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
2020-02-23 06:45:07 C 05 08 09.58 +72 09 47.6 V T08
2020-02-23 06:59:09 C 05 08 10.55 +72 09 40.7 V T08
2020-02-27 09:25:48 C 05 15 50.72 +71 21 37.9 V T08
2020-02-27 09:30:02 C 05 15 51.06 +71 21 35.7 V T08
2020-02-27 09:38:00 C 05 15 51.72 +71 21 31.9 V T08
2020-02-27 09:52:16 C 05 15 52.85 +71 21 24.7 V T08
2020-03-02 05:37:48 C 05 23 42.28 +70 37 37.5 o Z22
2020-03-02 05:50:21 C 05 23 43.31 +70 37 32.1 o Z22
2020-03-02 07:06:04 C 05 23 50.07 +70 37 00.4 V T08
2020-03-02 07:10:42 C 05 23 50.46 +70 36 58.1 V T08
2020-03-02 07:18:15 C 05 23 51.06 +70 36 54.3 V T08
2020-03-02 07:27:52 C 05 23 51.90 +70 36 49.8 V T08
2020-03-02 07:33:15 C 05 23 52.36 +70 36 47.2 V T08
2020-03-02 07:34:35 C 05 23 52.44 +70 36 46.6 V T08
2020-03-02 07:40:48 C 05 23 52.99 +70 36 43.5 V T08
2020-03-02 07:55:24 C 05 23 54.22 +70 36 36.7 V T08
2020-03-02 17:55:07 C 05 24 47.39 +70 31 49.4 o C94
2020-03-02 18:11:46 C 05 24 48.81 +70 31 41.6 o C94
2020-03-02 23:08:06 C 05 25 15.22 +70 29 22.8 o L52
2020-03-02 23:18:09 C 05 25 16.06 +70 29 17.6 o L52
2020-03-03 05:41:28 C 05 25 50.57 +70 26 15.6 o Z22
2020-03-03 05:55:14 C 05 25 51.94 +70 26 08.9 o Z22
2020-03-03 18:26:27 C 05 26 59.06 +70 20 18.4 o C94
2020-03-03 18:46:31 C 05 27 00.87 +70 20 08.2 o C94
2020-03-03 18:49:52 C 05 27 01.11 +70 20 06.8 o C94
2020-03-03 19:06:55 C 05 27 02.41 +70 19 57.9 o C94
2020-03-05 00:27:17 C 05 29 42.82 +70 06 14.5 o L52
2020-03-05 00:59:03 C 05 29 45.81 +70 05 59.9 o L52
2020-03-05 12:49:08 C 05 30 51.54 +70 00 34.1 o C94
2020-03-05 13:05:46 C 05 30 53.06 +70 00 26.7 o C94
2020-03-05 21:34:49 C 05 31 39.90 +69 56 31.0 o Z22
2020-03-05 21:46:55 C 05 31 40.93 +69 56 25.0 o Z22
2020-03-06 00:48:24 C 05 31 57.64 +69 54 54.3 o L52
2020-03-06 00:58:27 C 05 31 58.40 +69 54 51.0 o L52
2020-03-06 09:26:05 C 05 32 45.58 +69 50 59.1 V T08
2020-03-06 09:33:53 C 05 32 46.26 +69 50 55.2 V T08
2020-03-06 09:37:58 C 05 32 46.64 +69 50 53.6 V T08
2020-03-06 21:44:26 C 05 33 55.02 +69 45 18.5 o Z22
2020-03-06 21:56:25 C 05 33 56.09 +69 45 12.8 o Z22
2020-03-07 16:54:02 C 05 35 43.58 +69 36 26.9 o L52
2020-03-07 17:10:46 C 05 35 45.15 +69 36 18.7 o L52
2020-03-07 23:45:55 C 05 36 22.62 +69 33 17.3 q I15
2020-03-07 23:52:24 C 05 36 23.23 +69 33 14.3 q I15
2020-03-08 00:00:36 C 05 36 23.97 +69 33 10.5 q I15
2020-03-15 02:38:30 C 05 53 04.96 +68 15 17.2 V 703
2020-03-15 02:47:30 C 05 53 05.73 +68 15 13.2 V 703
2020-03-15 02:56:29 C 05 53 06.61 +68 15 09.5 V 703
2020-03-15 03:05:28 C 05 53 07.57 +68 15 04.4 V 703
2020-03-16 18:15:52 C 05 57 04.40 +67 57 20.3 a 233
2020-03-16 18:25:57 C 05 57 05.36 +67 57 16.0 a 233
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)