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
2025-03-16 19:02:11 C 08 28 03.822 +57 36 46.08 W M01
2025-03-16 19:04:41 C 08 28 03.339 +57 36 42.41 W M01
2025-03-16 19:07:11 C 08 28 02.856 +57 36 38.75 W M01
2025-03-16 19:07:31 C 08 28 02.770 +57 36 37.86 W M01
2025-03-16 19:07:41 C 08 28 02.745 +57 36 37.86 W M01
2025-03-16 19:08:51 C 08 28 02.499 +57 36 35.79 W M01
2025-03-16 19:10:01 C 08 28 02.282 +57 36 34.14 W M01
2025-03-16 19:10:11 C 08 28 02.269 +57 36 34.28 W M01
2025-03-16 19:11:21 C 08 28 02.017 +57 36 32.05 W M01
2025-03-16 19:12:31 C 08 28 01.794 +57 36 30.42 W M01
2025-03-16 19:12:41 C 08 28 01.794 +57 36 30.69 W M01
2025-03-16 19:13:51 C 08 28 01.535 +57 36 28.31 W M01
2025-03-16 19:14:21 C 08 28 01.481 +57 36 28.13 W M01
2025-03-16 19:14:51 C 08 28 01.350 +57 36 27.07 W M01
2025-03-16 19:15:31 C 08 28 01.281 +57 36 26.04 W M01
2025-03-16 19:16:51 C 08 28 00.992 +57 36 24.50 W M01
2025-03-16 19:17:21 C 08 28 00.868 +57 36 23.43 W M01
2025-03-16 19:18:01 C 08 28 00.803 +57 36 22.35 W M01
2025-03-16 19:19:21 C 08 28 00.503 +57 36 20.86 W M01
2025-03-16 19:19:51 C 08 28 00.385 +57 36 19.78 W M01
2025-03-16 19:20:31 C 08 28 00.324 +57 36 18.66 W M01
2025-03-16 19:21:01 C 08 28 00.176 +57 36 18.34 W M01
2025-03-16 19:22:11 C 08 27 59.996 +57 36 16.01 W M01
2025-03-16 19:23:31 C 08 27 59.692 +57 36 14.66 W M01
2025-03-16 19:24:41 C 08 27 59.517 +57 36 12.44 W M01
2025-03-16 19:26:01 C 08 27 59.209 +57 36 10.99 W M01
2025-03-16 19:27:11 C 08 27 59.039 +57 36 08.87 W M01
2025-03-17 04:47:31 C 08 26 14.554 +57 22 20.39 V 703
2025-03-17 04:50:41 C 08 26 13.931 +57 22 15.78 V 703
2025-03-17 04:53:51 C 08 26 13.355 +57 22 11.03 V 703
2025-03-17 04:57:01 C 08 26 12.703 +57 22 05.88 V 703
2025-03-17 08:30:47 C 08 25 33.154 +57 16 48.50 V T05
2025-03-17 08:35:22 C 08 25 32.297 +57 16 41.52 V T05
2025-03-17 08:48:43 C 08 25 29.774 +57 16 21.25 V T05
2025-03-17 09:06:06 C 08 25 26.506 +57 15 55.01 V T05
2025-03-17 19:29:05 B 08 23 34.066 +57 00 08.24 V L65
2025-03-17 19:33:16 B 08 23 33.300 +57 00 02.02 V L65
2025-03-17 19:37:27 B 08 23 32.546 +56 59 55.46 V L65
2025-03-17 19:52:52 B 08 23 29.698 +56 59 32.82 X K87
2025-03-17 19:53:55 B 08 23 29.496 +56 59 31.38 X K87
2025-03-17 19:54:59 B 08 23 29.292 +56 59 29.54 X K87
2025-03-18 19:10:07 C 08 19 24.17 +56 23 27.4 Z M62
2025-03-18 19:34:55 C 08 19 19.81 +56 22 48.4 Z M62
2025-03-18 19:58:41 C 08 19 15.63 +56 22 11.0 Z M62
2025-03-18 20:06:05 B 08 19 14.299 +56 21 58.32 V L65
2025-03-18 20:10:17 B 08 19 13.558 +56 21 51.52 V L65
2025-03-18 20:14:28 B 08 19 12.821 +56 21 44.86 V L65
2025-03-18 21:31:46 C 08 18 59.304 +56 19 42.53 Z C23
2025-03-18 21:52:28 C 08 18 55.714 +56 19 10.16 Z C23
2025-03-18 22:05:33 C 08 18 53.448 +56 18 49.14 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)