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
2025-01-16 17:44:57 B 00 44 43.838 +13 36 21.49 V 160
2025-01-16 17:47:57 B 00 44 44.182 +13 36 29.02 V 160
2025-01-16 17:50:53 B 00 44 44.525 +13 36 36.72 V 160
2025-01-17 06:20:53 C 00 46 13.349 +14 08 08.12 V T08
2025-01-17 06:25:03 C 00 46 13.836 +14 08 18.46 V T08
2025-01-17 07:21:14 C 00 46 20.400 +14 10 38.57 V T08
2025-01-17 18:04:25 B 00 47 36.770 +14 37 11.68 V 160
2025-01-17 18:07:22 B 00 47 37.166 +14 37 19.52 V 160
2025-01-17 18:10:07 B 00 47 37.558 +14 37 27.01 V 160
2025-01-18 17:47:24 B 00 50 24.300 +15 34 58.91 V D69
2025-01-18 18:19:01 B 00 50 27.962 +15 36 14.87 V D69
2025-01-18 18:50:36 B 00 50 31.613 +15 37 30.47 V D69
2025-01-18 19:22:12 B 00 50 35.275 +15 38 46.14 V D69
2025-01-18 19:33:11 C 00 50 36.57 +15 39 14.6 V J53
2025-01-18 19:34:39 C 00 50 36.74 +15 39 18.1 V J53
2025-01-18 19:35:32 C 00 50 36.84 +15 39 20.1 V J53
2025-01-18 19:41:05 C 00 50 37.48 +15 39 33.4 V J53
2025-01-18 19:48:05 C 00 50 38.29 +15 39 50.2 V J53
2025-01-18 19:52:11 C 00 50 38.76 +15 40 00.0 V J53
2025-01-18 19:53:49 B 00 50 38.928 +15 40 01.63 V D69
2025-01-18 19:55:58 C 00 50 39.20 +15 40 09.1 V J53
2025-01-18 19:58:18 C 00 50 39.47 +15 40 14.7 V J53
2025-01-18 20:01:15 C 00 50 39.81 +15 40 21.8 V J53
2025-01-18 20:01:32 C 00 50 39.84 +15 40 22.4 V J53
2025-01-18 20:03:35 C 00 50 40.08 +15 40 27.4 V J53
2025-01-19 03:59:39 C 00 51 35.680 +15 59 24.83 V 703
2025-01-19 04:02:36 C 00 51 36.025 +15 59 31.74 V 703
2025-01-19 04:05:33 C 00 51 36.364 +15 59 38.72 V 703
2025-01-19 04:08:30 C 00 51 36.709 +15 59 45.71 V 703
2025-01-19 05:51:51 C 00 51 48.876 +16 03 53.71 V T05
2025-01-19 05:56:36 C 00 51 49.426 +16 04 04.98 V T05
2025-01-19 06:25:36 C 00 51 52.757 +16 05 13.63 V T05
2025-01-19 06:34:14 C 00 51 53.741 +16 05 33.94 V T05
2025-01-19 17:58:58 B 00 53 13.901 +16 32 23.64 V D69
2025-01-19 18:30:35 B 00 53 17.525 +16 33 37.51 V D69
2025-01-19 19:02:10 B 00 53 21.166 +16 34 51.20 V D69
2025-01-19 19:33:47 B 00 53 24.799 +16 36 04.90 V D69
2025-01-19 20:05:21 B 00 53 28.445 +16 37 18.44 V D69
2025-01-20 02:48:53 C 00 54 15.386 +16 53 00.89 V 703
2025-01-20 02:51:50 C 00 54 15.721 +16 53 07.76 V 703
2025-01-20 02:54:47 C 00 54 16.067 +16 53 14.60 V 703
2025-01-20 02:57:44 C 00 54 16.394 +16 53 21.41 V 703
2025-01-20 06:39:35 C 00 54 42.046 +17 01 56.21 V T08
2025-01-20 06:40:15 C 00 54 42.110 +17 01 57.68 V T08
2025-01-20 06:43:35 C 00 54 42.506 +17 02 05.50 V T08
2025-01-20 06:58:16 C 00 54 44.179 +17 02 39.26 V T08
2025-01-20 06:59:36 C 00 54 44.335 +17 02 42.29 V T08
2025-01-20 07:06:16 C 00 54 45.098 +17 02 57.59 V T08
2025-01-21 04:27:37 C 00 57 13.468 +17 51 38.02 V 703
2025-01-21 04:30:57 C 00 57 13.831 +17 51 45.50 V 703
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)