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
2019-11-09 14:30:59 C 09 05 33.53 +37 50 17.8 V T05
2019-11-09 14:45:25 C 09 05 34.41 +37 50 55.4 V T05
2019-11-09 15:39:47 C 09 05 37.70 +37 53 16.7 V T05
2019-11-11 12:52:25 C 09 08 32.21 +39 50 23.4 V T08
2019-11-11 12:58:17 C 09 08 32.57 +39 50 38.9 V T08
2019-11-11 13:06:30 C 09 08 33.06 +39 51 00.1 V T08
2019-11-11 13:21:52 C 09 08 33.95 +39 51 40.6 V T08
2019-11-13 11:48:35 C 09 11 26.63 +41 51 58.4 V T05
2019-11-13 11:53:33 C 09 11 26.94 +41 52 11.4 V T05
2019-11-13 12:01:51 C 09 11 27.41 +41 52 33.2 V T05
2019-11-13 12:22:00 C 09 11 28.58 +41 53 26.0 V T05
2019-11-15 13:30:30 C 09 14 22.86 +44 00 32.5 V T08
2019-11-15 13:35:22 C 09 14 23.12 +44 00 45.3 V T08
2019-11-15 13:43:31 C 09 14 23.55 +44 01 06.5 V T08
2019-11-15 13:58:20 C 09 14 24.33 +44 01 44.9 V T08
2019-11-15 15:42:32 C 09 14 29.82 +44 06 15.1 V T08
2019-11-17 09:18:16 C 09 16 50.39 +45 53 16.4 u H21
2019-11-17 09:20:47 C 09 16 50.52 +45 53 22.9 u H21
2019-11-17 09:23:19 C 09 16 50.65 +45 53 29.5 u H21
2019-11-17 09:25:50 C 09 16 50.78 +45 53 36.0 u H21
2019-11-17 09:28:21 C 09 16 50.91 +45 53 42.5 u H21
2019-11-17 09:30:52 C 09 16 51.04 +45 53 49.0 u H21
2019-11-17 09:33:23 C 09 16 51.16 +45 53 55.5 u H21
2019-11-17 09:35:55 C 09 16 51.31 +45 54 02.0 u H21
2019-11-17 09:38:26 C 09 16 51.42 +45 54 08.6 u H21
2019-11-17 09:40:57 C 09 16 51.55 +45 54 15.1 u H21
2019-11-17 09:43:28 C 09 16 51.68 +45 54 21.6 u H21
2019-11-17 09:45:59 C 09 16 51.80 +45 54 28.1 u H21
2019-11-17 09:48:31 C 09 16 51.94 +45 54 34.6 u H21
2019-11-17 09:51:02 C 09 16 52.06 +45 54 41.1 u H21
2019-11-17 09:53:33 C 09 16 52.19 +45 54 47.6 u H21
2019-11-17 09:56:04 C 09 16 52.33 +45 54 54.1 u H21
2019-11-17 09:59:21 C 09 16 52.49 +45 55 02.6 u H21
2019-11-17 13:14:54 C 09 17 03.60 +46 03 27.1 V T05
2019-11-17 13:20:11 C 09 17 03.86 +46 03 40.9 V T05
2019-11-17 13:30:02 C 09 17 04.35 +46 04 06.5 V T05
2019-11-17 13:47:10 C 09 17 05.22 +46 04 50.8 V T05
2019-11-27 13:09:22 C 09 27 24.68 +56 03 17.4 V T08
2019-11-27 13:14:07 C 09 27 24.80 +56 03 29.0 V T08
2019-11-27 13:23:09 C 09 27 25.02 +56 03 50.9 V T08
2019-11-27 13:37:23 C 09 27 25.35 +56 04 25.5 V T08
2019-11-29 13:42:36 C 09 28 38.35 +57 58 54.2 V T05
2019-11-29 13:46:42 C 09 28 38.41 +57 59 03.9 V T05
2019-11-29 13:54:09 C 09 28 38.53 +57 59 21.7 V T05
2019-11-29 14:11:23 C 09 28 38.80 +58 00 02.4 V T05
2019-12-02 08:10:17 C 09 29 41.51 +60 32 38.0 V 703
2019-12-02 08:18:04 C 09 29 41.57 +60 32 56.0 V 703
2019-12-02 08:25:54 C 09 29 41.61 +60 33 14.1 V 703
2019-12-02 08:33:41 C 09 29 41.66 +60 33 32.0 V 703
2019-12-05 12:56:04 C 09 29 47.34 +63 23 07.8 V T08
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)