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
2024-06-27 06:57:48 C 13 52 52.685 -07 18 22.39 V T05
2024-06-27 07:02:21 C 13 52 52.450 -07 18 26.14 V T05
2024-06-27 07:26:33 C 13 52 51.218 -07 18 46.08 V T05
2024-06-27 19:55:49 C 13 52 14.952 -07 29 00.35 V M22
2024-06-27 20:00:27 C 13 52 14.717 -07 29 04.13 V M22
2024-06-27 20:09:47 C 13 52 14.256 -07 29 11.83 V M22
2024-06-27 20:10:39 C 13 52 14.30 -07 29 21.8 X K83
2024-06-27 20:11:44 C 13 52 14.25 -07 29 22.9 X K83
2024-06-27 20:16:05 C 13 52 14.03 -07 29 26.6 X K83
2024-06-27 20:28:09 C 13 52 13.344 -07 29 27.10 V M22
2024-06-28 01:20:36 S 13 51 59.59 -07 33 33.0 L C51
2024-06-28 04:24:42 S 13 51 50.88 -07 36 06.1 L C51
2024-06-28 07:28:37 S 13 51 42.24 -07 38 38.7 L C51
2024-06-28 09:00:40 S 13 51 37.93 -07 39 55.3 L C51
2024-06-28 10:32:32 S 13 51 33.64 -07 41 11.8 L C51
2024-06-28 10:32:43 S 13 51 33.63 -07 41 12.1 L C51
2024-06-28 12:04:01 S 13 51 29.37 -07 42 27.3 L C51
2024-06-28 13:35:54 S 13 51 25.10 -07 43 43.8 L C51
2024-06-28 15:08:40 S 13 51 20.82 -07 45 01.4 L C51
2024-06-28 20:44:35 B 13 51 05.156 -07 49 47.57 V L92
2024-06-28 20:50:38 B 13 51 04.997 -07 49 51.81 V L92
2024-06-28 20:58:43 B 13 51 04.597 -07 49 58.24 V L92
2024-06-28 21:16:42 S 13 51 03.92 -07 50 07.8 L C51
2024-06-28 21:19:54 B 13 51 03.648 -07 50 15.83 V 160
2024-06-28 21:25:04 B 13 51 03.394 -07 50 20.94 V 160
2024-06-28 21:36:58 C 13 51 02.933 -07 50 30.44 Z C23
2024-06-28 21:39:10 C 13 51 02.784 -07 50 32.60 Z C23
2024-06-28 21:41:37 C 13 51 02.678 -07 50 35.70 Z C23
2024-06-29 19:58:50 C 13 50 02.97 -08 09 10.2 X G02
2024-06-29 20:06:06 C 13 50 02.61 -08 09 15.9 X G02
2024-06-29 20:13:20 C 13 50 02.29 -08 09 22.0 X G02
2024-06-30 01:11:46 C 13 49 49.320 -08 13 21.47 V W68
2024-06-30 01:16:19 C 13 49 49.116 -08 13 25.18 V W68
2024-06-30 01:34:03 C 13 49 48.312 -08 13 40.08 V W68
2024-06-30 21:23:41 B 13 48 57.732 -08 30 24.19 V 160
2024-06-30 21:28:22 B 13 48 57.521 -08 30 27.90 V 160
2024-06-30 21:33:04 B 13 48 57.353 -08 30 31.57 V 160
2024-07-01 18:57:28 C 13 48 05.203 -08 48 19.37 V M22
2024-07-01 19:06:46 C 13 48 04.822 -08 48 27.14 V M22
2024-07-01 19:20:52 C 13 48 04.236 -08 48 39.02 V M22
2024-07-02 22:25:09 B 13 47 01.67 -09 11 24.3 Z X86
2024-07-02 22:28:11 B 13 47 01.56 -09 11 26.8 Z X86
2024-07-02 22:31:14 B 13 47 01.43 -09 11 29.3 Z X86
2024-07-03 06:11:10 C 13 46 44.239 -09 18 03.13 V T08
2024-07-03 06:17:20 C 13 46 44.004 -09 18 08.24 V T08
2024-07-03 06:28:08 C 13 46 43.582 -09 18 17.32 V T08
2024-07-03 06:48:09 C 13 46 42.799 -09 18 34.20 V T08
2024-07-04 01:17:36 C 13 46 02.830 -09 34 02.96 V W68
2024-07-04 01:23:29 C 13 46 02.614 -09 34 07.90 V W68
2024-07-04 01:33:27 C 13 46 02.237 -09 34 16.25 V W68
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)