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
2008-05-13 03:35:02 C 13 45 44.67 +31 25 11.1 r 703
2008-05-13 03:42:20 C 13 45 44.20 +31 25 08.9 r 703
2008-05-27 05:00:39 C 13 28 27.20 +28 48 44.8 o 704
2008-05-27 05:16:14 C 13 28 26.51 +28 48 36.2 o 704
2008-05-27 05:31:05 C 13 28 25.86 +28 48 28.0 o 704
2008-05-27 05:46:01 C 13 28 25.18 +28 48 19.7 o 704
2008-05-27 06:00:50 C 13 28 24.56 +28 48 11.5 o 704
2008-06-18 05:04:50 C 13 13 55.03 +23 12 53.6 r H53
2008-06-18 05:06:24 C 13 13 54.80 +23 12 52.8 r H53
2008-06-18 05:08:24 C 13 13 55.03 +23 12 50.6 r H53
2008-06-18 05:10:00 C 13 13 54.77 +23 12 49.9 r H53
2008-06-18 05:13:43 C 13 13 54.99 +23 12 47.0 r H53
2008-06-18 05:15:18 C 13 13 54.87 +23 12 46.4 r H53
2008-06-18 22:15:20 C 13 13 42.05 +23 00 53.6 c B37
2008-06-18 22:17:12 C 13 13 42.04 +23 00 53.0 c B37
2008-06-18 22:19:04 C 13 13 42.03 +23 00 51.3 c B37
2008-06-23 04:03:12 C 13 12 43.21 +21 49 00.6 r H53
2008-06-23 04:04:40 C 13 12 43.20 +21 48 59.4 r H53
2008-06-23 04:06:06 C 13 12 43.22 +21 48 58.1 r H53
2008-06-23 04:07:32 C 13 12 43.19 +21 48 57.3 r H53
2008-06-23 04:09:04 C 13 12 43.12 +21 48 55.2 r H53
2008-06-23 04:10:30 C 13 12 43.14 +21 48 54.9 r H53
2008-07-02 04:53:24 C 13 12 16.52 +19 12 28.8 r 703
2008-07-02 05:01:16 C 13 12 16.52 +19 12 22.7 r 703
2008-07-02 05:09:08 C 13 12 16.56 +19 12 17.1 r 703
2008-07-02 05:17:05 C 13 12 16.56 +19 12 11.0 r 703
2008-07-08 18:49:27 C 13 13 15.04 +17 16 43.8 17.5 o C20
2008-07-08 18:54:06 C 13 13 15.12 +17 16 40.3 17.1 o C20
2008-07-22 20:54:11 C 13 18 30.82 +13 07 50.2 r J75
2008-07-22 21:12:35 C 13 18 31.21 +13 07 36.5 r J75
2008-07-22 21:30:48 C 13 18 31.59 +13 07 23.0 r J75
2009-11-10 12:13:57 C 12 06 46.72 +39 54 46.8 r 703
2009-11-10 12:19:15 C 12 06 47.16 +39 54 47.2 r 703
2009-11-10 12:24:30 C 12 06 47.59 +39 54 47.8 r 703
2009-11-10 12:29:45 C 12 06 48.02 +39 54 48.4 r 703
2010-01-31 23:16:58 C 13 41 13.73 +53 34 56.2 u B67
2010-01-31 23:28:18 C 13 41 13.64 +53 35 03.6 u B67
2010-01-31 23:39:27 C 13 41 13.58 +53 35 11.0 u B67
2010-03-12 22:35:40 C 12 50 14.87 +61 39 34.9 17.6 u 084
2010-03-16 21:41:40 C 12 41 16.56 +61 53 49.3 17.5 u 084
2010-03-16 21:45:51 C 12 41 16.16 +61 53 49.6 17.6 u 084
2010-03-21 12:37:02 C 12 30 36.567 +61 59 45.47 L F51
2010-03-21 12:50:12 C 12 30 35.257 +61 59 45.25 L F51
2010-03-23 22:58:17 C 12 25 01.37 +61 58 11.8 17.3 u C20
2010-03-23 23:02:31 C 12 25 00.97 +61 58 11.5 17.4 u C20
2010-03-24 00:22:00 C 12 24 53.38 +61 58 06.2 17.7 u 084
2010-03-24 20:37:32 C 12 22 58.18 +61 56 49.3 17.3 u C20
2010-03-24 20:41:45 C 12 22 57.77 +61 56 49.0 17.4 u C20
2010-03-24 23:08:45 C 12 22 43.74 +61 56 37.2 17.3 u 084
2010-03-25 01:12:21 C 12 22 31.89 +61 56 27.3 17.6 u 084
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)