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
2008-04-06 10:08:26 C 14 43 25.62 +32 07 44.1 r H45
2008-04-06 10:11:17 C 14 43 25.46 +32 07 44.7 r H45
2008-04-06 10:14:28 C 14 43 25.30 +32 07 45.7 r H45
2008-04-15 05:30:40 C 14 30 17.17 +32 47 58.9 r 703
2008-04-15 05:39:16 C 14 30 16.63 +32 48 00.0 r 703
2008-04-15 05:47:50 C 14 30 16.05 +32 48 01.1 r 703
2008-04-15 05:56:24 C 14 30 15.48 +32 48 02.2 r 703
2008-04-24 22:28:28 C 14 14 29.16 +32 57 10.9 r B19
2008-04-24 22:31:17 C 14 14 29.00 +32 57 10.8 r B19
2008-04-24 22:34:07 C 14 14 28.78 +32 57 10.9 r B19
2008-04-27 09:17:55 C 14 10 25.64 +32 53 08.1 r 703
2008-04-27 09:28:58 C 14 10 24.85 +32 53 07.5 r 703
2008-04-27 09:40:01 C 14 10 24.09 +32 53 06.1 r 703
2008-04-27 09:51:02 C 14 10 23.34 +32 53 05.2 r 703
2008-04-28 00:03:25 C 14 09 24.86 +32 51 41.7 r 106
2008-04-28 00:24:32 C 14 09 23.39 +32 51 39.6 r 106
2008-04-28 00:45:38 C 14 09 21.92 +32 51 37.1 r 106
2008-04-28 01:06:43 C 14 09 20.46 +32 51 34.8 r 106
2008-04-28 23:03:13 C 14 07 50.06 +32 49 06.7 r 084
2008-04-28 23:07:26 C 14 07 49.79 +32 49 06.0 r 084
2008-04-29 21:38:02 C 14 06 17.50 +32 46 13.3 r B09
2008-04-29 21:41:30 C 14 06 17.26 +32 46 13.0 r B09
2008-04-29 21:45:40 C 14 06 16.97 +32 46 12.3 r B09
2008-05-01 00:36:57 C 14 04 27.09 +32 42 14.2 c J27
2008-05-01 01:08:59 C 14 04 24.85 +32 42 09.8 c J27
2008-05-02 21:24:04 C 14 01 25.61 +32 34 24.8 r B09
2008-05-02 21:33:54 C 14 01 24.92 +32 34 22.7 r B09
2008-05-03 08:20:43 C 14 00 41.32 +32 32 16.9 r 703
2008-05-03 08:29:30 C 14 00 40.68 +32 32 15.0 r 703
2008-05-03 08:38:05 C 14 00 40.10 +32 32 14.2 r 703
2008-05-03 08:46:39 C 14 00 39.52 +32 32 11.7 r 703
2008-05-03 22:07:41 C 13 59 46.29 +32 29 26.1 r B09
2008-05-03 22:11:32 C 13 59 45.99 +32 29 25.5 r B09
2008-05-06 00:18:39 C 13 56 27.35 +32 17 56.2 o 510
2008-05-06 00:21:02 C 13 56 27.13 +32 17 55.7 o 510
2008-05-06 00:25:47 C 13 56 26.87 +32 17 54.7 o 510
2008-05-06 22:33:31 C 13 55 00.71 +32 12 16.7 r J51
2008-05-06 22:45:39 C 13 54 59.91 +32 12 13.4 r J51
2008-05-06 22:57:45 C 13 54 59.11 +32 12 10.2 r J51
2008-05-09 23:23:12 C 13 50 22.71 +31 51 10.6 r B09
2008-05-09 23:27:05 C 13 50 22.50 +31 51 08.7 r B09
2008-05-10 20:09:33 C 13 49 05.72 +31 44 27.5 r 113
2008-05-10 20:13:11 C 13 49 05.51 +31 44 26.1 r 113
2008-05-10 20:17:08 C 13 49 05.24 +31 44 24.9 r 113
2008-05-11 04:17:55 C 13 48 35.62 +31 41 46.6 o H83
2008-05-11 04:51:47 C 13 48 33.51 +31 41 35.1 o H83
2008-05-11 05:02:30 C 13 48 32.82 +31 41 31.8 o H83
2008-05-11 05:12:16 C 13 48 32.26 +31 41 28.5 o H83
2008-05-13 03:20:26 C 13 45 45.54 +31 25 16.7 r 703
2008-05-13 03:27:46 C 13 45 45.10 +31 25 14.2 r 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)