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
2015-03-09 07:17:43 C 10 38 18.05 +72 36 56.0 q H21
2015-03-09 07:26:55 C 10 38 16.80 +72 36 53.6 q H21
2015-03-09 18:41:50 C 10 36 49.58 +72 33 55.8 q K14
2015-03-09 18:57:27 C 10 36 47.42 +72 33 51.5 q K14
2015-03-15 17:31:11 C 10 19 52.38 +71 46 25.4 o C94
2015-03-15 17:44:42 C 10 19 50.94 +71 46 19.9 o C94
2015-03-15 17:57:41 C 10 19 49.45 +71 46 15.5 o C94
2015-04-01 03:32:32 C 09 51 38.23 +68 23 30.1 q H21
2015-04-01 03:36:08 C 09 51 38.03 +68 23 28.0 q H21
2015-04-01 03:40:00 C 09 51 37.86 +68 23 25.5 q H21
2015-04-01 03:43:52 C 09 51 37.72 +68 23 23.3 q H21
2015-04-01 03:47:44 C 09 51 37.59 +68 23 20.9 q H21
2015-04-01 03:51:36 C 09 51 37.38 +68 23 18.7 q H21
2015-04-01 03:55:28 C 09 51 37.22 +68 23 16.2 q H21
2015-04-04 07:36:09 C 09 49 02.324 +67 36 41.85 L F51
2015-04-04 07:55:23 C 09 49 01.714 +67 36 29.74 L F51
2015-04-05 04:31:43 C 09 48 27.33 +67 23 31.3 q H21
2015-04-05 04:37:24 C 09 48 27.17 +67 23 27.4 q H21
2015-04-05 04:43:03 C 09 48 27.02 +67 23 23.9 q H21
2015-04-05 04:48:27 C 09 48 26.87 +67 23 20.4 q H21
2015-04-05 04:53:51 C 09 48 26.74 +67 23 16.6 q H21
2015-04-05 04:59:13 C 09 48 26.54 +67 23 13.4 q H21
2015-04-05 05:02:46 C 09 48 26.43 +67 23 11.6 q H21
2015-04-09 19:19:29 C 09 46 17.04 +66 12 14.1 u C01
2015-04-09 19:21:36 C 09 46 17.02 +66 12 12.7 u C01
2015-04-09 19:23:42 C 09 46 16.97 +66 12 11.3 u C01
2015-04-09 19:25:47 C 09 46 16.94 +66 12 09.9 u C01
2015-04-09 19:27:54 C 09 46 16.91 +66 12 08.6 u C01
2015-04-09 20:46:45 C 09 46 15.74 +66 11 16.9 u C01
2015-04-09 20:49:08 C 09 46 15.70 +66 11 15.3 u C01
2015-04-09 20:51:29 C 09 46 15.67 +66 11 13.8 u C01
2015-04-09 20:53:52 C 09 46 15.63 +66 11 12.2 u C01
2015-04-09 20:56:15 C 09 46 15.59 +66 11 10.7 u C01
2015-04-18 20:09:29 C 09 45 43.75 +63 47 07.0 q K26
2015-04-18 20:51:12 C 09 45 43.97 +63 46 38.0 q K26
2015-04-19 20:01:43 C 09 45 55.23 +63 30 50.4 q K26
2015-04-19 20:34:16 C 09 45 55.51 +63 30 28.1 q K26
2015-04-29 02:14:19 C 09 49 37.51 +60 57 56.1 q H21
2015-04-29 02:16:29 C 09 49 37.55 +60 57 54.5 q H21
2015-04-29 02:18:39 C 09 49 37.58 +60 57 52.9 q H21
2015-04-29 02:20:49 C 09 49 37.65 +60 57 51.5 q H21
2015-04-29 02:22:59 C 09 49 37.68 +60 57 49.9 q H21
2015-04-29 02:25:09 C 09 49 37.74 +60 57 48.4 q H21
2015-04-29 02:27:20 C 09 49 37.78 +60 57 47.0 q H21
2015-04-30 04:46:35 C 09 50 15.84 +60 39 35.0 q 703
2015-04-30 04:57:49 C 09 50 16.17 +60 39 27.5 q 703
2015-04-30 05:09:01 C 09 50 16.39 +60 39 19.8 q 703
2015-04-30 05:20:12 C 09 50 16.67 +60 39 11.5 q 703
2015-05-01 02:42:23 C 09 50 49.45 +60 24 25.2 u H21
2015-05-01 02:45:14 C 09 50 49.49 +60 24 23.2 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)