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
2024-05-27 19:39:31 C 14 49 26.50 +01 37 33.6 X G02
2024-05-27 19:45:38 C 14 49 25.90 +01 37 30.2 X G02
2024-05-28 08:36:33 C 14 48 09.929 +01 30 09.68 V 703
2024-05-28 08:39:54 C 14 48 09.594 +01 30 07.78 V 703
2024-05-28 08:43:14 C 14 48 09.263 +01 30 05.83 V 703
2024-05-28 08:46:34 C 14 48 08.924 +01 30 03.85 V 703
2024-05-28 09:33:28 C 14 48 04.582 +01 29 38.47 V T08
2024-05-28 09:38:07 C 14 48 04.109 +01 29 35.81 V T08
2024-05-28 09:45:42 C 14 48 03.365 +01 29 31.52 V T08
2024-05-28 10:15:34 C 14 48 00.367 +01 29 14.17 V T08
2024-05-29 03:35:33 C 14 46 19.080 +01 19 13.22 V W68
2024-05-29 06:37:13 C 14 46 01.090 +01 17 26.02 V W68
2024-05-29 06:43:06 C 14 46 00.516 +01 17 22.60 V W68
2024-05-29 06:57:35 C 14 45 59.090 +01 17 13.81 V W68
2024-05-29 19:56:36 C 14 44 44.01 +01 09 19.3 X G02
2024-05-29 20:05:32 C 14 44 43.14 +01 09 13.9 X G02
2024-05-29 20:14:11 C 14 44 42.29 +01 09 08.5 X G02
2024-05-29 22:47:24 C 14 44 27.298 +01 07 36.52 Z C23
2024-05-29 22:51:05 C 14 44 26.993 +01 07 34.32 Z C23
2024-05-29 22:55:09 C 14 44 26.462 +01 07 31.94 Z C23
2024-05-30 09:29:51 C 14 43 25.234 +01 01 11.75 V T05
2024-05-30 09:34:24 C 14 43 24.782 +01 01 09.01 V T05
2024-05-30 09:43:31 C 14 43 23.887 +01 01 03.50 V T05
2024-05-30 10:02:20 C 14 43 22.032 +01 00 51.98 V T05
2024-05-30 16:38:21 C 14 42 44.015 +00 56 48.18 O18
2024-05-30 18:35:04 C 14 42 32.601 +00 55 36.65 O18
2024-05-31 03:37:08 C 14 41 41.114 +00 50 03.55 V G96
2024-05-31 03:45:15 C 14 41 40.322 +00 49 58.51 V G96
2024-05-31 03:53:25 C 14 41 39.523 +00 49 53.47 V G96
2024-05-31 04:01:35 C 14 41 38.724 +00 49 48.32 V G96
2024-06-01 07:54:51 C 14 38 58.942 +00 32 19.82 V 703
2024-06-01 07:58:11 C 14 38 58.621 +00 32 17.66 V 703
2024-06-01 08:01:31 C 14 38 58.297 +00 32 15.58 V 703
2024-06-01 08:04:51 C 14 38 57.973 +00 32 13.42 V 703
2024-06-01 08:43:32 C 14 38 54.586 +00 31 50.59 V T08
2024-06-01 08:48:17 C 14 38 54.120 +00 31 47.71 V T08
2024-06-01 08:57:48 C 14 38 53.201 +00 31 41.56 V T08
2024-06-01 09:18:22 C 14 38 51.209 +00 31 28.56 V T08
2024-06-02 03:11:27 C 14 37 10.162 +00 20 08.41 V W68
2024-06-02 03:16:01 C 14 37 09.722 +00 20 05.50 V W68
2024-06-02 03:24:33 C 14 37 08.909 +00 19 59.99 V W68
2024-06-02 03:39:51 C 14 37 07.435 +00 19 50.12 V W68
2024-06-02 19:57:05 C 14 35 36.32 +00 09 04.5 X G02
2024-06-02 20:06:52 C 14 35 35.39 +00 08 57.9 X G02
2024-06-02 20:15:48 C 14 35 34.55 +00 08 52.1 X G02
2024-06-02 21:02:21 C 14 35 30.245 +00 08 21.48 Z C23
2024-06-02 21:06:50 C 14 35 29.794 +00 08 18.89 Z C23
2024-06-02 21:12:03 C 14 35 29.311 +00 08 15.14 Z C23
2024-06-03 08:47:47 C 14 34 24.686 +00 00 40.93 V T05
2024-06-03 08:51:51 C 14 34 24.305 +00 00 38.30 V T05
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)