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
2025-09-13 22:29:59 C 02 58 37.80 +48 55 13.0 X C40
2025-09-13 22:32:24 C 02 58 37.41 +48 55 16.9 X C40
2025-09-13 22:34:47 C 02 58 37.01 +48 55 20.5 X C40
2025-09-13 22:37:12 C 02 58 36.61 +48 55 24.3 X C40
2025-09-13 22:39:37 C 02 58 36.21 +48 55 28.0 X C40
2025-09-13 22:42:00 C 02 58 35.80 +48 55 31.9 X C40
2025-09-13 22:44:25 C 02 58 35.41 +48 55 35.6 X C40
2025-09-13 22:46:50 C 02 58 35.01 +48 55 39.5 X C40
2025-09-13 22:49:09 C 02 58 34.64 +48 55 43.1 X C40
2025-09-13 22:51:22 C 02 58 34.25 +48 55 46.5 X C40
2025-09-13 22:53:34 C 02 58 33.90 +48 55 49.9 X C40
2025-09-13 22:55:47 C 02 58 33.53 +48 55 53.2 X C40
2025-09-14 12:23:25 C 02 56 20.945 +49 16 36.34 V T05
2025-09-14 12:27:26 C 02 56 20.290 +49 16 42.53 V T05
2025-09-14 12:34:55 C 02 56 18.982 +49 16 54.08 V T05
2025-09-14 12:57:20 C 02 56 15.156 +49 17 28.43 V T05
2025-09-14 23:49:45 C 02 54 25.89 +49 33 46.2 X C40
2025-09-14 23:51:38 C 02 54 25.58 +49 33 49.0 X C40
2025-09-14 23:53:26 C 02 54 25.25 +49 33 51.8 X C40
2025-09-14 23:55:15 C 02 54 24.94 +49 33 54.5 X C40
2025-09-14 23:57:03 C 02 54 24.62 +49 33 57.2 X C40
2025-09-14 23:58:45 C 02 54 24.32 +49 33 59.9 X C40
2025-09-15 00:00:22 C 02 54 24.04 +49 34 02.1 X C40
2025-09-15 00:01:59 C 02 54 23.79 +49 34 04.4 X C40
2025-09-15 00:03:35 C 02 54 23.49 +49 34 06.9 X C40
2025-09-15 00:05:11 C 02 54 23.22 +49 34 09.5 X C40
2025-09-15 00:06:47 C 02 54 22.96 +49 34 11.8 X C40
2025-09-15 00:08:24 C 02 54 22.67 +49 34 14.2 X C40
2025-09-15 11:21:05 C 02 52 28.615 +49 50 55.14 V T08
2025-09-15 11:30:28 C 02 52 26.959 +49 51 09.14 V T08
2025-09-15 11:34:37 C 02 52 26.230 +49 51 15.16 V T08
2025-09-15 11:50:57 C 02 52 23.352 +49 51 39.49 V T08
2025-09-15 21:39:53 C 02 50 41.50 +50 05 52.4 X D04
2025-09-15 21:46:38 C 02 50 40.31 +50 06 02.8 X D04
2025-09-15 21:59:12 C 02 50 38.09 +50 06 20.4 X D04
2025-09-15 22:05:12 C 02 50 36.98 +50 06 29.0 X D04
2025-09-16 04:22:56 C 02 49 30.211 +50 15 38.52 V R17
2025-09-16 04:43:19 C 02 49 26.498 +50 16 07.50 V R17
2025-09-16 05:03:42 C 02 49 22.812 +50 16 36.48 V R17
2025-09-16 05:24:03 C 02 49 19.133 +50 17 05.42 V R17
2025-09-17 11:02:54 C 02 43 59.767 +50 58 29.28 V T08
2025-09-17 11:06:53 C 02 43 59.030 +50 58 34.75 V T08
2025-09-17 11:40:45 C 02 43 52.644 +50 59 21.37 V T08
2025-09-17 11:48:05 C 02 43 51.266 +50 59 31.49 V T08
2025-09-17 14:38:03 C 02 43 19.087 +51 03 21.91 X F51
2025-09-17 14:46:34 C 02 43 17.466 +51 03 33.37 X F51
2025-09-17 14:55:04 C 02 43 15.860 +51 03 44.68 X F51
2025-09-17 15:03:33 C 02 43 14.243 +51 03 56.04 X F51
2025-09-22 20:38:45 B 02 18 13.550 +53 32 52.08 V R61
2025-09-22 20:42:20 B 02 18 12.809 +53 32 56.11 V R61
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)