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
2023-07-05 06:12:31 C 11 40 27.672 +39 11 56.69 V T05
2023-07-05 06:25:34 C 11 40 28.140 +39 11 47.90 V T05
2023-07-05 06:40:11 C 11 40 28.716 +39 11 38.22 V T05
2023-07-08 06:31:30 C 11 43 21.151 +38 24 15.08 V T05
2023-07-08 06:38:40 C 11 43 21.377 +38 24 09.29 V T05
2023-07-08 06:43:13 C 11 43 21.660 +38 24 06.88 V T05
2023-07-08 06:56:54 C 11 43 22.190 +38 23 57.23 V T05
2023-07-14 06:59:44 C 11 49 20.892 +36 49 57.00 V T05
2023-07-14 07:04:18 C 11 49 20.950 +36 49 53.51 V T05
2023-07-14 07:13:02 C 11 49 21.461 +36 49 47.35 V T05
2023-07-14 07:28:12 C 11 49 22.034 +36 49 38.82 V T05
2023-07-16 07:04:53 C 11 51 24.185 +36 18 51.98 V T05
2023-07-16 07:15:06 C 11 51 24.554 +36 18 45.43 V T05
2023-07-16 07:29:39 C 11 51 25.147 +36 18 35.71 V T05
2023-07-16 07:34:15 C 11 51 25.402 +36 18 33.01 V T05
2023-07-21 06:50:13 C 11 56 38.174 +35 02 10.32 V T05
2023-07-21 06:55:05 C 11 56 38.342 +35 02 06.79 V T05
2023-07-21 07:11:59 C 11 56 39.084 +35 01 56.86 V T05
2023-07-21 07:26:41 C 11 56 39.756 +35 01 47.39 V T05
2023-07-24 07:04:05 C 11 59 52.001 +34 16 24.60 V T05
2023-07-24 07:08:48 C 11 59 52.171 +34 16 21.61 V T05
2023-07-24 07:14:10 C 11 59 52.418 +34 16 17.54 V T05
2023-07-24 07:24:46 C 11 59 52.867 +34 16 11.46 V T05
2023-07-27 06:09:43 C 12 03 05.750 +33 31 45.37 V T05
2023-07-27 06:19:48 C 12 03 06.250 +33 31 38.03 V T05
2023-07-27 06:24:39 C 12 03 06.449 +33 31 35.15 V T05
2023-07-27 06:39:29 C 12 03 07.138 +33 31 26.22 V T05
2023-12-28 15:29:30 C 15 18 18.014 +06 08 03.08 V T08
2023-12-28 15:31:30 C 15 18 18.096 +06 08 02.83 V T08
2023-12-28 15:37:59 C 15 18 18.418 +06 08 01.36 V T08
2023-12-30 15:33:15 C 15 20 44.926 +05 58 35.90 V T05
2023-12-30 15:39:06 C 15 20 45.194 +05 58 34.54 V T05
2023-12-30 15:50:11 C 15 20 45.778 +05 58 32.66 V T05
2023-12-30 16:02:28 C 15 20 46.414 +05 58 30.07 V T05
2024-01-21 14:23:26 C 15 46 05.038 +04 40 34.18 V T08
2024-01-21 14:27:38 C 15 46 05.220 +04 40 34.03 V T08
2024-01-21 14:53:25 C 15 46 06.377 +04 40 31.30 V T08
2024-01-21 15:05:22 C 15 46 06.876 +04 40 29.96 V T08
2024-01-22 13:26:48 C 15 47 06.804 +04 38 14.35 V T08
2024-01-22 13:35:16 C 15 47 07.162 +04 38 13.38 V T08
2024-01-22 13:40:07 C 15 47 07.392 +04 38 13.20 V T08
2024-01-22 13:54:59 C 15 47 08.066 +04 38 11.80 V T08
2024-01-23 15:28:48 C 15 48 15.886 +04 35 42.97 V T05
2024-01-23 15:34:57 C 15 48 16.164 +04 35 42.11 V T05
2024-01-23 15:49:07 C 15 48 16.769 +04 35 41.03 V T05
2024-01-23 16:03:11 C 15 48 17.390 +04 35 39.77 V T05
2024-01-27 14:52:30 C 15 52 23.818 +04 27 26.53 V T05
2024-01-27 14:56:31 C 15 52 23.974 +04 27 26.17 V T05
2024-01-27 15:06:27 C 15 52 24.382 +04 27 25.56 V T05
2024-01-27 15:22:35 C 15 52 25.061 +04 27 24.08 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)