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
2022-11-26 13:35:07 C 12 29 45.360 +41 52 54.91 V T08
2022-11-26 13:39:07 C 12 29 45.658 +41 52 55.81 V T08
2022-11-26 13:40:27 C 12 29 45.744 +41 52 56.06 V T08
2022-11-26 13:57:49 C 12 29 47.038 +41 53 00.38 V T08
2022-11-26 13:58:29 C 12 29 47.069 +41 53 00.78 V T08
2022-11-26 14:02:28 C 12 29 47.369 +41 53 01.72 V T08
2022-11-26 14:07:07 C 12 29 47.707 +41 53 03.01 V T08
2022-11-26 14:12:29 C 12 29 48.098 +41 53 04.34 V T08
2022-11-29 11:17:36 C 12 34 50.977 +42 10 51.71 V 703
2022-11-29 11:24:51 C 12 34 51.506 +42 10 53.40 V 703
2022-11-29 11:32:07 C 12 34 52.000 +42 10 55.42 V 703
2022-11-29 11:39:23 C 12 34 52.532 +42 10 57.54 V 703
2022-12-11 10:49:08 C 12 54 20.891 +43 42 25.92 V 703
2022-12-11 10:57:03 C 12 54 21.503 +43 42 30.17 V 703
2022-12-11 11:04:57 C 12 54 22.007 +43 42 33.12 V 703
2022-12-11 11:10:55 C 12 54 22.385 +43 42 35.57 V G96
2022-12-11 11:12:51 C 12 54 22.504 +43 42 36.00 V 703
2022-12-11 11:18:21 C 12 54 22.849 +43 42 38.38 V G96
2022-12-11 11:25:48 C 12 54 23.317 +43 42 41.22 V G96
2022-12-11 11:33:14 C 12 54 23.778 +43 42 44.06 V G96
2022-12-14 14:13:00 C 12 59 01.495 +44 11 22.31 V T05
2022-12-14 14:36:15 C 12 59 02.904 +44 11 31.60 V T05
2022-12-14 14:41:33 C 12 59 03.185 +44 11 33.90 V T05
2022-12-14 14:51:24 C 12 59 03.806 +44 11 37.86 V T05
2022-12-21 11:48:11 C 13 08 33.760 +45 22 11.28 V 703
2022-12-21 11:55:58 C 13 08 34.177 +45 22 14.84 V 703
2022-12-21 12:03:45 C 13 08 34.588 +45 22 18.55 V 703
2022-12-21 12:11:31 C 13 08 34.991 +45 22 22.12 V 703
2022-12-26 11:21:01 C 13 14 45.557 +46 19 35.08 V 703
2022-12-26 11:28:38 C 13 14 45.895 +46 19 38.93 V 703
2022-12-26 11:36:14 C 13 14 46.252 +46 19 42.92 V 703
2022-12-26 11:43:50 C 13 14 46.640 +46 19 46.67 V 703
2023-01-09 09:00:29 C 13 28 24.611 +49 25 28.20 V 703
2023-01-09 09:08:19 C 13 28 24.852 +49 25 32.95 V 703
2023-01-09 09:16:11 C 13 28 25.100 +49 25 38.03 V 703
2023-01-09 09:24:03 C 13 28 25.338 +49 25 42.60 V 703
2023-01-09 09:47:07 C 13 28 26.044 +49 25 57.00 V G96
2023-01-09 09:55:36 C 13 28 26.306 +49 26 02.33 V G96
2023-01-09 10:04:05 C 13 28 26.569 +49 26 07.55 V G96
2023-01-09 10:12:33 C 13 28 26.828 +49 26 12.80 V G96
2023-01-13 09:42:20 C 13 31 11.640 +50 25 33.02 V 703
2023-01-13 09:50:09 C 13 31 11.820 +50 25 38.10 V 703
2023-01-13 09:57:58 C 13 31 12.047 +50 25 43.18 V 703
2023-01-13 10:05:47 C 13 31 12.220 +50 25 48.22 V 703
2023-01-13 10:12:30 C 13 31 12.454 +50 25 53.00 V 703
2023-01-13 10:20:19 C 13 31 12.601 +50 25 58.04 V 703
2023-01-13 10:28:07 C 13 31 12.763 +50 26 02.22 V 703
2023-01-13 10:35:56 C 13 31 12.950 +50 26 07.62 V 703
2023-01-15 13:15:34 C 13 32 25.850 +50 58 32.09 V T05
2023-01-15 13:18:10 C 13 32 25.894 +50 58 33.89 V T05
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)