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
2006-11-21 02:13:56 C 22 47 12.84 +35 43 29.4 r 703
2006-11-21 02:21:48 C 22 47 13.05 +35 43 26.4 r 703
2006-11-21 02:29:37 C 22 47 13.23 +35 43 23.8 r 703
2006-12-10 19:26:55 C 23 03 53.75 +33 57 00.4 c B15
2006-12-10 19:28:30 C 23 03 53.82 +33 57 00.3 c B15
2006-12-10 19:43:17 C 23 03 54.40 +33 56 58.8 c B15
2008-01-23 05:02:41 C 06 02 27.95 +77 18 44.1 o H55
2008-01-23 05:17:32 C 06 02 25.09 +77 18 36.9 o H55
2008-01-23 05:33:27 C 06 02 22.29 +77 18 30.6 o H55
2011-01-10 11:34:29 C 14 02 19.91 +10 09 27.2 c 704
2011-01-10 11:53:47 C 14 02 21.96 +10 09 05.6 c 704
2011-01-10 12:13:02 C 14 02 23.88 +10 08 41.0 c 704
2011-01-10 12:32:47 C 14 02 26.06 +10 08 17.7 c 704
2011-01-11 11:28:58 C 14 04 54.71 +09 40 11.0 c 704
2011-01-11 11:49:19 C 14 04 56.95 +09 39 46.4 c 704
2011-01-11 12:10:00 C 14 04 59.18 +09 39 20.9 c 704
2011-01-11 12:31:00 C 14 05 01.42 +09 38 54.9 c 704
2011-01-11 12:54:01 C 14 05 03.88 +09 38 25.8 c 704
2011-01-16 05:42:46 C 14 17 52.30 +07 07 49.6 w B19
2011-01-16 05:51:43 C 14 17 53.30 +07 07 37.1 w B19
2011-01-16 06:00:39 C 14 17 54.39 +07 07 23.9 w B19
2011-01-22 04:24:25 C 14 35 55.36 +03 22 14.1 w B19
2011-01-22 04:28:03 C 14 35 55.80 +03 22 07.6 w B19
2011-01-22 04:31:41 C 14 35 56.34 +03 22 01.2 w B19
2011-02-02 19:58:28 C 15 21 04.63 -06 43 17.1 o 300
2011-02-02 19:59:57 C 15 21 04.93 -06 43 21.1 o 300
2011-02-02 20:01:26 C 15 21 05.24 -06 43 25.0 o 300
2011-02-02 20:04:23 C 15 21 05.84 -06 43 32.8 o 300
2011-08-02 02:45:02 C 03 38 45.04 +41 09 16.5 c A24
2011-08-02 02:47:06 C 03 38 45.21 +41 09 17.0 c A24
2011-09-21 03:49:45 C 03 55 34.92 +60 21 13.4 c A24
2011-09-21 03:51:50 C 03 55 34.88 +60 21 14.4 c A24
2011-09-25 15:10:24 C 03 49 34.579 +61 55 38.54 L F51
2011-09-25 15:17:34 C 03 49 34.034 +61 55 44.78 L F51
2011-10-03 01:53:04 C 03 34 48.93 +64 19 11.9 c A24
2011-10-03 01:55:10 C 03 34 48.58 +64 19 13.0 c A24
2013-02-09 22:53:18 C 08 59 23.33 +72 09 29.8 c A24
2013-02-09 22:55:23 C 08 59 22.94 +72 09 28.8 c A24
2013-02-09 23:14:15 C 08 59 18.55 +72 09 26.3 c A24
2013-02-09 23:35:45 C 08 59 13.45 +72 09 23.2 c A24
2013-02-09 23:54:38 C 08 59 09.15 +72 09 19.7 c A24
2013-02-09 23:56:43 C 08 59 08.75 +72 09 19.4 c A24
2013-02-18 03:34:36 C 08 17 40.63 +71 04 40.4 r 703
2013-02-18 03:42:33 C 08 17 38.94 +71 04 36.9 r 703
2013-02-18 03:50:31 C 08 17 37.46 +71 04 32.5 r 703
2013-02-18 03:58:31 C 08 17 35.88 +71 04 28.5 r 703
2013-03-01 00:29:13 C 07 36 56.93 +68 07 41.8 q C73
2013-03-01 00:30:23 C 07 36 56.79 +68 07 40.9 q C73
2013-03-01 00:31:32 C 07 36 56.65 +68 07 39.8 q C73
2013-03-01 00:32:41 C 07 36 56.56 +68 07 39.1 q C73
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)