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
2023-03-14 07:51:17 C 12 35 17.408 +63 20 38.94 V 703
2023-03-14 08:00:11 C 12 35 16.530 +63 20 39.95 V 703
2023-03-14 08:02:57 C 12 35 16.242 +63 20 39.84 V 703
2023-03-14 08:10:53 C 12 35 15.407 +63 20 40.96 V 703
2023-03-14 08:18:57 C 12 35 14.604 +63 20 42.11 V 703
2023-03-14 08:27:21 C 12 35 13.549 +63 20 43.15 V 703
2023-03-16 11:33:27 C 12 30 06.218 +63 25 36.19 V T05
2023-03-16 11:38:03 C 12 30 05.746 +63 25 36.59 V T05
2023-03-16 11:45:55 C 12 30 04.942 +63 25 37.13 V T05
2023-03-16 12:34:47 C 12 29 59.916 +63 25 40.30 V T05
2023-03-20 09:33:57 C 12 20 38.021 +63 27 59.08 V T05
2023-03-20 09:37:12 C 12 20 37.685 +63 27 59.15 V T05
2023-03-20 09:41:46 C 12 20 37.231 +63 27 58.93 V T05
2023-03-20 09:58:05 C 12 20 35.546 +63 27 58.68 V T05
2023-03-22 19:14:13 C 12 14 52.48 +63 25 12.3 V M26
2023-03-22 19:20:21 C 12 14 51.93 +63 25 11.6 V M26
2023-03-22 19:26:28 C 12 14 51.25 +63 25 11.1 V M26
2023-03-24 12:09:47 C 12 10 49.954 +63 21 23.69 V T05
2023-03-24 12:15:21 C 12 10 49.411 +63 21 22.93 V T05
2023-03-24 12:23:28 C 12 10 48.602 +63 21 22.00 V T05
2023-03-24 12:40:40 C 12 10 46.872 +63 21 19.91 V T05
2023-03-28 09:40:47 C 12 01 53.906 +63 06 51.52 V T05
2023-03-28 09:43:23 C 12 01 53.654 +63 06 50.98 V T05
2023-03-28 09:47:18 C 12 01 53.299 +63 06 50.11 V T05
2023-03-28 10:16:44 C 12 01 50.501 +63 06 44.42 V T05
2023-03-28 23:54:34 C 12 00 34.67 +63 03 56.7 17.4 q M54
2023-03-29 01:01:31 C 12 00 28.35 +63 03 42.6 17.2 q M54
2023-03-29 02:03:46 C 12 00 22.52 +63 03 28.9 17.3 q M54
2023-03-30 05:53:29 C 11 57 50.699 +62 57 18.04 V 703
2023-03-30 06:01:52 C 11 57 49.903 +62 57 16.13 V 703
2023-03-30 06:10:36 C 11 57 49.122 +62 57 14.00 V 703
2023-03-30 06:19:23 C 11 57 48.294 +62 57 11.88 V 703
2023-04-02 22:19:05 B 11 50 08.57 +62 33 21.6 V L65
2023-04-02 22:33:17 B 11 50 07.35 +62 33 17.1 V L65
2023-04-02 22:47:29 B 11 50 06.16 +62 33 12.6 V L65
2023-04-03 05:55:11 C 11 49 30.547 +62 31 02.10 V 703
2023-04-03 06:02:56 C 11 49 29.867 +62 30 59.69 V 703
2023-04-03 06:10:42 C 11 49 29.212 +62 30 57.64 V 703
2023-04-03 06:18:28 C 11 49 28.556 +62 30 55.15 V 703
2023-04-03 23:49:35 B 11 48 01.85 +62 25 19.5 V L65
2023-04-03 23:56:47 B 11 48 01.25 +62 25 17.2 V L65
2023-04-04 00:03:59 B 11 48 00.62 +62 25 14.7 V L65
2023-04-05 20:52:02 B 11 44 26.616 +62 09 58.26 X B72
2023-04-05 20:56:41 B 11 44 26.266 +62 09 56.43 X B72
2023-04-05 21:01:20 B 11 44 25.859 +62 09 54.78 X B72
2023-04-10 10:06:27 C 11 36 28.536 +61 27 00.61 V T05
2023-04-10 10:11:16 C 11 36 28.202 +61 26 58.42 V T05
2023-04-10 10:20:04 C 11 36 27.590 +61 26 54.89 V T05
2023-04-10 10:35:24 C 11 36 26.544 +61 26 48.23 V T05
2023-04-11 06:54:59 C 11 35 05.024 +61 17 57.26 V 703
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)