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
2025-09-06 22:50:50 B 03 22 18.92 +44 11 33.6 X L76
2025-09-06 22:57:00 B 03 22 18.17 +44 11 45.2 X L76
2025-09-07 00:30:04 B 03 22 06.883 +44 14 32.24 V L65
2025-09-07 00:34:15 B 03 22 06.374 +44 14 39.98 V L65
2025-09-07 00:38:25 B 03 22 05.861 +44 14 47.69 V L65
2025-09-07 12:56:12 C 03 20 35.186 +44 37 06.85 V T05
2025-09-07 13:00:14 C 03 20 34.692 +44 37 14.16 V T05
2025-09-07 13:09:49 C 03 20 33.432 +44 37 31.44 V T05
2025-09-07 13:23:48 C 03 20 31.644 +44 37 56.78 V T05
2025-09-07 21:33:00 B 03 19 30.72 +44 52 24.9 X L76
2025-09-07 21:43:16 B 03 19 29.33 +44 52 43.6 X L76
2025-09-07 21:53:32 B 03 19 28.03 +44 53 02.6 X L76
2025-09-08 00:55:04 B 03 19 04.846 +44 58 26.00 V L65
2025-09-08 00:59:15 B 03 19 04.301 +44 58 33.60 V L65
2025-09-08 01:03:26 B 03 19 03.737 +44 58 40.94 V L65
2025-09-08 12:08:21 C 03 17 38.580 +45 18 27.18 V T05
2025-09-08 12:13:05 C 03 17 37.930 +45 18 35.06 V T05
2025-09-08 12:26:27 C 03 17 36.139 +45 18 59.29 V T05
2025-09-08 12:52:54 C 03 17 32.626 +45 19 46.42 V T05
2025-09-09 11:21:48 C 03 14 34.032 +45 59 04.60 V T08
2025-09-09 11:25:55 C 03 14 33.475 +45 59 11.76 V T08
2025-09-09 12:01:33 C 03 14 28.524 +46 00 14.44 V T08
2025-09-09 12:13:00 C 03 14 26.890 +46 00 34.45 V T08
2025-09-10 09:06:31 C 03 11 33.713 +46 36 22.90 V G96
2025-09-10 09:16:06 C 03 11 32.334 +46 36 39.24 V G96
2025-09-10 09:25:43 C 03 11 30.948 +46 36 55.73 V G96
2025-09-10 09:35:19 C 03 11 29.555 +46 37 12.11 V G96
2025-09-11 04:25:48 B 03 08 48.14 +47 08 50.1 Z W37
2025-09-11 05:08:18 B 03 08 41.86 +47 10 02.1 Z W37
2025-09-11 05:51:06 B 03 08 35.54 +47 11 14.6 Z W37
2025-09-11 11:59:55 C 03 07 41.398 +47 21 32.40 V T08
2025-09-11 12:04:02 C 03 07 40.766 +47 21 39.24 V T08
2025-09-11 12:13:22 C 03 07 39.367 +47 21 54.94 V T08
2025-09-11 12:31:49 C 03 07 36.552 +47 22 25.82 V T08
2025-09-12 04:49:18 B 03 05 10.64 +47 49 02.0 Z W37
2025-09-12 05:38:34 B 03 05 03.06 +47 50 23.1 Z W37
2025-09-12 06:30:17 B 03 04 55.08 +47 51 47.8 Z W37
2025-09-12 12:03:23 C 03 04 04.186 +48 00 51.95 V T08
2025-09-12 12:04:03 C 03 04 04.078 +48 00 52.96 V T08
2025-09-12 12:07:22 C 03 04 03.540 +48 00 58.39 V T08
2025-09-12 12:08:53 C 03 04 03.326 +48 01 00.66 V T08
2025-09-12 12:16:10 C 03 04 02.172 +48 01 12.65 V T08
2025-09-12 12:16:51 C 03 04 02.074 +48 01 13.69 V T08
2025-09-12 12:36:38 C 03 03 58.925 +48 01 46.06 V T08
2025-09-12 12:37:58 C 03 03 58.726 +48 01 48.11 V T08
2025-09-13 21:03:23 C 02 58 52.15 +48 52 58.1 X D04
2025-09-13 21:22:09 C 02 58 48.95 +48 53 27.2 X D04
2025-09-13 21:28:30 C 02 58 47.98 +48 53 36.6 X C40
2025-09-13 21:29:37 C 02 58 47.78 +48 53 38.2 X C40
2025-09-13 21:31:19 C 02 58 47.50 +48 53 40.1 X C40
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)