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
2024-09-11 23:56:50 C 14 18 17.306 -35 16 44.76 V W68
2024-09-12 23:27:36 C 14 19 52.135 -35 41 17.05 V W68
2024-09-12 23:32:11 C 14 19 52.440 -35 41 21.84 V W68
2024-09-12 23:41:24 C 14 19 53.047 -35 41 31.45 V W68
2024-09-12 23:56:08 C 14 19 54.046 -35 41 46.61 V W68
2024-09-16 23:33:43 C 14 26 42.096 -37 22 40.58 V W68
2024-09-16 23:38:17 C 14 26 42.422 -37 22 45.48 V W68
2024-09-16 23:48:54 C 14 26 43.198 -37 22 56.64 V W68
2024-09-17 00:03:40 C 14 26 44.292 -37 23 12.01 V W68
2024-09-20 00:17:18 C 14 32 17.856 -38 40 33.67 V W68
2024-09-20 00:21:25 C 14 32 18.175 -38 40 38.10 V W68
2024-09-20 00:28:50 C 14 32 18.768 -38 40 45.98 V W68
2024-09-20 00:59:06 C 14 32 21.175 -38 41 18.20 V W68
2024-09-22 23:43:03 C 14 38 11.148 -39 58 01.31 V W68
2024-09-22 23:55:39 C 14 38 12.211 -39 58 14.81 V W68
2024-09-23 00:24:59 C 14 38 14.714 -39 58 46.34 V W68
2024-09-25 21:37:51 C 14 44 21.42 -41 14 40.6 q Y16
2024-09-25 21:43:57 C 14 44 22.04 -41 14 47.5 q Y16
2024-09-25 21:50:44 C 14 44 22.75 -41 14 55.3 q Y16
2024-12-11 19:23:36 C 22 24 37.207 -37 06 22.14 V M22
2024-12-11 19:28:13 C 22 24 38.333 -37 06 05.33 V M22
2024-12-11 19:36:14 C 22 24 40.284 -37 05 36.17 V M22
2024-12-11 20:05:09 C 22 24 47.309 -37 03 51.19 V M22
2024-12-13 01:18:33 C 22 31 48.732 -35 17 03.98 V W68
2024-12-13 01:23:09 C 22 31 49.805 -35 16 46.85 V W68
2024-12-13 01:31:39 C 22 31 51.790 -35 16 15.38 V W68
2024-12-13 02:02:43 C 22 31 59.059 -35 14 19.64 V W68
2024-12-14 01:16:22 C 22 37 22.882 -33 47 35.05 V W68
2024-12-14 01:24:17 C 22 37 24.679 -33 47 05.03 V W68
2024-12-14 01:41:57 C 22 37 28.678 -33 45 58.10 V W68
2024-12-14 18:54:36 C 22 41 22.567 -32 40 45.19 V M22
2024-12-14 18:59:11 C 22 41 23.582 -32 40 27.59 V M22
2024-12-14 19:07:03 C 22 41 25.322 -32 39 57.46 V M22
2024-12-14 19:22:06 C 22 41 28.663 -32 38 59.71 V M22
2024-12-17 01:08:23 C 22 53 07.553 -29 10 59.12 V W68
2024-12-17 01:13:05 C 22 53 08.527 -29 10 40.66 V W68
2024-12-17 01:21:16 C 22 53 10.234 -29 10 08.18 V W68
2024-12-17 01:36:02 C 22 53 13.296 -29 09 10.40 V W68
2024-12-18 01:09:39 C 22 58 05.374 -27 36 26.64 V W68
2024-12-18 01:22:20 C 22 58 07.927 -27 35 36.28 V W68
2024-12-18 01:39:28 C 22 58 11.371 -27 34 28.45 V W68
2024-12-18 19:09:19 C 23 01 42.979 -26 25 09.30 V M22
2024-12-18 19:13:55 C 23 01 43.882 -26 24 51.08 V M22
2024-12-18 19:21:52 C 23 01 45.449 -26 24 19.33 V M22
2024-12-18 19:36:15 C 23 01 48.286 -26 23 21.98 V M22
2024-12-19 18:48:56 C 23 06 22.294 -24 50 58.31 V M22
2024-12-19 18:53:33 C 23 06 23.186 -24 50 39.70 V M22
2024-12-19 19:03:20 C 23 06 25.054 -24 50 00.64 V M22
2024-12-19 19:19:01 C 23 06 28.070 -24 48 57.78 V M22
2024-12-20 11:30:09 B 23 09 34.60 -23 44 18.6 q Q73
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)