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
2024-12-28 18:05:29 B 23 43 43.531 -10 41 06.40 V 160
2024-12-28 18:09:48 B 23 43 44.201 -10 40 49.87 V 160
2024-12-28 18:14:03 B 23 43 44.856 -10 40 33.60 V 160
2024-12-29 16:43:00 B 23 47 13.423 -09 15 20.16 V 160
2024-12-29 16:47:15 B 23 47 14.062 -09 15 04.25 V 160
2024-12-29 16:51:29 B 23 47 14.688 -09 14 48.26 V 160
2024-12-30 04:58:34 C 23 49 05.112 -08 29 15.43 V T08
2024-12-30 05:06:29 C 23 49 06.269 -08 28 45.73 V T08
2024-12-30 05:11:07 C 23 49 06.960 -08 28 28.38 V T08
2024-12-30 05:32:26 C 23 49 10.126 -08 27 08.68 V T08
2024-12-31 02:53:50 C 23 52 22.332 -07 07 52.68 V 703
2024-12-31 02:57:10 C 23 52 22.822 -07 07 40.37 V 703
2024-12-31 03:00:31 C 23 52 23.308 -07 07 28.24 V 703
2024-12-31 03:03:51 C 23 52 23.794 -07 07 15.74 V 703
2025-01-01 04:52:14 C 23 56 11.861 -05 32 53.81 V T05
2025-01-01 04:56:47 C 23 56 12.514 -05 32 37.36 V T05
2025-01-01 05:04:37 C 23 56 13.630 -05 32 08.92 V T05
2025-01-01 05:32:12 C 23 56 17.563 -05 30 28.91 V T05
2025-01-02 02:42:11 C 23 59 21.059 -04 14 27.67 V 703
2025-01-02 02:45:31 C 23 59 21.527 -04 14 15.47 V 703
2025-01-02 02:48:51 C 23 59 21.998 -04 14 03.77 V 703
2025-01-02 02:52:11 C 23 59 22.463 -04 13 51.89 V 703
2025-01-03 05:00:22 C 00 03 05.186 -02 41 35.45 V T08
2025-01-03 05:04:59 C 00 03 05.832 -02 41 19.36 V T08
2025-01-03 05:12:55 C 00 03 06.914 -02 40 51.71 V T08
2025-01-03 05:36:06 C 00 03 10.104 -02 39 30.67 V T08
2025-01-04 18:23:59 B 00 08 16.675 -00 33 02.52 V 160
2025-01-04 18:27:54 B 00 08 17.210 -00 32 49.16 V 160
2025-01-04 18:31:44 B 00 08 17.731 -00 32 36.17 V 160
2025-01-05 02:10:56 B 00 09 20.35 -00 06 44.1 q V75
2025-01-05 02:27:21 B 00 09 22.56 -00 05 49.0 q V75
2025-01-05 02:44:48 B 00 09 24.90 -00 04 50.3 q V75
2025-01-07 00:47:07 B 00 15 36.42 +02 26 46.2 q V75
2025-01-07 01:09:14 B 00 15 39.28 +02 27 57.3 q V75
2025-01-07 01:29:52 B 00 15 41.96 +02 29 03.8 q V75
2025-01-07 05:12:31 C 00 16 11.453 +02 41 01.57 V T08
2025-01-07 05:17:08 C 00 16 12.053 +02 41 16.30 V T08
2025-01-07 05:36:59 C 00 16 14.621 +02 42 20.05 V T08
2025-01-07 05:52:17 C 00 16 16.603 +02 43 09.08 V T08
2025-01-09 05:44:54 C 00 22 31.020 +05 13 17.98 V T05
2025-01-09 05:50:13 C 00 22 31.690 +05 13 34.25 V T05
2025-01-09 06:00:42 C 00 22 33.010 +05 14 06.29 V T05
2025-01-09 18:18:35 C 00 24 07.829 +05 51 27.65 Z C23
2025-01-09 18:23:05 C 00 24 08.402 +05 51 41.47 Z C23
2025-01-09 18:35:06 C 00 24 09.910 +05 52 17.54 Z C23
2025-01-10 17:17:56 C 00 27 03.175 +07 00 12.60 Z C23
2025-01-10 17:53:27 C 00 27 07.598 +07 01 57.61 Z C23
2025-01-10 18:20:55 C 00 27 11.018 +07 03 18.83 Z C23
2025-01-11 23:10:45 C 00 30 47.91 +08 27 12.9 q W44
2025-01-11 23:23:26 C 00 30 49.41 +08 27 47.9 q W44
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)