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
2011-12-23 09:06:41 C 23 51 45.76 -06 16 08.2 u 379
2011-12-23 09:09:21 C 23 51 46.13 -06 15 56.2 u 379
2011-12-23 09:12:02 C 23 51 46.54 -06 15 44.1 u 379
2011-12-23 09:19:10 C 23 51 47.55 -06 15 11.9 u 379
2011-12-23 09:21:00 C 23 51 47.80 -06 15 03.9 u 379
2011-12-23 20:16:03 C 23 53 22.24 -05 26 22.2 r A06
2011-12-23 20:31:30 C 23 53 24.45 -05 25 12.7 r A06
2011-12-23 20:43:01 C 23 53 26.07 -05 24 22.5 r A06
2011-12-24 09:05:42 C 23 55 12.69 -04 29 47.1 u 379
2011-12-24 09:07:18 C 23 55 12.90 -04 29 39.9 u 379
2011-12-24 09:09:57 C 23 55 13.28 -04 29 28.5 u 379
2011-12-24 09:13:41 C 23 55 13.79 -04 29 12.0 u 379
2011-12-25 02:54:14 C 23 57 42.94 -03 12 28.1 r 703
2011-12-25 03:04:05 C 23 57 44.35 -03 11 46.1 r 703
2011-12-25 03:13:57 C 23 57 45.72 -03 11 03.7 r 703
2011-12-25 03:23:51 C 23 57 47.05 -03 10 21.1 r 703
2011-12-26 08:30:40 C 00 01 48.48 -01 07 12.1 u 379
2011-12-26 08:31:35 C 00 01 48.57 -01 07 08.3 u 379
2011-12-26 08:49:41 C 00 01 51.01 -01 05 52.7 u 379
2012-01-02 20:00:54 C 00 24 39.51 +10 02 29.0 d J99
2012-01-04 03:16:05 C 00 28 22.72 +11 43 39.7 r 703
2012-01-04 03:23:30 C 00 28 23.59 +11 44 03.2 r 703
2012-01-04 03:31:00 C 00 28 24.45 +11 44 26.9 r 703
2012-01-04 03:38:26 C 00 28 25.32 +11 44 50.4 r 703
2012-01-04 20:06:10 C 00 30 21.40 +12 36 17.9 d J99
2012-01-04 20:10:19 C 00 30 21.93 +12 36 31.6 d J99
2012-01-04 20:11:05 C 00 30 22.00 +12 36 34.2 d J99
2012-01-05 19:48:08 C 00 33 07.03 +13 48 20.3 o J16
2012-01-05 19:58:58 C 00 33 08.29 +13 48 52.5 o J16
2012-01-05 20:13:41 C 00 33 09.93 +13 49 36.8 o J16
2012-01-05 20:22:30 C 00 33 10.95 +13 50 03.1 o J16
2012-01-07 09:21:00 C 00 37 25.62 +15 37 46.1 u 379
2012-01-07 09:22:03 C 00 37 25.73 +15 37 49.2 u 379
2012-01-07 09:23:28 C 00 37 25.90 +15 37 52.8 u 379
2012-01-07 09:24:09 C 00 37 25.99 +15 37 55.1 u 379
2012-01-07 09:24:52 C 00 37 26.06 +15 37 56.8 u 379
2012-01-07 09:25:33 C 00 37 26.11 +15 37 58.8 u 379
2012-01-07 09:33:23 C 00 37 27.01 +15 38 21.3 u 379
2012-01-07 09:34:25 C 00 37 27.13 +15 38 24.3 u 379
2012-01-07 12:09:25 C 00 37 44.44 +15 45 41.8 o 300
2012-01-07 12:12:01 C 00 37 44.73 +15 45 49.0 o 300
2012-01-07 12:15:56 C 00 37 45.15 +15 46 00.0 o 300
2012-01-07 12:21:09 C 00 37 45.75 +15 46 14.9 o 300
2012-01-07 12:23:45 C 00 37 46.03 +15 46 21.6 o 300
2012-01-19 19:15:04 C 01 09 54.97 +27 08 46.2 d J99
2012-01-21 19:13:28 C 01 14 59.68 +28 36 14.3 c A24
2012-01-21 19:13:50 C 01 14 59.73 +28 36 15.0 c A24
2012-01-21 21:17:50 C 01 15 12.70 +28 39 52.4 c A24
2012-01-21 21:18:12 C 01 15 12.73 +28 39 53.2 c A24
2012-01-22 18:58:07 C 01 17 30.29 +29 17 34.7 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)