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
2006-05-06 17:13:12 C 19 31 44.99 -36 34 00.1 r 423
2006-05-20 07:44:30 C 20 22 47.12 -49 28 48.6 o 808
2006-05-20 07:54:50 C 20 22 49.32 -49 29 17.6 o 808
2006-05-20 08:03:29 C 20 22 51.09 -49 29 41.8 o 808
2006-05-23 15:15:40 C 20 41 53.59 -53 17 38.2 r E12
2006-05-23 15:28:18 C 20 41 56.90 -53 18 15.9 r E12
2006-05-23 15:40:56 C 20 42 00.25 -53 18 53.5 r E12
2006-05-23 15:53:39 C 20 42 03.56 -53 19 31.2 r E12
2006-08-07 07:45:01 C 06 24 53.53 -25 15 36.9 r I77
2006-08-07 07:48:39 C 06 24 53.74 -25 15 30.8 r I77
2006-08-07 07:52:18 C 06 24 53.95 -25 15 24.6 r I77
2006-09-15 09:40:00 C 07 29 16.13 +01 34 04.5 m H07
2006-09-15 09:55:53 C 07 29 17.40 +01 34 31.5 m H07
2006-09-15 10:11:49 C 07 29 18.65 +01 34 59.4 m H07
2006-09-15 10:27:02 C 07 29 19.91 +01 35 25.4 m H07
2006-09-25 09:50:00 C 07 49 27.67 +08 29 39.8 m H07
2006-09-25 10:04:46 C 07 49 28.96 +08 30 05.4 m H07
2006-09-25 10:20:24 C 07 49 30.29 +08 30 32.7 m H07
2006-09-25 10:35:49 C 07 49 31.60 +08 30 59.1 m H07
2006-09-26 08:50:43 C 07 51 27.58 +09 09 37.0 m H07
2006-09-26 09:05:23 C 07 51 28.82 +09 10 02.4 m H07
2006-09-26 09:21:15 C 07 51 30.17 +09 10 29.6 m H07
2006-09-26 09:36:25 C 07 51 31.52 +09 10 56.5 m H07
2006-10-01 10:28:18 C 08 02 09.89 +12 41 30.8 m H07
2006-10-01 10:42:02 C 08 02 11.09 +12 41 55.0 m H07
2006-10-01 10:55:50 C 08 02 12.28 +12 42 19.2 m H07
2006-10-01 11:10:11 C 08 02 13.55 +12 42 44.3 m H07
2006-10-08 10:16:24 C 08 17 16.47 +17 36 33.8 c 699
2006-10-08 10:37:28 C 08 17 18.35 +17 37 11.3 c 699
2006-10-08 10:58:32 C 08 17 20.23 +17 37 48.8 c 699
2006-10-08 11:19:35 C 08 17 22.12 +17 38 26.3 c 699
2006-10-11 03:27:16 C 08 23 13.18 +19 32 16.0 r 204
2006-10-11 03:29:57 C 08 23 13.42 +19 32 20.9 r 204
2006-10-11 03:47:23 C 08 23 14.99 +19 32 52.1 r 204
2006-10-11 03:50:06 C 08 23 15.23 +19 32 56.9 r 204
2006-10-13 08:35:51 C 08 28 05.79 +21 07 11.6 m H07
2006-10-13 08:37:12 C 08 28 05.88 +21 07 13.9 m H07
2006-10-13 08:49:56 C 08 28 07.07 +21 07 36.8 m H07
2006-10-13 08:51:19 C 08 28 07.14 +21 07 39.6 m H07
2006-10-13 09:03:54 C 08 28 08.33 +21 08 01.9 m H07
2006-10-13 09:05:28 C 08 28 08.43 +21 08 04.6 m H07
2006-10-13 09:18:24 C 08 28 09.65 +21 08 28.2 m H07
2006-10-13 09:19:47 C 08 28 09.75 +21 08 30.9 m H07
2006-10-19 10:46:17 C 08 41 32.56 +25 31 17.6 c 704
2006-10-19 11:03:09 C 08 41 34.10 +25 31 48.9 c 704
2006-10-19 11:23:30 C 08 41 35.95 +25 32 26.1 c 704
2006-10-19 11:23:40 C 08 41 35.94 +25 32 26.6 c 704
2006-10-19 11:41:10 C 08 41 37.54 +25 32 58.1 c 704
2006-10-19 11:57:46 C 08 41 38.99 +25 33 29.1 c 704
2006-10-20 10:27:42 C 08 43 43.35 +26 14 34.5 c 704
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)