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
2010-06-10 04:15:42 C 11 27 19.51 +45 15 01.9 r 703
2010-06-10 04:23:09 C 11 27 19.62 +45 14 57.4 r 703
2011-02-11 12:41:22 C 16 12 06.87 +02 29 01.6 r 703
2011-02-11 12:48:53 C 16 12 07.16 +02 29 00.8 r 703
2011-02-11 12:56:25 C 16 12 07.41 +02 29 00.4 r 703
2011-02-11 13:03:58 C 16 12 07.70 +02 29 00.3 r 703
2011-03-15 06:50:23 C 16 32 02.53 +02 24 55.5 c I28
2011-03-15 07:03:11 C 16 32 02.70 +02 24 56.0 c I28
2011-03-15 07:16:48 C 16 32 02.84 +02 24 56.1 c I28
2011-03-28 08:31:42 C 16 33 08.53 +02 34 52.0 c I28
2011-03-28 08:44:40 C 16 33 08.45 +02 34 52.6 c I28
2011-03-28 08:58:03 C 16 33 08.35 +02 34 52.9 c I28
2011-04-06 02:42:12 C 16 30 29.61 +02 39 39.3 c A24
2011-04-06 02:43:15 C 16 30 29.59 +02 39 39.4 c A24
2011-04-10 01:45:12 C 16 28 14.30 +02 40 03.9 c A24
2011-04-10 01:46:14 C 16 28 14.28 +02 40 03.8 c A24
2011-04-10 02:54:49 C 16 28 12.29 +02 40 03.5 c A24
2011-04-10 02:55:52 C 16 28 12.26 +02 40 03.6 c A24
2011-04-12 16:37:12 C 16 26 21.20 +02 39 26.3 o 300
2011-04-12 16:48:41 C 16 26 20.79 +02 39 26.1 o 300
2011-04-12 17:00:10 C 16 26 20.39 +02 39 25.9 o 300
2011-04-12 17:13:59 C 16 26 19.92 +02 39 26.0 o 300
2011-04-13 10:40:35 C 16 25 44.90 +02 39 04.5 r 703
2011-04-13 10:47:59 C 16 25 44.68 +02 39 04.3 r 703
2011-04-13 10:55:35 C 16 25 44.40 +02 39 04.1 r 703
2011-04-13 11:03:10 C 16 25 44.11 +02 39 03.9 r 703
2011-04-13 14:44:39 C 16 25 36.87 +02 38 59.4 o 300
2011-04-13 14:47:16 C 16 25 36.83 +02 38 58.5 o 300
2011-04-13 14:49:51 C 16 25 36.64 +02 38 59.3 o 300
2011-04-21 23:11:54 C 16 16 58.20 +02 28 44.0 c A24
2011-04-21 23:12:56 C 16 16 58.13 +02 28 44.2 c A24
2011-04-24 09:33:54 C 16 13 46.05 +02 23 10.6 o 691
2011-04-24 09:59:26 C 16 13 44.48 +02 23 07.5 o 691
2011-04-24 09:59:46 C 16 13 44.47 +02 23 07.6 r 703
2011-04-24 10:10:01 C 16 13 43.89 +02 23 06.4 r 703
2011-04-24 10:20:18 C 16 13 43.35 +02 23 05.2 r 703
2011-04-24 10:24:55 C 16 13 43.13 +02 23 05.0 o 691
2011-04-24 10:30:36 C 16 13 42.67 +02 23 04.4 r 703
2011-04-28 08:21:40 C 16 07 53.65 +02 10 57.9 c 704
2011-04-28 08:37:18 C 16 07 52.71 +02 10 55.7 c 704
2011-04-28 08:52:45 C 16 07 51.61 +02 10 54.1 c 704
2011-04-28 09:07:50 C 16 07 50.55 +02 10 51.9 c 704
2011-04-28 09:22:58 C 16 07 49.54 +02 10 48.9 c 704
2011-04-28 09:28:28 C 16 07 49.22 +02 10 47.9 o 691
2011-04-28 09:53:59 C 16 07 47.48 +02 10 44.0 o 691
2011-04-28 10:19:31 C 16 07 45.72 +02 10 39.9 o 691
2011-05-01 23:18:52 C 16 01 46.38 +01 55 49.7 c A24
2011-05-01 23:19:55 C 16 01 46.30 +01 55 49.5 c A24
2011-05-01 23:42:28 C 16 01 44.59 +01 55 45.0 c A24
2011-05-02 00:28:36 C 16 01 41.09 +01 55 35.9 c A24
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)