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
2025-10-26 21:22:14 C 23 42 04.24 +52 24 17.0 X C40
2025-10-30 22:22:47 C 23 33 09.696 +51 09 50.11 V R17
2025-10-30 22:43:08 C 23 33 07.975 +51 09 34.56 V R17
2025-10-30 23:03:31 C 23 33 06.298 +51 09 18.68 V R17
2025-10-30 23:23:53 C 23 33 04.570 +51 09 02.30 V R17
2025-11-01 04:57:53 C 23 30 47.534 +50 46 03.79 V G96
2025-11-01 05:06:12 C 23 30 46.910 +50 45 58.00 V G96
2025-11-01 05:14:30 C 23 30 46.260 +50 45 51.60 V G96
2025-11-01 08:44:56 C 23 30 30.655 +50 43 09.88 V T05
2025-11-01 08:52:18 C 23 30 30.041 +50 43 04.19 V T05
2025-11-01 08:57:36 C 23 30 29.669 +50 42 59.15 V T05
2025-11-01 09:12:42 C 23 30 28.507 +50 42 47.66 V T05
2025-11-02 07:46:04 C 23 28 52.825 +50 25 17.53 X F51
2025-11-02 07:59:15 C 23 28 51.876 +50 25 07.18 X F51
2025-11-02 08:12:27 C 23 28 50.930 +50 24 56.90 X F51
2025-11-02 20:52:22 C 23 27 59.68 +50 15 03.7 X C40
2025-11-02 20:59:33 C 23 27 59.18 +50 14 58.0 X C40
2025-11-02 21:06:36 C 23 27 58.66 +50 14 53.0 X C40
2025-11-02 22:16:16 C 23 27 54.442 +50 14 01.97 V R17
2025-11-02 22:36:40 C 23 27 53.030 +50 13 46.20 V R17
2025-11-02 22:57:01 C 23 27 51.684 +50 13 30.04 V R17
2025-11-02 23:17:24 C 23 27 50.273 +50 13 14.34 V R17
2025-11-03 04:06:01 C 23 27 31.770 +50 09 31.00 V G96
2025-11-03 04:14:19 C 23 27 31.230 +50 09 24.40 V G96
2025-11-03 04:22:38 C 23 27 30.611 +50 09 18.43 V G96
2025-11-03 04:30:58 C 23 27 30.031 +50 09 11.84 V G96
2025-11-06 23:09:12 B 23 22 25.992 +48 59 45.10 q Y84
2025-11-06 23:13:37 B 23 22 25.798 +48 59 41.24 q Y84
2025-11-06 23:17:58 B 23 22 25.603 +48 59 38.00 q Y84
2025-11-08 08:23:19 C 23 20 56.554 +48 34 52.86 V T08
2025-11-08 08:24:38 C 23 20 56.450 +48 34 51.74 V T08
2025-11-08 08:27:16 C 23 20 56.335 +48 34 49.66 V T08
2025-11-08 08:27:56 C 23 20 56.292 +48 34 49.12 V T08
2025-11-08 08:35:12 C 23 20 55.949 +48 34 43.82 V T08
2025-11-08 08:39:08 C 23 20 55.812 +48 34 41.09 V T08
2025-11-08 08:51:03 C 23 20 55.190 +48 34 31.33 V T08
2025-11-08 08:51:42 C 23 20 55.229 +48 34 30.61 V T08
2025-11-08 08:53:41 C 23 20 55.111 +48 34 29.53 V T08
2025-11-10 07:58:04 C 23 19 07.123 +47 59 47.98 V T08
2025-11-10 08:02:03 C 23 19 06.986 +47 59 45.13 V T08
2025-11-10 08:09:17 C 23 19 06.720 +47 59 39.48 V T08
2025-11-10 08:23:12 C 23 19 06.161 +47 59 29.47 V T08
2025-11-11 07:35:53 C 23 18 20.609 +47 42 41.26 V T08
2025-11-11 07:40:29 C 23 18 20.434 +47 42 37.98 V T08
2025-11-11 07:49:43 C 23 18 20.143 +47 42 31.32 V T08
2025-11-11 08:05:53 C 23 18 19.606 +47 42 19.08 V T08
2025-11-14 22:06:30 C 23 16 10.694 +46 42 00.86 V R17
2025-11-14 22:26:53 C 23 16 10.265 +46 41 46.64 V R17
2025-11-14 22:47:14 C 23 16 09.806 +46 41 32.78 V R17
2025-11-14 23:07:38 C 23 16 09.358 +46 41 18.82 V R17
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)