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
2025-03-27 21:53:27 C 07 49 23.042 +49 56 39.91 Z C23
2025-03-27 22:20:55 C 07 49 20.078 +49 55 46.56 Z C23
2025-03-29 06:28:32 C 07 46 05.762 +48 53 32.21 V T08
2025-03-29 06:36:33 C 07 46 04.946 +48 53 16.44 V T08
2025-03-29 06:43:01 C 07 46 04.289 +48 53 03.73 V T08
2025-03-29 06:48:34 C 07 46 03.725 +48 52 52.86 V T08
2025-03-30 03:20:52 C 07 44 07.616 +48 12 25.42 V G96
2025-03-30 03:29:18 C 07 44 06.806 +48 12 08.64 V G96
2025-03-30 03:37:40 C 07 44 06.004 +48 11 52.01 V G96
2025-03-30 03:46:00 C 07 44 05.204 +48 11 35.48 V G96
2025-03-30 04:46:31 C 07 43 59.423 +48 09 34.96 V 703
2025-03-30 04:49:35 C 07 43 59.128 +48 09 28.98 V 703
2025-03-30 04:52:40 C 07 43 58.814 +48 09 22.82 V 703
2025-03-30 04:55:45 C 07 43 58.516 +48 09 16.45 V 703
2025-03-30 06:14:53 C 07 43 51.684 +48 06 43.70 V T08
2025-03-30 06:20:23 C 07 43 51.166 +48 06 32.58 V T08
2025-03-30 06:26:29 C 07 43 50.580 +48 06 20.45 V T08
2025-03-31 06:17:53 C 07 41 44.182 +47 18 50.80 V T08
2025-03-31 06:23:13 C 07 41 43.687 +47 18 40.21 V T08
2025-03-31 06:28:43 C 07 41 43.205 +47 18 29.16 V T08
2025-03-31 06:33:29 C 07 41 42.773 +47 18 19.51 V T08
2025-03-31 20:06:33 C 07 40 34.483 +46 51 01.66 Z C23
2025-03-31 20:37:07 C 07 40 31.946 +46 49 59.74 Z C23
2025-03-31 21:06:40 C 07 40 29.436 +46 48 59.90 Z C23
2025-04-01 06:17:25 C 07 39 44.837 +46 30 37.04 V T05
2025-04-01 06:33:00 C 07 39 43.517 +46 30 04.97 V T05
2025-04-01 06:33:39 C 07 39 43.459 +46 30 03.49 V T05
2025-04-01 06:38:53 C 07 39 43.013 +46 29 53.20 V T05
2025-04-01 19:12:38 C 07 38 43.622 +46 04 21.40 X S24
2025-04-01 19:23:13 C 07 38 42.768 +46 03 59.69 X S24
2025-04-01 19:33:02 C 07 38 41.974 +46 03 39.67 X S24
2025-04-03 05:57:36 C 07 36 09.538 +44 53 32.28 V T08
2025-04-03 06:04:24 C 07 36 09.046 +44 53 18.38 V T08
2025-04-03 06:11:14 C 07 36 08.527 +44 53 04.27 V T08
2025-04-03 06:23:23 C 07 36 07.622 +44 52 39.18 V T08
2025-04-04 06:00:20 C 07 34 31.171 +44 04 01.20 V T05
2025-04-04 06:04:59 C 07 34 30.850 +44 03 51.52 V T05
2025-04-04 06:34:58 C 07 34 28.754 +44 02 49.27 V T05
2025-04-04 06:59:18 C 07 34 27.048 +44 01 58.87 V T08
2025-04-04 07:03:56 C 07 34 26.736 +44 01 49.01 V T08
2025-04-04 07:13:57 C 07 34 26.004 +44 01 28.13 V T08
2025-04-04 07:29:09 C 07 34 24.965 +44 00 56.63 V T08
2025-04-04 18:37:28 C 07 33 42.122 +43 37 48.61 X S24
2025-04-04 18:46:31 C 07 33 41.532 +43 37 29.68 X S24
2025-04-04 18:55:35 C 07 33 40.956 +43 37 10.63 X S24
2025-04-04 20:44:04 C 07 33 33.967 +43 33 24.73 Z C23
2025-04-04 21:15:02 C 07 33 31.896 +43 32 20.22 Z C23
2025-04-05 17:35:49 B 07 32 16.879 +42 50 06.86 Z M69
2025-04-05 17:43:53 B 07 32 16.368 +42 49 49.73 Z M69
2025-04-05 17:51:50 B 07 32 15.854 +42 49 32.99 Z M69
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)