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
2018-03-08 10:56:33 C 12 39 38.65 +47 00 05.8 U T05
2018-03-08 15:41:51 C 12 37 55.01 +47 08 06.4 U T05
2018-03-09 19:07:10 C 12 27 17.96 +47 56 46.9 q C97
2018-03-09 19:08:55 C 12 27 17.14 +47 56 50.4 q C97
2018-03-09 19:10:39 C 12 27 16.48 +47 56 53.3 q C97
2018-03-09 19:12:40 C 12 27 15.48 +47 56 57.4 q C97
2018-03-09 19:14:41 C 12 27 14.57 +47 57 01.2 q C97
2018-03-09 19:16:26 C 12 27 13.80 +47 57 04.7 q C97
2018-03-09 20:13:56 C 12 26 50.03 +47 58 22.8 q 006
2018-03-09 20:15:17 C 12 26 49.46 +47 58 25.3 q 006
2018-03-09 20:16:56 C 12 26 48.73 +47 58 28.6 q 006
2018-03-09 20:17:57 C 12 26 48.31 +47 58 30.7 q 006
2018-03-09 20:19:16 C 12 26 47.73 +47 58 32.8 q 006
2018-03-09 20:20:36 C 12 26 47.15 +47 58 35.7 q 006
2018-03-09 20:21:57 C 12 26 46.56 +47 58 38.2 q 006
2018-03-09 20:23:16 C 12 26 45.96 +47 58 40.7 q 006
2018-03-10 11:10:40 C 12 19 55.79 +48 25 57.0 U 703
2018-03-10 11:26:04 C 12 19 48.20 +48 26 24.0 U 703
2018-03-10 11:33:45 C 12 19 44.40 +48 26 37.5 U 703
2018-03-10 13:21:30 C 12 18 52.89 +48 30 08.7 U T05
2018-03-10 13:24:08 C 12 18 51.57 +48 30 13.4 U T05
2018-03-10 13:45:40 C 12 18 40.66 +48 30 51.7 U T05
2018-03-10 13:48:19 C 12 18 39.35 +48 30 56.2 U T05
2018-03-10 14:09:10 C 12 18 28.83 +48 31 32.7 U T05
2018-03-10 14:11:09 C 12 18 27.80 +48 31 36.4 U T05
2018-03-10 14:33:12 C 12 18 16.65 +48 32 14.8 U T05
2018-03-10 14:33:50 C 12 18 16.32 +48 32 15.9 U T05
2018-03-11 11:17:04 C 12 07 17.82 +49 10 36.9 U T05
2018-03-11 11:36:33 C 12 07 06.24 +49 11 12.4 U T05
2018-03-11 11:47:12 C 12 06 59.89 +49 11 31.8 U T05
2018-03-13 21:03:42 C 11 25 37.55 +50 46 40.4 U Z80
2018-03-13 21:05:47 C 11 25 35.64 +50 46 43.0 U Z80
2018-03-13 21:07:53 C 11 25 33.73 +50 46 46.2 U Z80
2018-03-13 21:09:59 C 11 25 31.83 +50 46 49.2 U Z80
2018-03-13 21:12:04 C 11 25 29.94 +50 46 52.3 U Z80
2018-03-13 21:14:10 C 11 25 28.02 +50 46 55.0 U Z80
2018-03-13 21:16:16 C 11 25 26.15 +50 46 58.1 U Z80
2018-03-13 21:18:21 C 11 25 24.24 +50 47 00.8 U Z80
2018-03-13 21:20:27 C 11 25 22.43 +50 47 04.2 U Z80
2018-03-13 21:22:32 C 11 25 20.40 +50 47 08.1 U Z80
2018-03-14 19:34:05 C 11 03 36.74 +51 11 03.2 U K74
2018-03-14 19:54:23 C 11 03 14.80 +51 11 20.8 U K74
2018-03-14 19:59:05 C 11 03 09.74 +51 11 24.8 U K74
2018-03-14 20:06:33 C 11 03 01.63 +51 11 31.3 U K74
2018-03-15 15:47:58 C 10 40 23.77 +51 19 03.3 q C97
2018-03-15 15:49:48 C 10 40 21.49 +51 19 03.6 q C97
2018-03-15 15:51:36 C 10 40 19.32 +51 19 04.0 q C97
2018-03-15 15:53:27 C 10 40 16.60 +51 19 03.3 q C97
2018-03-16 18:28:07 C 10 04 17.22 +50 55 24.6 q C97
2018-03-16 18:30:34 C 10 04 13.41 +50 55 20.1 q C97
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)