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
2024-05-09 04:23:36 C 15 32 42.581 +04 42 39.02 V W68
2024-05-09 04:24:15 C 15 32 42.494 +04 42 38.84 V W68
2024-05-09 04:32:45 C 15 32 41.729 +04 42 36.22 V W68
2024-05-09 13:02:28 C 15 31 56.22 +04 40 17.3 t P68
2024-05-09 13:59:00 C 15 31 51.04 +04 40 02.7 t P68
2024-05-09 14:53:10 C 15 31 46.08 +04 39 48.7 t P68
2024-05-09 15:43:29 C 15 31 41.47 +04 39 35.6 t P68
2024-05-09 20:43:54 C 15 31 14.630 +04 38 15.40 Z C23
2024-05-09 21:28:20 C 15 31 10.625 +04 38 04.78 V M52
2024-05-09 21:58:07 C 15 31 07.855 +04 37 55.88 Z C23
2024-05-09 22:14:11 C 15 31 06.394 +04 37 52.32 V M52
2024-05-09 22:14:45 B 15 31 06.348 +04 37 51.45 X B72
2024-05-09 22:19:53 B 15 31 05.878 +04 37 50.07 X B72
2024-05-09 22:25:01 B 15 31 05.409 +04 37 48.72 X B72
2024-05-10 08:51:47 C 15 30 08.323 +04 35 02.29 V 703
2024-05-10 08:55:08 C 15 30 08.017 +04 35 01.28 V 703
2024-05-10 08:58:28 C 15 30 07.715 +04 35 00.31 V 703
2024-05-10 09:01:49 C 15 30 07.398 +04 34 59.45 V 703
2024-05-10 18:58:49 C 15 29 12.991 +04 32 13.82 O18
2024-05-10 20:34:33 C 15 29 04.074 +04 31 46.90 O18
2024-05-10 21:07:42 B 15 29 01.543 +04 31 37.42 V 160
2024-05-10 21:11:32 B 15 29 01.150 +04 31 36.19 V 160
2024-05-10 21:15:23 B 15 29 00.751 +04 31 34.97 V 160
2024-05-10 21:24:40 C 15 28 59.93 +04 31 31.7 V D48
2024-05-10 21:42:16 C 15 28 58.30 +04 31 26.8 V D48
2024-05-10 21:59:53 C 15 28 56.67 +04 31 21.9 V D48
2024-05-10 22:03:29 C 15 28 56.335 +04 31 20.71 Z C23
2024-05-10 22:14:38 C 15 28 55.289 +04 31 18.95 V M52
2024-05-10 23:02:59 C 15 28 50.791 +04 31 05.20 V M52
2024-05-10 23:48:03 C 15 28 46.567 +04 30 51.19 Z C23
2024-05-11 19:53:15 C 15 26 55.766 +04 25 02.39 V M52
2024-05-11 21:01:27 C 15 26 49.334 +04 24 42.41 V M52
2024-05-11 21:07:29 B 15 26 48.766 +04 24 39.92 V 160
2024-05-11 21:12:25 B 15 26 48.295 +04 24 38.48 V 160
2024-05-11 21:17:09 B 15 26 47.844 +04 24 37.08 V 160
2024-05-11 22:06:34 C 15 26 43.048 +04 24 21.89 V 089
2024-05-11 22:08:56 C 15 26 42.835 +04 24 21.16 V 089
2024-05-11 22:53:03 B 15 26 38.806 +04 24 07.49 V L65
2024-05-11 22:57:11 B 15 26 38.419 +04 24 06.19 V L65
2024-05-11 23:01:18 B 15 26 38.028 +04 24 05.04 V L65
2024-05-12 10:12:14 C 15 25 35.188 +04 20 43.51 V 703
2024-05-12 10:15:34 C 15 25 34.878 +04 20 42.76 V 703
2024-05-12 10:18:53 C 15 25 34.547 +04 20 41.35 V 703
2024-05-12 10:22:13 C 15 25 34.226 +04 20 40.63 V 703
2024-05-13 13:49:37 C 15 22 59.85 +04 11 56.4 t P68
2024-05-13 14:15:03 C 15 22 57.38 +04 11 47.7 t P68
2024-05-13 14:44:50 C 15 22 54.51 +04 11 38.4 t P68
2024-05-13 20:40:30 C 15 22 20.981 +04 09 38.63 Z C23
2024-05-13 20:44:57 C 15 22 20.563 +04 09 37.08 Z C23
2024-05-13 20:49:25 C 15 22 20.136 +04 09 35.71 Z C23
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)