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
2023-04-11 07:02:40 C 11 35 04.524 +61 17 54.02 V 703
2023-04-11 07:10:21 C 11 35 04.009 +61 17 50.57 V 703
2023-04-11 07:18:02 C 11 35 03.509 +61 17 47.11 V 703
2023-04-13 21:16:45 B 11 31 09.64 +60 49 20.2 V L65
2023-04-13 21:23:57 B 11 31 09.18 +60 49 16.4 V L65
2023-04-13 21:31:10 B 11 31 08.76 +60 49 13.3 V L65
2023-04-14 02:53:33 B 11 30 49.60 +60 46 40.1 V H89
2023-04-14 04:26:04 B 11 30 43.92 +60 45 55.3 V H89
2023-04-14 05:33:02 B 11 30 39.83 +60 45 23.1 V H89
2023-04-14 21:04:34 B 11 29 45.56 +60 37 51.4 V L65
2023-04-14 21:11:46 B 11 29 45.16 +60 37 48.3 V L65
2023-04-14 21:18:57 B 11 29 44.74 +60 37 44.7 V L65
2023-04-15 06:38:29 C 11 29 12.556 +60 33 11.02 V 703
2023-04-15 06:46:10 C 11 29 12.109 +60 33 07.16 V 703
2023-04-15 06:53:51 C 11 29 11.645 +60 33 03.42 V 703
2023-04-15 07:01:31 C 11 29 11.188 +60 32 59.53 V 703
2023-04-16 02:34:58 B 11 28 05.95 +60 23 14.2 V H89
2023-04-16 04:04:05 B 11 28 00.73 +60 22 29.2 V H89
2023-04-16 05:35:41 B 11 27 55.73 +60 21 42.0 V H89
2023-04-16 09:17:42 C 11 27 43.800 +60 19 51.92 V T05
2023-04-16 09:21:56 C 11 27 43.555 +60 19 49.87 V T05
2023-04-16 09:29:52 C 11 27 43.104 +60 19 45.77 V T05
2023-04-16 09:44:23 C 11 27 42.298 +60 19 38.53 V T05
2023-04-18 06:20:47 C 11 25 22.933 +59 56 33.04 V 703
2023-04-18 06:29:05 C 11 25 22.508 +59 56 28.43 V 703
2023-04-18 06:37:24 C 11 25 22.066 +59 56 24.29 V 703
2023-04-18 06:45:43 C 11 25 21.623 +59 56 20.04 V 703
2023-04-18 09:04:23 C 11 25 14.796 +59 55 07.18 V T05
2023-04-18 09:08:59 C 11 25 14.614 +59 55 04.73 V T05
2023-04-18 09:16:51 C 11 25 14.158 +59 55 00.55 V T05
2023-04-18 09:33:43 C 11 25 13.332 +59 54 51.52 V T05
2023-04-18 20:35:22 B 11 24 40.94 +59 48 58.2 V L65
2023-04-18 20:41:30 B 11 24 40.70 +59 48 55.0 V L65
2023-04-18 20:45:06 B 11 24 40.50 +59 48 52.8 V L65
2023-04-20 05:22:08 C 11 23 08.383 +59 31 15.20 V G96
2023-04-20 05:30:24 C 11 23 07.991 +59 31 10.70 V G96
2023-04-20 05:38:41 C 11 23 07.580 +59 31 06.24 V G96
2023-04-20 05:46:59 C 11 23 07.199 +59 31 01.60 V G96
2023-04-20 21:21:36 C 11 22 25.43 +59 22 24.9 V M53
2023-04-20 22:27:46 C 11 22 22.44 +59 21 48.2 V M53
2023-04-20 22:54:30 C 11 22 21.24 +59 21 33.1 V M53
2023-04-21 21:45:38 C 11 21 22.66 +59 08 46.1 V M53
2023-04-21 22:10:44 C 11 21 21.59 +59 08 31.8 V M53
2023-04-21 22:43:26 C 11 21 20.15 +59 08 13.4 V M53
2023-04-22 06:18:45 C 11 21 01.278 +59 03 57.13 V 703
2023-04-22 06:26:29 C 11 21 00.990 +59 03 52.85 V 703
2023-04-22 06:34:12 C 11 21 00.630 +59 03 48.38 V 703
2023-04-22 06:41:56 C 11 21 00.270 +59 03 43.27 V 703
2023-04-22 08:55:24 C 11 20 54.977 +59 02 28.97 V T05
2023-04-22 09:00:17 C 11 20 54.768 +59 02 25.76 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)