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
2018-09-05 14:05:15 C 03 38 13.93 +50 37 32.2 U T08
2018-09-05 14:18:34 C 03 38 13.53 +50 37 47.7 U T08
2018-09-05 14:31:19 C 03 38 13.06 +50 38 03.4 U T08
2018-09-05 14:44:07 C 03 38 12.57 +50 38 19.1 U T08
2018-09-05 14:45:28 C 03 38 12.56 +50 38 20.8 U T08
2018-09-05 15:00:21 C 03 38 12.06 +50 38 38.1 U T08
2018-09-05 15:13:29 C 03 38 11.52 +50 38 54.0 U T08
2018-09-07 14:29:22 C 03 36 29.21 +51 35 22.6 U T05
2018-09-07 14:42:09 C 03 36 28.66 +51 35 37.3 U T05
2018-09-07 14:55:01 C 03 36 28.06 +51 35 53.2 U T05
2018-09-07 15:08:00 C 03 36 27.55 +51 36 08.2 U T05
2018-09-09 14:12:40 C 03 34 25.53 +52 31 39.3 U T08
2018-09-09 14:38:23 C 03 34 24.12 +52 32 08.5 U T08
2018-09-09 14:43:09 C 03 34 23.97 +52 32 13.5 U T08
2018-09-09 14:53:39 C 03 34 23.43 +52 32 27.0 U T08
2018-09-09 15:08:33 C 03 34 22.67 +52 32 44.5 U T08
2018-09-21 12:33:08 C 03 13 46.17 +57 44 31.7 U T08
2018-09-21 12:37:02 C 03 13 45.68 +57 44 35.0 U T08
2018-09-21 12:51:40 C 03 13 44.23 +57 44 50.3 U T08
2018-09-21 13:05:22 C 03 13 42.76 +57 45 03.4 U T08
2018-10-09 11:53:30 C 02 12 16.58 +62 52 56.2 U T05
2018-10-09 12:07:03 C 02 12 14.18 +62 53 00.6 U T05
2018-10-09 12:07:42 C 02 12 14.03 +62 53 00.8 U T05
2018-10-09 12:08:21 C 02 12 13.90 +62 53 01.3 U T05
2018-10-09 12:37:47 C 02 12 08.56 +62 53 12.3 U T05
2018-10-15 23:58:29 C 01 43 40.16 +63 27 02.0 q W34
2018-10-16 00:19:21 C 01 43 36.40 +63 27 03.7 q W34
2018-10-16 00:33:11 C 01 43 33.47 +63 27 05.1 q W34
2018-11-20 07:29:18 C 23 59 13.531 +56 39 57.59 U F52
2018-11-20 07:46:05 C 23 59 12.713 +56 39 45.41 U F52
2018-11-20 08:19:40 C 23 59 11.130 +56 39 21.15 U F52
2019-01-25 02:05:36 C 00 35 09.41 +45 35 05.8 V G96
2019-01-25 02:14:09 C 00 35 09.92 +45 35 04.1 V G96
2019-01-25 02:22:41 C 00 35 10.41 +45 35 03.0 V G96
2020-01-24 10:10:53 C 08 52 31.29 +75 22 49.3 V T05
2020-01-24 10:15:47 C 08 52 30.19 +75 22 49.9 V T05
2020-01-24 10:25:06 C 08 52 28.05 +75 22 51.0 V T05
2020-01-24 10:40:48 C 08 52 24.33 +75 22 53.0 V T05
2020-01-26 12:53:13 C 08 40 40.16 +75 27 15.2 V T08
2020-01-26 12:57:55 C 08 40 39.22 +75 27 15.4 V T08
2020-01-26 13:05:18 C 08 40 37.42 +75 27 16.0 V T08
2020-01-26 13:29:29 C 08 40 31.68 +75 27 16.2 V T08
2020-01-30 09:36:27 C 08 18 48.00 +75 24 18.5 V T08
2020-01-30 09:41:40 C 08 18 46.67 +75 24 17.7 V T08
2020-01-30 09:50:01 C 08 18 44.65 +75 24 15.8 V T08
2020-01-30 10:46:43 C 08 18 30.72 +75 24 09.4 V T08
2020-01-30 10:54:45 C 08 18 29.11 +75 24 08.6 V T08
2020-01-30 11:12:14 C 08 18 25.11 +75 24 07.5 V T08
2020-02-01 05:14:53 C 08 08 38.73 +75 17 52.8 U I41
2020-02-01 05:16:55 C 08 08 38.26 +75 17 52.3 U I41
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)