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
2016-06-13 02:32:16 C 13 43 14.52 +14 37 42.6 u H21
2016-06-13 02:34:47 C 13 43 14.44 +14 37 40.8 u H21
2016-06-13 02:37:17 C 13 43 14.33 +14 37 39.0 u H21
2016-06-13 02:39:09 C 13 43 14.27 +14 37 37.9 u H21
2016-06-14 04:31:18 C 13 42 18.10 +14 19 47.2 V G45
2016-06-14 04:54:44 C 13 42 17.26 +14 19 31.2 V G45
2016-06-14 05:26:45 C 13 42 16.08 +14 19 08.7 V G45
2016-06-14 05:59:00 C 13 42 14.92 +14 18 46.3 V G45
2016-06-14 06:56:38 C 13 42 12.84 +14 18 06.2 V G45
2016-06-14 08:01:13 C 13 42 10.54 +14 17 21.0 V G45
2016-06-17 02:15:19 C 13 39 59.61 +13 30 45.3 q H21
2016-06-17 02:20:17 C 13 39 59.48 +13 30 41.6 q H21
2016-06-17 02:25:16 C 13 39 59.29 +13 30 38.2 q H21
2016-06-17 02:30:26 C 13 39 59.13 +13 30 34.6 q H21
2016-06-17 02:35:36 C 13 39 58.97 +13 30 30.9 q H21
2016-06-17 02:40:45 C 13 39 58.79 +13 30 27.0 q H21
2016-06-17 02:45:55 C 13 39 58.63 +13 30 23.4 q H21
2016-06-17 20:41:22 C 13 39 25.94 +13 17 40.8 o K95
2016-06-17 21:05:44 C 13 39 25.20 +13 17 23.7 o K95
2016-06-17 21:16:07 C 13 39 24.89 +13 17 15.8 o K95
2016-06-17 21:17:41 C 13 39 24.81 +13 17 14.9 o K95
2016-06-17 21:25:52 C 13 39 24.63 +13 17 02.9 q 160
2016-06-17 21:28:20 C 13 39 24.55 +13 17 01.0 q 160
2016-06-17 21:30:50 C 13 39 24.48 +13 16 59.3 q 160
2016-06-18 02:13:11 C 13 39 16.24 +13 13 37.0 q H21
2016-06-18 02:17:32 C 13 39 16.11 +13 13 34.2 q H21
2016-06-18 02:21:52 C 13 39 15.98 +13 13 31.0 q H21
2016-06-18 02:26:12 C 13 39 15.85 +13 13 28.0 q H21
2016-06-18 02:30:30 C 13 39 15.71 +13 13 24.9 q H21
2016-06-18 02:34:48 C 13 39 15.58 +13 13 21.8 q H21
2016-06-18 02:39:54 C 13 39 15.42 +13 13 17.9 q H21
2016-06-19 02:25:46 C 13 38 34.58 +12 56 10.7 q H21
2016-06-19 02:29:53 C 13 38 34.48 +12 56 07.8 q H21
2016-06-19 02:34:01 C 13 38 34.37 +12 56 04.9 q H21
2016-06-19 02:38:09 C 13 38 34.23 +12 56 01.8 q H21
2016-06-19 02:42:17 C 13 38 34.11 +12 55 58.7 q H21
2016-06-19 02:46:25 C 13 38 33.99 +12 55 55.7 q H21
2016-06-19 02:50:21 C 13 38 33.88 +12 55 52.8 q H21
2016-06-19 04:29:47 C 13 38 31.09 +12 54 41.4 u 926
2016-06-19 04:53:41 C 13 38 30.39 +12 54 24.1 u 926
2016-06-19 05:17:19 C 13 38 29.71 +12 54 06.8 u 926
2016-06-19 07:25:38 C 13 38 26.24 +12 52 35.5 L T05
2016-06-19 07:43:38 C 13 38 25.71 +12 52 22.4 L T05
2016-06-19 08:01:47 C 13 38 25.19 +12 52 09.1 L T05
2016-06-19 08:22:46 C 13 38 24.59 +12 51 54.1 L T05
2016-06-20 02:22:24 C 13 37 55.57 +12 38 48.0 q H21
2016-06-20 02:26:45 C 13 37 55.44 +12 38 45.0 q H21
2016-06-20 02:31:06 C 13 37 55.32 +12 38 41.7 q H21
2016-06-20 02:35:27 C 13 37 55.21 +12 38 38.6 q H21
2016-06-20 02:40:01 C 13 37 55.08 +12 38 35.2 q 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)