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
2024-08-01 19:04:14 C 13 39 21.595 -19 31 06.74 V M22
2024-08-05 18:59:45 C 13 40 51.610 -20 56 55.25 V M22
2024-08-05 19:04:22 C 13 40 51.694 -20 56 59.32 V M22
2024-08-05 19:12:16 C 13 40 51.830 -20 57 06.37 V M22
2024-08-05 19:26:55 C 13 40 52.092 -20 57 19.51 V M22
2024-08-06 09:08:21 B 13 41 07.62 -21 09 39.4 q Q73
2024-08-06 09:16:24 B 13 41 07.76 -21 09 46.6 q Q73
2024-08-06 09:24:24 B 13 41 07.90 -21 09 53.7 q Q73
2024-08-10 23:12:23 C 13 43 33.914 -22 49 31.04 V W68
2024-08-10 23:16:56 C 13 43 34.020 -22 49 35.15 V W68
2024-08-10 23:24:49 C 13 43 34.205 -22 49 42.28 V W68
2024-08-10 23:54:46 C 13 43 34.920 -22 50 09.56 V W68
2024-08-11 23:12:27 C 13 44 10.978 -23 11 28.86 V W68
2024-08-11 23:23:45 C 13 44 11.258 -23 11 39.12 V W68
2024-08-11 23:51:45 C 13 44 11.962 -23 12 04.64 V W68
2024-08-11 23:57:53 C 13 44 12.120 -23 12 10.15 V W68
2024-08-12 18:11:08 C 13 44 41.496 -23 28 53.47 V M22
2024-08-12 18:16:22 C 13 44 41.630 -23 28 58.37 V M22
2024-08-12 18:24:56 C 13 44 41.863 -23 29 05.68 V M22
2024-08-12 18:39:32 C 13 44 42.274 -23 29 19.21 V M22
2024-08-15 00:38:41 C 13 46 15.533 -24 19 07.54 V W68
2024-08-15 00:42:40 C 13 46 15.660 -24 19 11.06 V W68
2024-08-15 00:50:33 C 13 46 15.883 -24 19 18.34 V W68
2024-08-15 01:05:48 C 13 46 16.330 -24 19 32.30 V W68
2024-08-16 18:13:03 C 13 47 33.545 -24 57 44.46 V M22
2024-08-16 18:17:35 C 13 47 33.684 -24 57 48.60 V M22
2024-08-16 18:26:46 C 13 47 33.977 -24 57 57.10 V M22
2024-08-16 18:42:35 C 13 47 34.474 -24 58 11.68 V M22
2024-08-17 17:19:59 C 13 48 19.260 -25 19 18.98 V M22
2024-08-17 17:27:51 C 13 48 19.507 -25 19 26.29 V M22
2024-08-17 17:32:24 C 13 48 19.658 -25 19 30.47 V M22
2024-08-17 17:50:14 C 13 48 20.230 -25 19 47.06 V M22
2024-09-01 00:07:34 C 14 02 48.646 -30 48 49.75 V W68
2024-09-01 00:33:19 C 14 02 49.946 -30 49 14.84 V W68
2024-09-01 00:38:37 C 14 02 50.208 -30 49 20.10 V W68
2024-09-01 00:47:15 C 14 02 50.640 -30 49 28.52 V W68
2024-09-01 17:27:58 C 14 03 42.475 -31 06 01.94 V M22
2024-09-01 17:33:10 C 14 03 42.749 -31 06 07.02 V M22
2024-09-01 17:40:57 C 14 03 43.145 -31 06 14.72 V M22
2024-09-01 17:55:55 C 14 03 43.906 -31 06 29.38 V M22
2024-09-02 18:27:22 C 14 05 01.694 -31 30 54.47 V M22
2024-09-02 18:39:42 C 14 05 02.323 -31 31 06.74 V M22
2024-09-02 18:56:36 C 14 05 03.240 -31 31 23.45 V M22
2024-09-04 23:27:57 C 14 07 56.726 -32 24 06.48 V W68
2024-09-04 23:32:32 C 14 07 56.983 -32 24 10.94 V W68
2024-09-04 23:43:09 C 14 07 57.571 -32 24 21.64 V W68
2024-09-04 23:57:58 C 14 07 58.394 -32 24 36.47 V W68
2024-09-11 23:27:04 C 14 18 15.353 -35 16 13.91 V W68
2024-09-11 23:31:38 C 14 18 15.643 -35 16 18.77 V W68
2024-09-11 23:32:57 C 14 18 15.732 -35 16 20.10 V W68
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)