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
2026-02-12 08:40:29 B 14 38 57.800 +36 07 03.86 W V47
2026-02-12 08:45:32 B 14 38 57.809 +36 07 06.36 W V47
2026-02-12 08:50:34 B 14 38 57.816 +36 07 08.58 W V47
2026-02-17 14:19:32 C 14 38 37.942 +37 09 14.90 V T05
2026-02-17 14:34:32 C 14 38 37.838 +37 09 22.61 V T05
2026-02-17 14:51:14 C 14 38 37.702 +37 09 30.92 V T05
2026-02-17 14:59:37 C 14 38 37.649 +37 09 35.28 V T05
2026-02-18 13:42:16 C 14 38 28.186 +37 21 01.55 V T08
2026-02-18 13:46:16 C 14 38 28.140 +37 21 03.49 V T08
2026-02-18 13:50:12 C 14 38 28.128 +37 21 05.76 V T08
2026-02-18 14:04:25 C 14 38 27.998 +37 21 12.89 V T08
2026-02-19 13:52:57 C 14 38 15.984 +37 33 15.88 V T08
2026-02-19 13:55:35 C 14 38 15.958 +37 33 16.60 V T08
2026-02-19 14:21:26 C 14 38 15.684 +37 33 29.92 V T08
2026-02-19 14:48:15 C 14 38 15.413 +37 33 43.52 V T08
2026-02-25 09:32:06 C 14 36 23.311 +38 44 23.82 Z U76
2026-02-25 10:13:39 C 14 36 22.524 +38 44 45.20 Z U76
2026-02-25 10:54:24 C 14 36 21.763 +38 45 06.12 Z U76
2026-02-25 13:09:31 C 14 36 19.339 +38 46 16.18 V T08
2026-02-25 13:12:08 C 14 36 19.315 +38 46 17.72 V T08
2026-02-25 13:18:28 C 14 36 19.181 +38 46 20.60 V T08
2026-02-25 13:41:40 C 14 36 18.734 +38 46 32.52 V T08
2026-02-26 11:55:56 C 14 35 53.743 +38 57 52.42 V T08
2026-02-26 12:10:23 C 14 35 53.441 +38 58 00.12 V T08
2026-02-26 12:13:01 C 14 35 53.402 +38 58 01.42 V T08
2026-02-26 12:19:37 C 14 35 53.256 +38 58 04.48 V T08
2026-02-27 09:26:51 C 14 35 27.586 +39 08 48.66 V G96
2026-02-27 09:29:32 C 14 35 27.532 +39 08 50.17 V G96
2026-02-27 09:34:13 C 14 35 27.424 +39 08 52.51 V G96
2026-02-27 09:36:54 C 14 35 27.362 +39 08 53.95 V G96
2026-02-27 09:41:36 C 14 35 27.272 +39 08 56.22 V G96
2026-02-27 09:44:16 C 14 35 27.204 +39 08 57.73 V G96
2026-02-27 09:48:58 C 14 35 27.100 +39 09 00.00 V G96
2026-02-27 09:51:39 C 14 35 27.042 +39 09 01.40 V G96
2026-02-27 11:09:25 C 14 35 25.303 +39 09 41.04 Z U92
2026-02-27 11:14:09 C 14 35 25.200 +39 09 43.42 Z U92
2026-02-27 11:18:55 C 14 35 25.097 +39 09 45.72 Z U92
2026-02-27 11:23:40 C 14 35 24.986 +39 09 48.17 Z U92
2026-02-27 12:14:00 C 14 35 24.096 +39 10 14.56 V T08
2026-02-27 12:18:03 C 14 35 24.017 +39 10 16.68 V T08
2026-02-27 12:27:21 C 14 35 23.818 +39 10 21.22 V T08
2026-02-27 12:39:14 C 14 35 23.544 +39 10 27.41 V T08
2026-03-01 11:26:42 C 14 34 19.853 +39 34 08.58 Z U92
2026-03-01 11:29:53 C 14 34 19.783 +39 34 10.31 Z U92
2026-03-01 11:33:02 C 14 34 19.697 +39 34 11.78 Z U92
2026-03-03 23:02:51 B 14 32 46.786 +40 04 00.12 Z 185
2026-03-03 23:25:44 B 14 32 46.133 +40 04 11.71 Z 185
2026-03-03 23:48:17 B 14 32 45.482 +40 04 23.09 Z 185
2026-03-04 12:40:55 C 14 32 23.381 +40 10 49.40 V T08
2026-03-04 12:44:53 C 14 32 23.273 +40 10 51.24 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)