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
2016-06-09 02:27:19 C 13 47 05.26 +15 42 09.0 u H21
2016-06-09 02:29:49 C 13 47 05.15 +15 42 07.4 u H21
2016-06-09 02:32:19 C 13 47 05.04 +15 42 05.7 u H21
2016-06-09 03:47:14 C 13 47 01.73 +15 41 16.9 q H45
2016-06-09 03:48:39 C 13 47 01.67 +15 41 15.9 q H45
2016-06-09 03:50:03 C 13 47 01.61 +15 41 15.0 q H45
2016-06-09 03:51:25 C 13 47 01.55 +15 41 14.0 q H45
2016-06-09 03:53:02 C 13 47 01.48 +15 41 13.0 q H45
2016-06-09 03:54:53 C 13 47 01.40 +15 41 11.8 q H45
2016-06-10 02:25:48 C 13 46 04.40 +15 26 21.7 u H21
2016-06-10 02:28:18 C 13 46 04.30 +15 26 20.1 u H21
2016-06-10 02:30:48 C 13 46 04.19 +15 26 18.4 u H21
2016-06-10 02:33:19 C 13 46 04.08 +15 26 16.8 u H21
2016-06-10 02:35:50 C 13 46 03.97 +15 26 15.0 u H21
2016-06-10 02:38:20 C 13 46 03.87 +15 26 13.4 u H21
2016-06-10 02:40:50 C 13 46 03.76 +15 26 11.7 u H21
2016-06-10 02:44:35 C 13 46 03.60 +15 26 09.3 u H21
2016-06-11 02:08:21 C 13 45 06.38 +15 10 33.2 u H21
2016-06-11 02:10:51 C 13 45 06.28 +15 10 31.4 u H21
2016-06-11 02:13:21 C 13 45 06.17 +15 10 29.9 u H21
2016-06-11 02:15:51 C 13 45 06.08 +15 10 28.2 u H21
2016-06-11 02:18:21 C 13 45 05.96 +15 10 26.4 u H21
2016-06-11 02:20:52 C 13 45 05.86 +15 10 24.7 u H21
2016-06-11 02:23:22 C 13 45 05.76 +15 10 23.1 u H21
2016-06-11 02:25:52 C 13 45 05.66 +15 10 21.3 u H21
2016-06-11 02:28:22 C 13 45 05.55 +15 10 19.8 u H21
2016-06-11 02:30:52 C 13 45 05.44 +15 10 18.1 u H21
2016-06-11 02:34:53 C 13 45 05.28 +15 10 15.3 u H21
2016-06-11 04:12:56 C 13 45 01.26 +15 09 09.4 q H45
2016-06-11 04:14:24 C 13 45 01.20 +15 09 08.5 q H45
2016-06-11 04:15:57 C 13 45 01.14 +15 09 07.4 q H45
2016-06-11 04:17:24 C 13 45 01.07 +15 09 06.4 q H45
2016-06-11 04:18:51 C 13 45 01.01 +15 09 05.4 q H45
2016-06-11 04:20:08 C 13 45 00.96 +15 09 04.5 q H45
2016-06-12 02:19:26 C 13 44 09.37 +14 54 13.9 u H21
2016-06-12 02:21:56 C 13 44 09.27 +14 54 12.3 u H21
2016-06-12 02:24:27 C 13 44 09.17 +14 54 10.6 u H21
2016-06-12 02:26:57 C 13 44 09.08 +14 54 08.8 u H21
2016-06-12 02:29:27 C 13 44 08.97 +14 54 07.2 u H21
2016-06-12 02:31:58 C 13 44 08.87 +14 54 05.6 u H21
2016-06-12 02:34:28 C 13 44 08.78 +14 54 03.8 u H21
2016-06-12 02:36:58 C 13 44 08.67 +14 54 02.0 u H21
2016-06-12 02:39:28 C 13 44 08.58 +14 54 00.4 u H21
2016-06-12 02:41:28 C 13 44 08.49 +14 53 58.9 u H21
2016-06-12 02:43:58 C 13 44 08.39 +14 53 57.4 u H21
2016-06-13 02:19:46 C 13 43 15.00 +14 37 51.1 u H21
2016-06-13 02:22:16 C 13 43 14.91 +14 37 49.3 u H21
2016-06-13 02:24:46 C 13 43 14.82 +14 37 47.5 u H21
2016-06-13 02:27:16 C 13 43 14.71 +14 37 45.9 u H21
2016-06-13 02:29:46 C 13 43 14.63 +14 37 44.2 u H21
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)