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
2024-07-10 04:30:19 C 13 41 44.11 -11 39 10.0 q 463
2024-07-11 03:54:07 C 13 41 12.65 -11 59 09.7 q 463
2024-07-11 04:05:05 C 13 41 12.33 -11 59 17.7 q 463
2024-07-11 06:01:53 C 13 41 09.902 -12 00 56.27 V T08
2024-07-11 06:06:33 C 13 41 09.792 -12 01 00.41 V T08
2024-07-11 06:15:24 C 13 41 09.578 -12 01 07.90 V T08
2024-07-11 06:38:32 C 13 41 09.036 -12 01 27.66 V T08
2024-07-12 02:10:44 C 13 40 44.80 -12 18 12.0 W30
2024-07-12 02:27:48 C 13 40 44.43 -12 18 26.8 W30
2024-07-12 02:43:29 C 13 40 44.14 -12 18 40.5 W30
2024-07-18 01:44:04 C 13 38 38.698 -14 21 36.14 V W68
2024-07-18 01:48:40 C 13 38 38.676 -14 21 40.07 V W68
2024-07-18 01:56:42 C 13 38 38.554 -14 21 47.12 V W68
2024-07-18 02:11:26 C 13 38 38.424 -14 21 59.76 V W68
2024-07-18 18:46:53 B 13 38 29.703 -14 36 22.11 Z M49
2024-07-18 18:52:01 B 13 38 29.677 -14 36 26.43 Z M49
2024-07-18 18:57:08 B 13 38 29.606 -14 36 30.63 Z M49
2024-07-21 09:21:45 B 13 38 06.52 -15 30 37.4 q Q73
2024-07-21 09:40:01 B 13 38 06.41 -15 30 53.2 q Q73
2024-07-21 09:57:08 B 13 38 06.31 -15 31 08.2 q Q73
2024-07-23 01:13:42 C 13 37 59.772 -16 05 19.39 V W68
2024-07-23 01:19:00 C 13 37 59.765 -16 05 23.96 V W68
2024-07-23 01:50:09 C 13 37 59.671 -16 05 50.86 V W68
2024-07-23 02:00:14 C 13 37 59.662 -16 05 59.75 V W68
2024-07-23 23:25:43 B 13 37 58.77 -16 24 42.3 Z X86
2024-07-23 23:37:47 B 13 37 58.75 -16 24 52.6 Z X86
2024-07-23 23:45:50 B 13 37 58.74 -16 24 59.5 Z X86
2024-07-24 20:11:48 C 13 37 59.462 -16 42 49.28 V M22
2024-07-24 20:16:31 C 13 37 59.465 -16 42 53.50 V M22
2024-07-24 20:23:53 C 13 37 59.465 -16 42 59.87 V M22
2024-07-24 20:46:09 C 13 37 59.482 -16 43 19.16 V M22
2024-07-27 01:10:59 C 13 38 08.899 -17 29 15.54 V W68
2024-07-27 01:15:38 C 13 38 08.916 -17 29 19.68 V W68
2024-07-27 01:24:27 C 13 38 08.945 -17 29 27.31 V W68
2024-07-27 01:39:13 C 13 38 09.002 -17 29 40.20 V W68
2024-07-27 02:01:33 C 13 38 09.08 -17 29 59.5 Z X07
2024-07-27 02:22:03 C 13 38 09.16 -17 30 17.5 Z X07
2024-07-27 02:41:34 C 13 38 09.24 -17 30 34.9 Z X07
2024-07-28 09:35:19 B 13 38 19.87 -17 57 45.4 q Q73
2024-07-28 09:40:52 B 13 38 19.91 -17 57 50.2 q Q73
2024-07-28 09:46:36 B 13 38 19.93 -17 57 55.4 q Q73
2024-07-30 00:40:33 C 13 38 38.081 -18 32 14.64 V W68
2024-07-30 00:45:11 C 13 38 38.107 -18 32 18.67 V W68
2024-07-30 00:53:48 C 13 38 38.182 -18 32 26.30 V W68
2024-07-30 01:22:21 C 13 38 38.393 -18 32 51.40 V W68
2024-07-31 18:50:30 C 13 39 03.907 -19 09 34.96 V M22
2024-07-31 18:56:24 C 13 39 03.958 -19 09 40.10 V M22
2024-07-31 19:23:00 C 13 39 04.250 -19 10 03.58 V M22
2024-08-01 18:36:06 C 13 39 21.254 -19 30 42.01 V M22
2024-08-01 18:49:35 C 13 39 21.432 -19 30 53.71 V M22
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)