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
2005-04-01 06:54:32 C 13 20 48.72 +51 54 49.0 c 704
2005-04-01 07:09:49 C 13 20 47.54 +51 54 49.4 c 704
2005-04-01 07:25:20 C 13 20 46.36 +51 54 50.7 c 704
2005-04-01 07:40:43 C 13 20 45.11 +51 54 51.5 c 704
2005-04-01 07:55:27 C 13 20 43.98 +51 54 52.1 c 704
2005-04-02 22:05:51 C 13 17 48.58 +51 56 33.7 c A31
2005-04-02 22:09:59 C 13 17 48.28 +51 56 33.6 c A31
2005-04-02 22:14:07 C 13 17 47.98 +51 56 33.7 c A31
2005-04-02 22:18:14 C 13 17 47.64 +51 56 34.0 c A31
2005-04-04 20:29:30 C 13 14 15.02 +51 56 59.9 o 084
2005-04-04 20:34:08 C 13 14 14.66 +51 57 00.1 o 084
2005-04-07 00:45:29 C 13 10 14.93 +51 55 23.8 o 084
2005-04-07 00:50:07 C 13 10 14.52 +51 55 23.7 o 084
2005-04-14 23:11:56 C 12 56 06.91 +51 30 53.8 o 084
2005-04-14 23:16:35 C 12 56 06.56 +51 30 53.0 o 084
2005-04-16 22:00:47 C 12 52 49.06 +51 20 33.5 o 084
2005-04-17 22:52:46 C 12 51 06.08 +51 14 24.3 o 084
2005-04-17 22:56:58 C 12 51 05.79 +51 14 23.2 o 084
2005-04-18 22:45:35 C 12 49 28.87 +51 08 05.2 o 084
2005-04-18 22:49:46 C 12 49 28.58 +51 08 03.7 o 084
2005-04-25 22:16:37 C 12 38 55.70 +50 12 53.6 o 084
2005-04-25 22:20:47 C 12 38 55.48 +50 12 52.4 o 084
2005-04-26 23:30:30 C 12 37 28.47 +50 03 02.8 o 084
2005-04-29 05:52:13 C 12 34 28.60 +49 40 38.6 c 704
2005-04-29 06:07:24 C 12 34 27.74 +49 40 31.7 c 704
2005-04-29 06:22:01 C 12 34 26.93 +49 40 25.9 c 704
2005-04-29 06:58:08 C 12 34 24.96 +49 40 09.7 c 704
2005-05-02 22:53:20 C 12 29 57.48 +49 00 24.0 o 084
2005-05-08 00:22:33 C 12 24 37.14 +47 59 24.7 o 493
2005-05-08 00:27:31 C 12 24 36.94 +47 59 22.1 o 493
2005-06-06 04:47:00 C 12 11 34.83 +40 42 31.6 r 703
2005-06-06 05:10:51 C 12 11 34.76 +40 42 15.3 r 703
2005-06-06 05:22:58 C 12 11 34.76 +40 42 07.1 r 703
2005-06-20 04:38:13 C 12 14 02.29 +36 51 09.7 c 704
2005-06-20 04:52:20 C 12 14 02.54 +36 50 58.5 c 704
2005-06-20 05:06:29 C 12 14 02.75 +36 50 50.2 c 704
2005-06-30 04:22:57 C 12 18 16.00 +34 05 16.3 c 704
2005-06-30 04:37:17 C 12 18 16.28 +34 05 05.7 c 704
2005-06-30 04:51:54 C 12 18 16.63 +34 04 56.0 c 704
2005-06-30 05:06:10 C 12 18 16.93 +34 04 45.8 c 704
2006-02-01 12:43:36 C 16 46 49.44 -10 07 14.3 r 703
2006-02-01 12:47:30 C 16 46 49.69 -10 07 15.4 r 703
2006-02-01 12:51:25 C 16 46 49.94 -10 07 16.5 r 703
2006-02-01 12:55:17 C 16 46 50.19 -10 07 18.1 r 703
2006-05-06 16:58:37 C 19 31 43.34 -36 33 31.8 r 423
2006-05-06 17:01:18 C 19 31 43.64 -36 33 37.0 r 423
2006-05-06 17:03:58 C 19 31 43.94 -36 33 42.2 r 423
2006-05-06 17:05:58 C 19 31 44.17 -36 33 46.1 r 423
2006-05-06 17:09:52 C 19 31 44.61 -36 33 53.6 r 423
2006-05-06 17:11:11 C 19 31 44.76 -36 33 56.1 r 423
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)