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
2025-08-15 03:03:20 C 04 02 13.061 +25 56 51.72 V R17
2025-08-15 03:23:43 C 04 02 12.223 +25 57 34.78 V R17
2025-08-15 03:44:05 C 04 02 11.388 +25 58 17.26 V R17
2025-08-15 04:04:29 C 04 02 10.536 +25 59 00.02 V R17
2025-08-18 00:00:21 B 03 59 18.24 +28 19 55.6 X L76
2025-08-18 00:05:30 B 03 59 18.02 +28 20 06.3 X L76
2025-08-18 00:10:39 B 03 59 17.76 +28 20 17.2 X L76
2025-08-18 00:15:49 B 03 59 17.52 +28 20 27.8 X L76
2025-08-18 00:20:58 B 03 59 17.29 +28 20 38.9 X L76
2025-08-18 00:26:06 B 03 59 17.04 +28 20 49.3 X L76
2025-08-22 14:48:46 C 03 53 42.768 +32 08 43.73 V T08
2025-08-22 15:00:47 C 03 53 42.050 +32 09 08.42 V T08
2025-08-22 15:12:49 C 03 53 41.323 +32 09 33.44 V T08
2025-08-23 08:46:09 B 03 52 41.227 +32 45 26.10 V U62
2025-08-23 09:14:09 B 03 52 39.559 +32 46 24.38 V U62
2025-08-23 09:28:01 B 03 52 38.736 +32 46 52.32 V U62
2025-08-24 08:38:47 B 03 51 15.012 +33 34 16.39 V U62
2025-08-24 09:11:36 B 03 51 12.967 +33 35 24.32 V U62
2025-08-24 09:25:24 B 03 51 12.094 +33 35 52.87 V U62
2025-08-29 03:28:52 C 03 43 12.466 +37 26 23.06 Z R60
2025-08-29 03:31:52 C 03 43 12.254 +37 26 29.00 Z R60
2025-08-29 03:34:52 C 03 43 12.024 +37 26 34.80 Z R60
2025-08-29 03:37:54 C 03 43 11.755 +37 26 40.52 Z R60
2025-08-29 03:40:53 C 03 43 11.484 +37 26 47.00 Z R60
2025-08-29 13:07:56 C 03 42 26.501 +37 45 39.85 V T08
2025-08-29 13:12:59 C 03 42 26.069 +37 45 50.15 V T08
2025-08-29 13:42:52 C 03 42 23.558 +37 46 49.94 V T08
2025-08-29 14:19:31 C 03 42 20.446 +37 48 03.38 V T08
2025-08-30 03:33:10 C 03 41 15.552 +38 14 13.99 Z R60
2025-08-30 03:36:12 C 03 41 15.348 +38 14 20.04 Z R60
2025-08-30 03:39:11 C 03 41 15.065 +38 14 26.12 Z R60
2025-08-30 13:20:16 C 03 40 26.460 +38 33 39.49 V T05
2025-08-30 13:25:08 C 03 40 26.021 +38 33 49.21 V T05
2025-08-30 13:25:38 C 03 40 25.958 +38 33 50.51 V T08
2025-08-30 13:32:23 C 03 40 25.385 +38 34 03.61 V T05
2025-08-30 13:32:37 C 03 40 25.346 +38 34 04.62 V T08
2025-08-30 13:40:35 C 03 40 24.641 +38 34 20.24 V T08
2025-08-30 13:48:10 C 03 40 23.976 +38 34 35.18 V T05
2025-08-30 13:55:20 C 03 40 23.333 +38 34 49.55 V T08
2025-08-31 01:50:03 C 03 39 22.390 +38 58 13.44 V R17
2025-08-31 02:11:23 C 03 39 20.489 +38 58 55.92 V R17
2025-08-31 02:32:35 C 03 39 18.600 +38 59 38.15 V R17
2025-08-31 02:53:29 C 03 39 16.726 +39 00 19.76 V R17
2025-08-31 12:59:41 C 03 38 23.182 +39 20 12.55 V T08
2025-08-31 13:04:46 C 03 38 22.754 +39 20 22.60 V T08
2025-08-31 13:15:13 C 03 38 21.761 +39 20 43.40 V T08
2025-08-31 13:34:26 C 03 38 19.978 +39 21 21.10 V T08
2025-08-31 22:11:30 C 03 37 33.67 +39 38 05.5 X C40
2025-08-31 22:13:54 C 03 37 33.45 +39 38 10.2 X C40
2025-08-31 22:16:19 C 03 37 33.23 +39 38 14.8 X C40
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)