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
2025-08-31 22:18:44 C 03 37 33.01 +39 38 19.7 X C40
2025-08-31 22:21:08 C 03 37 32.78 +39 38 24.5 X C40
2025-08-31 22:23:33 C 03 37 32.56 +39 38 29.3 X C40
2025-08-31 22:25:58 C 03 37 32.33 +39 38 34.1 X C40
2025-08-31 22:28:23 C 03 37 32.11 +39 38 38.8 X C40
2025-08-31 22:30:42 C 03 37 31.89 +39 38 43.4 X C40
2025-08-31 22:32:53 C 03 37 31.69 +39 38 47.7 X C40
2025-08-31 22:35:05 C 03 37 31.50 +39 38 52.1 X C40
2025-08-31 22:37:18 C 03 37 31.28 +39 38 56.4 X C40
2025-09-01 10:05:55 C 03 36 28.363 +40 01 20.39 V T05
2025-09-01 10:44:26 C 03 36 24.725 +40 02 36.20 V T05
2025-09-01 10:49:09 C 03 36 24.300 +40 02 45.64 V T05
2025-09-01 11:20:54 C 03 36 21.266 +40 03 48.24 V T05
2025-09-01 21:56:27 C 03 35 21.14 +40 24 16.7 X D04
2025-09-01 22:06:00 C 03 35 20.27 +40 24 35.7 X D04
2025-09-01 22:14:44 C 03 35 19.37 +40 24 52.1 X D04
2025-09-02 12:53:44 C 03 33 54.238 +40 53 14.78 V T05
2025-09-02 13:05:15 C 03 33 53.062 +40 53 37.28 V T05
2025-09-02 13:15:19 C 03 33 52.034 +40 53 56.62 V T05
2025-09-02 13:35:32 C 03 33 49.961 +40 54 35.86 V T05
2025-09-02 23:16:56 B 03 32 52.687 +41 13 02.75 W J37
2025-09-03 00:00:08 B 03 32 48.281 +41 14 26.66 W J37
2025-09-03 00:20:45 B 03 32 46.212 +41 15 06.98 W J37
2025-09-03 13:03:58 C 03 31 28.154 +41 39 29.63 V T08
2025-09-03 13:12:37 C 03 31 27.221 +41 39 46.33 V T08
2025-09-03 13:16:35 C 03 31 26.786 +41 39 53.82 V T08
2025-09-04 01:09:41 C 03 30 12.766 +42 02 20.72 V R17
2025-09-04 01:31:06 C 03 30 10.466 +42 03 01.73 V R17
2025-09-04 01:53:01 C 03 30 08.102 +42 03 43.96 V R17
2025-09-04 02:14:43 C 03 30 05.753 +42 04 25.46 V R17
2025-09-05 12:54:50 C 03 26 17.486 +43 09 23.98 V T08
2025-09-05 12:58:50 C 03 26 17.006 +43 09 31.57 V T08
2025-09-05 13:08:54 C 03 26 15.826 +43 09 50.40 V T08
2025-09-05 13:26:16 C 03 26 13.793 +43 10 22.69 V T08
2025-09-05 23:43:07 B 03 25 03.07 +43 29 16.6 X L76
2025-09-05 23:48:16 B 03 25 02.48 +43 29 26.2 X L76
2025-09-05 23:53:23 B 03 25 01.86 +43 29 35.7 X L76
2025-09-05 23:58:32 B 03 25 01.26 +43 29 45.2 X L76
2025-09-06 00:03:40 B 03 25 00.65 +43 29 54.8 X L76
2025-09-06 00:08:48 B 03 25 00.04 +43 30 04.1 X L76
2025-09-06 02:43:04 B 03 24 41.998 +43 34 47.17 V L65
2025-09-06 02:47:15 B 03 24 41.496 +43 34 54.84 V L65
2025-09-06 02:51:25 B 03 24 40.997 +43 35 02.51 V L65
2025-09-06 12:34:04 C 03 23 32.885 +43 52 56.57 V T08
2025-09-06 12:56:44 C 03 23 30.120 +43 53 38.29 V T08
2025-09-06 13:05:05 C 03 23 29.076 +43 53 53.66 V T08
2025-09-06 13:09:10 C 03 23 28.584 +43 54 01.26 V T08
2025-09-06 22:32:23 B 03 22 21.20 +44 10 59.8 X L76
2025-09-06 22:38:32 B 03 22 20.44 +44 11 11.1 X L76
2025-09-06 22:44:41 B 03 22 19.69 +44 11 22.4 X L76
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)