1866 Sisyphus (1972 XA)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5381207270 ± 5.42e-09
Semi-major axis (a)1.8933719410 AU ± 4.50e-10
Inclination (i)41.20633494° ± 7.87e-07
Long. of Asc. Node (Ω)63.44668864° ± 1.04e-06
Arg. of Perihelion (ω)293.09862767° ± 1.07e-06
Mean Anomaly (M)140.66424737° ± 8.67e-07
Mean Motion (n)0.3783191899°/day ± 1.35e-10
Perihelion dist (q)0.87450926 AU ± 1.03e-08
Aphelion dist (Q)2.91223463 AU ± 1.03e-08
Orbital Period2.60527700 yr ± 9.28e-10
Physical Parameters
H (abs. magnitude)12.48
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.220″
Uncertainty0
Orbit TypeApollo
MOID0.102869 AU
Observations Used9210
Radar Obs Used1
Gaia Obs Used79
Oppositions38
Arc Total1955-2026
First Observation Used1955-01-26
Last Observation Used2026-04-06
Observations (11960)
Date Type RA Dec Mag Band Observatory
2020-03-16 18:32:11 C 05 57 06.01 +67 57 13.0 a 233
2020-03-16 18:38:14 C 05 57 06.58 +67 57 10.3 a 233
2020-03-16 20:51:22 n 05 57 19.94 +67 56 09.4 V Z43
2020-03-16 21:06:52 n 05 57 21.49 +67 56 02.4 V Z43
2020-03-16 21:21:31 n 05 57 22.95 +67 55 55.7 V Z43
2020-03-16 21:44:30 n 05 57 25.25 +67 55 45.1 V Z43
2020-03-16 21:57:40 n 05 57 26.55 +67 55 39.0 V Z43
2020-03-19 19:21:23 C 06 04 31.20 +67 24 19.8 q K73
2020-03-19 19:29:52 C 06 04 32.11 +67 24 16.1 q K73
2020-03-19 19:40:08 C 06 04 33.09 +67 24 12.2 q K73
2020-03-19 19:51:28 C 06 04 34.28 +67 24 06.0 q K73
2020-03-19 20:01:34 C 06 04 35.06 +67 24 00.9 q K73
2020-03-19 20:11:41 C 06 04 36.20 +67 23 57.4 q K73
2020-03-21 23:47:10 C 06 09 55.57 +67 00 42.7 q I15
2020-03-21 23:50:26 C 06 09 55.90 +67 00 41.1 q I15
2020-03-21 23:53:42 C 06 09 56.23 +67 00 39.6 q I15
2020-03-22 02:39:22 C 06 10 13.34 +66 59 25.6 V 703
2020-03-22 02:47:11 C 06 10 14.26 +66 59 23.4 V 703
2020-03-22 03:02:49 C 06 10 16.12 +66 59 15.8 V 703
2020-03-24 07:42:56 C 06 15 43.57 +66 35 30.7 V T05
2020-03-24 07:47:02 C 06 15 44.01 +66 35 29.0 V T05
2020-03-24 07:57:44 C 06 15 45.08 +66 35 23.9 V T05
2020-03-24 08:12:28 C 06 15 46.62 +66 35 17.2 V T05
2020-04-03 03:15:24 C 06 40 27.68 +64 49 05.0 V 703
2020-04-03 03:23:41 C 06 40 28.52 +64 49 01.2 V 703
2020-04-03 03:31:57 C 06 40 29.39 +64 48 57.3 V 703
2020-04-03 03:40:13 C 06 40 30.23 +64 48 53.5 V 703
2020-04-07 07:18:29 C 06 50 59.79 +64 03 30.1 V T08
2020-04-07 07:22:31 C 06 51 00.22 +64 03 28.3 V T08
2020-04-07 07:31:52 C 06 51 01.18 +64 03 23.9 V T08
2020-04-07 07:46:05 C 06 51 02.66 +64 03 17.2 V T08
2020-04-07 12:35:25 C 06 51 33.16 +64 01 04.9 q D29
2020-04-07 13:08:34 C 06 51 36.71 +64 00 49.3 q D29
2020-04-07 21:45:16 C 06 52 31.15 +63 56 51.0 V A16
2020-04-07 22:16:21 C 06 52 34.29 +63 56 36.8 V A16
2020-04-07 22:31:55 C 06 52 35.91 +63 56 29.9 V A16
2020-04-08 19:29:23 C 06 54 48.17 +63 46 55.1 q K73
2020-04-08 19:34:28 C 06 54 48.66 +63 46 52.7 q K73
2020-04-08 19:44:47 C 06 54 49.72 +63 46 48.4 q K73
2020-04-08 19:53:32 C 06 54 50.61 +63 46 43.8 q K73
2020-04-08 21:47:49 C 06 55 02.57 +63 45 50.4 V 204
2020-04-08 21:51:07 C 06 55 02.92 +63 45 48.9 V 204
2020-04-08 21:54:25 C 06 55 03.22 +63 45 47.2 V 204
2020-04-09 12:33:51 C 06 56 35.66 +63 39 05.5 q D29
2020-04-09 12:55:28 C 06 56 37.89 +63 38 55.5 q D29
2020-04-09 13:17:04 C 06 56 40.13 +63 38 45.2 q D29
2020-04-09 19:55:38 C 06 57 22.02 +63 35 41.2 t L04
2020-04-09 20:07:39 C 06 57 23.23 +63 35 35.6 t L04
2020-04-09 20:17:38 C 06 57 24.29 +63 35 30.9 t L04
2020-04-09 21:59:56 C 06 57 34.82 +63 34 41.7 q K73
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1985-12-08 00:00:00 -295248 20 Hz 2380 -1 -1
1985-12-08.000000 -29524800 2000 Hz 2380 251 251
Station codes
-1 Arecibo (305-m, 1963–2020)