 08 30 45.731 +57 57 17.17 V 703
2025-03-16 07:52:45 C 08 30 10.442 +57 52 55.60 Z U76
2025-03-16 08:08:39 C 08 30 07.313 +57 52 32.30 Z U76
2025-03-16 08:23:35 C 08 30 04.397 +57 52 10.52 Z U76
2025-03-16 17:33:01 C 08 28 21.107 +57 38 56.47 W M01
2025-03-16 17:34:11 C 08 28 20.856 +57 38 54.63 W M01
2025-03-16 17:35:31 C 08 28 20.620 +57 38 52.89 W M01
2025-03-16 17:36:41 C 08 28 20.370 +57 38 50.96 W M01
2025-03-16 17:38:01 C 08 28 20.134 +57 38 49.31 W M01
2025-03-16 17:39:11 C 08 28 19.883 +57 38 47.29 W M01
2025-03-16 18:54:21 C 08 28 05.397 +57 36 57.41 W M01
2025-03-16 18:55:31 C 08 28 05.112 +57 36 55.89 W M01
2025-03-16 18:56:51 C 08 28 04.895 +57 36 53.73 W M01
2025-03-16 18:58:01 C 08 28 04.632 +57 36 52.24 W M01
2025-03-16 18:59:21 C 08 28 04.393 +57 36 50.06 W M01
2025-03-16 19:00:31 C 08 28 04.152 +57 36 48.60 W M01
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)