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
2025-01-12 00:32:04 C 00 30 57.82 +08 31 05.6 q W44
2025-01-12 03:27:08 C 00 31 19.535 +08 39 26.78 V 703
2025-01-12 03:30:24 C 00 31 19.888 +08 39 36.00 V 703
2025-01-12 03:33:41 C 00 31 20.312 +08 39 44.82 V 703
2025-01-12 03:36:56 C 00 31 20.644 +08 39 52.24 V 703
2025-01-12 16:58:50 B 00 33 00.487 +09 17 44.41 X K87
2025-01-12 17:00:52 B 00 33 00.732 +09 17 50.03 X K87
2025-01-12 17:02:53 B 00 33 00.972 +09 17 55.72 X K87
2025-01-12 18:04:21 B 00 33 08.419 +09 20 49.42 V 160
2025-01-12 18:06:02 B 00 33 08.626 +09 20 53.81 V 160
2025-01-12 18:08:27 B 00 33 08.909 +09 21 00.76 V 160
2025-01-12 18:10:56 B 00 33 09.228 +09 21 08.24 V 160
2025-01-12 18:12:30 B 00 33 09.403 +09 21 12.28 V 160
2025-01-12 20:17:38 C 00 33 24.63 +09 27 02.5 V M14
2025-01-12 20:31:58 C 00 33 26.40 +09 27 42.7 V M14
2025-01-12 20:46:36 C 00 33 28.20 +09 28 23.8 V M14
2025-01-13 03:02:22 C 00 34 14.455 +09 45 54.32 V 703
2025-01-13 03:05:38 C 00 34 14.959 +09 46 04.62 V 703
2025-01-13 03:08:55 C 00 34 15.359 +09 46 13.73 V 703
2025-01-13 03:12:10 C 00 34 15.755 +09 46 22.62 V 703
2025-01-13 17:51:51 C 00 36 03.87 +10 26 51.2 Z Y76
2025-01-13 17:54:58 C 00 36 04.26 +10 26 59.8 Z Y76
2025-01-13 17:55:31 C 00 36 04.318 +10 26 59.21 Z C23
2025-01-13 18:12:10 C 00 36 06.36 +10 27 46.9 Z Y76
2025-01-13 18:15:14 C 00 36 06.72 +10 27 55.4 Z Y76
2025-01-13 18:29:24 C 00 36 08.388 +10 28 31.94 Z C23
2025-01-13 19:16:52 B 00 36 14.14 +10 30 42.9 Z R69
2025-01-13 19:22:56 B 00 36 14.84 +10 30 57.5 Z R69
2025-01-13 19:35:03 B 00 36 16.31 +10 31 31.9 Z R69
2025-01-13 19:36:18 C 00 36 16.462 +10 31 34.90 Z C23
2025-01-14 05:48:23 C 00 37 31.006 +10 59 24.50 V T05
2025-01-14 05:59:41 C 00 37 32.350 +10 59 54.96 V T05
2025-01-14 06:04:21 C 00 37 32.916 +11 00 07.63 V T05
2025-01-14 06:18:54 C 00 37 34.646 +11 00 46.80 V T05
2025-01-14 17:20:22 C 00 38 55.238 +11 30 21.20 X M26
2025-01-14 17:23:03 C 00 38 55.565 +11 30 28.30 X M26
2025-01-14 17:25:26 C 00 38 55.855 +11 30 34.78 X M26
2025-01-14 18:27:31 B 00 39 03.252 +11 33 20.23 V 160
2025-01-14 18:32:50 B 00 39 03.871 +11 33 34.45 V 160
2025-01-14 23:06:07 C 00 39 37.00 +11 45 41.7 q W44
2025-01-14 23:06:50 C 00 39 37.17 +11 45 44.9 q W44
2025-01-14 23:40:46 C 00 39 41.14 +11 47 13.9 q W44
2025-01-15 06:00:21 C 00 40 26.786 +12 04 01.45 V T08
2025-01-15 06:05:02 C 00 40 27.343 +12 04 13.84 V T08
2025-01-15 06:12:24 C 00 40 28.212 +12 04 33.13 V T08
2025-01-15 06:31:09 C 00 40 30.432 +12 05 22.45 V T08
2025-01-15 06:36:36 C 00 40 31.087 +12 05 36.64 V T05
2025-01-15 06:41:17 C 00 40 31.637 +12 05 48.95 V T05
2025-01-15 07:06:33 C 00 40 34.639 +12 06 55.22 V T05
2025-01-15 07:14:31 C 00 40 35.592 +12 07 16.07 V T05
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)