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
2018-03-19 23:28:08 C 07 55 49.02 +42 45 09.1 q I15
2018-03-19 23:29:53 C 07 55 45.98 +42 44 48.3 q I15
2018-03-20 00:17:59 C 07 54 22.79 +42 35 23.4 S 932
2018-03-20 00:21:51 C 07 54 16.07 +42 34 37.6 S 932
2018-03-20 00:33:40 C 07 53 55.56 +42 32 17.3 S 932
2018-03-21 03:44:44 C 07 09 32.52 +36 19 48.2 U 703
2018-03-21 03:52:23 C 07 09 20.58 +36 17 50.7 U 703
2018-03-21 04:00:01 C 07 09 08.56 +36 15 52.2 U 703
2018-03-21 04:07:39 C 07 08 56.57 +36 13 54.8 U 703
2018-03-21 23:27:45 C 06 40 39.63 +30 59 57.1 13.3 r 238
2018-03-21 23:29:46 C 06 40 36.84 +30 59 22.8 13.2 r 238
2018-03-22 02:41:19 C 06 36 17.59 +30 06 27.0 U 703
2018-03-22 02:50:06 C 06 36 05.48 +30 03 57.6 U 703
2018-03-22 03:07:38 C 06 35 41.27 +29 58 57.5 U 703
2018-03-23 19:02:29 C 05 48 29.57 +18 33 03.4 q 160
2018-03-23 19:04:23 C 05 48 27.59 +18 32 31.6 q 160
2018-03-23 19:06:15 C 05 48 25.64 +18 32 00.1 q 160
2018-03-24 19:36:19 C 05 25 33.24 +12 00 13.2 Q 160
2018-03-24 19:38:46 C 05 25 31.11 +11 59 35.8 Q 160
2018-03-24 19:41:15 C 05 25 28.99 +11 58 58.3 Q 160
2018-03-24 19:45:28 C 05 25 25.97 +11 57 46.1 q C23
2018-03-24 19:47:11 C 05 25 24.51 +11 57 20.4 q C23
2018-03-24 19:48:54 C 05 25 23.03 +11 56 54.3 q C23
2018-03-24 19:50:51 C 05 25 21.34 +11 56 24.5 q C23
2018-03-25 19:47:42 C 05 06 42.74 +06 17 04.5 q 160
2018-03-25 19:50:23 C 05 06 40.81 +06 16 29.1 q 160
2018-03-25 19:53:04 C 05 06 38.86 +06 15 53.7 q 160
2018-03-25 22:35:37 C 05 04 44.18 +05 41 54.2 r Y00
2018-03-25 22:37:31 C 05 04 42.86 +05 41 28.6 r Y00
2018-03-25 22:40:16 C 05 04 40.92 +05 40 53.9 r Y00
2018-03-26 18:48:30 C 04 51 37.06 +01 35 00.3 q 160
2018-03-26 19:08:29 C 04 51 24.78 +01 31 14.5 q 160
2018-03-26 19:25:33 C 04 51 14.28 +01 28 00.5 q 160
2018-03-27 15:30:18 C 04 39 56.15 -02 03 05.3 q C97
2018-03-27 15:32:19 C 04 39 55.12 -02 03 23.1 q C97
2018-03-27 15:34:05 C 04 39 54.07 -02 03 41.6 q C97
2018-03-27 15:35:59 C 04 39 53.13 -02 03 58.2 q C97
2018-03-27 15:37:52 C 04 39 52.19 -02 04 17.1 q C97
2018-03-27 15:39:37 C 04 39 51.21 -02 04 34.8 q C97
2018-03-29 05:37:03 C 04 22 09.23 -07 29 44.8 U T05
2018-03-29 05:48:36 C 04 22 04.38 -07 31 11.0 U T05
2018-03-29 05:50:42 C 04 22 03.50 -07 31 26.3 U T05
2018-03-29 06:03:57 C 04 21 57.87 -07 33 05.1 U T05
2018-03-29 06:16:04 C 04 21 52.79 -07 34 34.5 U T05
2018-08-07 03:00:50 C 03 35 52.92 +35 56 40.2 q 160
2018-08-07 03:04:38 C 03 35 53.03 +35 56 45.4 q 160
2018-08-07 03:08:25 C 03 35 53.16 +35 56 50.5 q 160
2018-08-29 23:55:10 C 03 41 46.38 +47 24 41.1 q C95
2018-08-30 00:05:19 C 03 41 46.07 +47 24 53.7 q C95
2018-08-30 00:15:29 C 03 41 45.98 +47 25 05.8 q C95
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)