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
2011-06-03 21:01:11 C 14 43 59.18 -04 05 58.4 o 639
2011-06-05 06:05:10 C 14 40 33.02 -04 29 35.7 r 703
2011-06-05 06:18:22 C 14 40 31.62 -04 29 45.2 r 703
2011-06-05 06:31:45 C 14 40 30.21 -04 29 55.2 r 703
2011-06-05 06:45:10 C 14 40 28.81 -04 30 04.5 r 703
2011-06-06 20:56:55 C 14 36 34.93 -04 58 02.1 c A24
2011-06-06 20:57:17 C 14 36 34.92 -04 58 02.5 c A24
2011-06-06 22:04:54 C 14 36 27.88 -04 58 52.5 c A24
2011-06-06 22:05:19 C 14 36 27.85 -04 58 52.7 c A24
2011-06-19 20:52:10 C 14 08 19.08 -09 03 54.2 c A24
2011-06-19 20:52:32 C 14 08 19.05 -09 03 54.6 c A24
2011-06-19 22:00:19 C 14 08 13.63 -09 04 50.3 c A24
2011-06-19 22:00:42 C 14 08 13.61 -09 04 50.5 c A24
2011-06-20 20:33:30 C 14 06 29.40 -09 23 27.0 c A24
2011-06-20 20:33:52 C 14 06 29.36 -09 23 27.7 c A24
2011-06-20 21:41:43 C 14 06 24.09 -09 24 23.4 c A24
2011-06-20 21:42:05 C 14 06 24.06 -09 24 23.7 c A24
2011-06-21 04:08:48 C 14 05 54.88 -09 29 42.6 u 703
2011-06-21 04:16:07 C 14 05 54.31 -09 29 48.7 u 703
2011-06-21 04:23:28 C 14 05 53.73 -09 29 54.8 u 703
2011-06-21 04:30:51 C 14 05 53.16 -09 30 00.6 u 703
2011-06-24 04:12:31 C 14 00 42.62 -10 29 40.6 c 704
2011-06-24 04:27:23 C 14 00 41.58 -10 29 53.2 c 704
2011-06-24 04:42:31 C 14 00 40.55 -10 30 05.9 c 704
2011-06-24 04:57:24 C 14 00 39.38 -10 30 19.8 c 704
2011-06-24 05:12:46 C 14 00 38.34 -10 30 30.7 c 704
2011-06-30 03:26:49 C 13 51 47.56 -12 30 21.2 r H53
2011-06-30 03:36:49 C 13 51 47.00 -12 30 29.9 r H53
2011-06-30 03:46:47 C 13 51 46.44 -12 30 38.3 r H53
2011-06-30 03:56:46 C 13 51 45.85 -12 30 46.7 r H53
2011-06-30 04:07:00 C 13 51 45.24 -12 30 55.6 r H53
2011-06-30 04:12:58 C 13 51 44.93 -12 31 00.3 r H53
2011-07-20 08:56:54 C 13 35 14.522 -19 27 09.66 u E12
2011-07-20 09:22:19 C 13 35 14.108 -19 27 31.65 u E12
2011-07-20 09:35:04 C 13 35 13.901 -19 27 42.75 u E12
2011-08-25 08:07:23 C 13 46 34.56 -32 41 05.1 u 432
2011-08-25 08:31:18 C 13 46 35.42 -32 41 28.7 u 432
2011-08-26 08:06:05 C 13 47 29.04 -33 04 53.8 u 432
2011-08-26 08:29:49 C 13 47 29.94 -33 05 16.9 u 432
2011-12-13 10:58:16 C 23 11 52.987 -25 32 40.73 r E12
2011-12-13 11:08:34 C 23 11 54.956 -25 31 48.59 r E12
2011-12-13 11:18:56 C 23 11 56.953 -25 30 56.05 r E12
2011-12-13 11:29:12 C 23 11 58.925 -25 30 03.91 r E12
2011-12-18 16:04:07 C 23 34 17.21 -15 07 45.2 u 089
2011-12-18 16:05:43 C 23 34 17.51 -15 07 37.3 u 089
2011-12-18 16:07:19 C 23 34 17.75 -15 07 29.3 u 089
2011-12-18 16:08:55 C 23 34 18.02 -15 07 22.1 u 089
2011-12-18 16:10:31 C 23 34 18.26 -15 07 14.1 u 089
2011-12-23 08:38:30 C 23 51 41.76 -06 18 14.5 u 379
2011-12-23 08:54:37 C 23 51 44.06 -06 17 02.1 u 379
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)