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
2025-04-16 18:32:05 C 07 21 19.46 +33 25 55.9 X D04
2025-04-17 03:04:06 C 07 21 06.008 +33 07 34.03 V 703
2025-04-17 03:07:27 C 07 21 05.893 +33 07 26.87 V 703
2025-04-17 03:10:49 C 07 21 05.782 +33 07 19.24 V 703
2025-04-17 03:14:09 C 07 21 05.764 +33 07 11.50 V 703
2025-04-17 17:26:21 C 07 20 43.76 +32 36 26.5 X D04
2025-04-17 17:31:21 C 07 20 43.70 +32 36 15.2 X D04
2025-04-17 17:33:54 B 07 20 43.58 +32 36 09.6 X L76
2025-04-17 17:44:09 B 07 20 43.29 +32 35 47.2 X L76
2025-04-17 17:53:05 C 07 20 43.07 +32 35 28.3 X D04
2025-04-17 17:54:24 B 07 20 43.02 +32 35 25.2 X L76
2025-04-18 03:11:01 C 07 20 29.170 +32 15 23.80 V 703
2025-04-18 03:14:22 C 07 20 29.094 +32 15 16.60 V 703
2025-04-18 03:17:44 C 07 20 29.015 +32 15 09.25 V 703
2025-04-18 03:21:05 C 07 20 28.903 +32 15 01.62 V 703
2025-04-18 17:48:00 C 07 20 08.05 +31 43 41.0 X D04
2025-04-18 17:57:45 C 07 20 07.84 +31 43 21.0 X D04
2025-04-18 20:28:00 C 07 20 04.358 +31 37 53.26 Z C23
2025-04-18 21:09:05 C 07 20 03.346 +31 36 23.29 Z C23
2025-04-18 21:51:55 C 07 20 02.359 +31 34 50.27 Z C23
2025-04-19 19:16:12 C 07 19 33.39 +30 48 26.1 X C40
2025-04-19 19:19:09 C 07 19 33.30 +30 48 19.8 X C40
2025-04-19 19:22:04 C 07 19 33.26 +30 48 13.0 X C40
2025-04-19 19:25:01 C 07 19 33.19 +30 48 06.0 X C40
2025-04-19 19:27:57 C 07 19 33.11 +30 48 00.1 X C40
2025-04-19 19:30:52 C 07 19 33.08 +30 47 53.3 X C40
2025-04-19 19:33:48 C 07 19 32.92 +30 47 46.8 X C40
2025-04-19 19:42:36 C 07 19 32.78 +30 47 28.0 X C40
2025-04-19 19:45:33 C 07 19 32.67 +30 47 20.9 X C40
2025-04-19 19:48:29 C 07 19 32.62 +30 47 14.8 X C40
2025-04-20 03:24:05 C 07 19 22.850 +30 30 48.96 V 703
2025-04-20 03:27:24 C 07 19 22.825 +30 30 43.81 V 703
2025-04-20 03:34:01 C 07 19 22.717 +30 30 29.09 V 703
2025-04-21 03:25:35 C 07 18 53.190 +29 38 38.51 V 703
2025-04-21 03:28:55 C 07 18 53.104 +29 38 31.38 V 703
2025-04-21 03:32:16 C 07 18 53.042 +29 38 23.68 V 703
2025-04-21 03:35:37 C 07 18 52.927 +29 38 16.15 V 703
2025-04-21 20:12:20 C 07 18 33.54 +29 02 05.1 V M14
2025-04-21 20:29:50 C 07 18 33.17 +29 01 26.6 V M14
2025-04-21 20:57:15 B 07 18 32.736 +29 00 25.99 W Z80
2025-04-21 21:01:19 B 07 18 32.645 +29 00 17.03 W Z80
2025-04-21 21:05:23 B 07 18 32.563 +29 00 08.39 W Z80
2025-04-22 03:25:59 C 07 18 25.312 +28 46 24.10 V 703
2025-04-22 03:29:18 C 07 18 25.265 +28 46 16.46 V 703
2025-04-22 03:32:37 C 07 18 25.171 +28 46 09.98 V 703
2025-04-22 03:35:56 C 07 18 25.088 +28 46 02.60 V 703
2025-04-22 20:42:12 C 07 18 06.360 +28 08 48.12 V R17
2025-04-22 21:02:42 C 07 18 05.938 +28 08 03.08 V R17
2025-04-22 21:23:15 C 07 18 05.513 +28 07 18.05 V R17
2025-04-22 21:44:02 C 07 18 05.086 +28 06 32.36 V R17
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)