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
2016-06-28 02:42:12 C 13 33 57.79 +10 15 28.9 q H21
2016-06-28 02:44:54 C 13 33 57.75 +10 15 26.9 q H21
2016-06-28 02:47:36 C 13 33 57.71 +10 15 24.7 q H21
2016-06-29 02:23:45 C 13 33 37.59 +09 57 26.9 q H21
2016-06-29 02:26:37 C 13 33 37.56 +09 57 24.8 q H21
2016-06-29 02:29:30 C 13 33 37.52 +09 57 22.5 q H21
2016-06-29 02:32:21 C 13 33 37.49 +09 57 20.4 q H21
2016-06-29 02:35:13 C 13 33 37.44 +09 57 18.3 q H21
2016-06-29 02:38:05 C 13 33 37.40 +09 57 16.1 q H21
2016-06-29 02:40:57 C 13 33 37.35 +09 57 13.9 q H21
2016-06-30 02:29:05 C 13 33 19.04 +09 39 02.7 q H21
2016-06-30 02:32:48 C 13 33 18.99 +09 38 59.6 q H21
2016-06-30 02:36:32 C 13 33 18.94 +09 38 56.8 q H21
2016-06-30 02:40:15 C 13 33 18.89 +09 38 54.1 q H21
2016-06-30 02:44:00 C 13 33 18.84 +09 38 51.2 q H21
2016-06-30 02:47:43 C 13 33 18.80 +09 38 48.4 q H21
2016-06-30 02:51:39 C 13 33 18.75 +09 38 45.3 q H21
2016-07-01 07:07:07 C 13 32 59.56 +09 17 06.5 L T05
2016-07-01 07:26:33 C 13 32 59.32 +09 16 51.3 L T05
2016-07-01 08:03:57 C 13 32 58.89 +09 16 22.5 L T05
2016-07-01 08:23:40 C 13 32 58.67 +09 16 07.2 L T05
2016-07-02 02:27:36 C 13 32 47.97 +09 02 11.7 q H21
2016-07-02 02:30:55 C 13 32 47.94 +09 02 09.5 q H21
2016-07-02 02:34:14 C 13 32 47.89 +09 02 06.7 q H21
2016-07-02 02:37:33 C 13 32 47.88 +09 02 04.4 q H21
2016-07-02 02:40:51 C 13 32 47.84 +09 02 01.7 q H21
2016-07-02 02:44:09 C 13 32 47.79 +09 01 58.9 q H21
2016-07-02 02:47:16 C 13 32 47.77 +09 01 57.0 q H21
2016-07-03 03:11:00 C 13 32 34.99 +08 43 07.4 q H45
2016-07-03 03:13:52 C 13 32 34.96 +08 43 05.2 q H45
2016-07-03 03:15:26 C 13 32 34.95 +08 43 03.9 q H45
2016-07-03 03:16:56 C 13 32 34.94 +08 43 02.8 q H45
2016-07-03 03:18:20 C 13 32 34.93 +08 43 01.7 q H45
2016-07-03 03:19:46 C 13 32 34.91 +08 43 00.6 q H45
2016-07-03 03:41:53 C 13 32 34.77 +08 42 44.1 q 719
2016-07-03 04:14:30 C 13 32 34.54 +08 42 21.5 q 719
2016-07-04 03:33:31 C 13 32 24.21 +08 24 16.0 v 719
2016-07-04 04:24:04 C 13 32 23.84 +08 23 36.4 v 719
2016-07-05 04:54:59 C 13 32 14.99 +08 04 35.3 q 703
2016-07-05 04:57:53 C 13 32 14.88 +08 04 31.8 q 703
2016-07-05 06:57:19 C 13 32 14.39 +08 03 01.3 L T05
2016-07-05 07:16:24 C 13 32 14.25 +08 02 46.6 L T05
2016-07-05 07:35:00 C 13 32 14.15 +08 02 31.8 L T05
2016-07-05 07:53:04 C 13 32 14.04 +08 02 18.0 L T05
2016-07-06 02:17:48 C 13 32 08.94 +07 47 57.1 u H21
2016-07-06 02:20:19 C 13 32 08.91 +07 47 55.3 u H21
2016-07-06 02:22:50 C 13 32 08.91 +07 47 53.2 u H21
2016-07-06 02:25:21 C 13 32 08.90 +07 47 51.3 u H21
2016-07-06 02:27:52 C 13 32 08.88 +07 47 49.3 u H21
2016-07-06 02:30:23 C 13 32 08.86 +07 47 47.4 u H21
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)