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
2024-01-30 08:27:47 C 15 55 08.923 +04 22 41.34 V W68
2024-01-30 08:42:03 C 15 55 09.490 +04 22 39.86 V W68
2024-01-30 09:02:00 C 15 55 10.310 +04 22 38.93 V W68
2024-01-30 09:10:42 C 15 55 10.673 +04 22 38.57 V W68
2024-01-31 15:01:47 C 15 56 24.269 +04 20 39.52 V T05
2024-01-31 15:16:21 C 15 56 24.854 +04 20 38.62 V T05
2024-01-31 15:21:42 C 15 56 25.061 +04 20 38.44 V T05
2024-01-31 15:38:00 C 15 56 25.718 +04 20 37.32 V T05
2024-02-02 15:00:42 C 15 58 20.429 +04 17 51.47 V T08
2024-02-02 15:01:22 C 15 58 20.458 +04 17 51.50 V T08
2024-02-02 15:07:06 C 15 58 20.683 +04 17 51.18 V T08
2024-02-02 15:09:51 C 15 58 20.803 +04 17 51.04 V T08
2024-02-02 15:18:38 C 15 58 21.127 +04 17 50.68 V T08
2024-02-02 15:47:10 C 15 58 22.243 +04 17 49.13 V T08
2024-02-08 13:49:41 C 16 03 49.519 +04 11 48.66 V T05
2024-02-08 13:54:16 C 16 03 49.680 +04 11 48.66 V T05
2024-02-08 14:15:05 C 16 03 50.431 +04 11 48.01 V T05
2024-02-08 16:06:03 C 16 03 54.434 +04 11 44.84 V T05
2024-02-10 15:29:16 C 16 05 37.442 +04 10 30.50 V T08
2024-02-10 15:35:31 C 16 05 37.661 +04 10 30.43 V T08
2024-02-10 15:43:33 C 16 05 37.946 +04 10 30.18 V T08
2024-02-11 08:40:14 C 16 06 14.040 +04 10 11.93 V W68
2024-02-11 09:14:18 C 16 06 15.206 +04 10 11.50 V W68
2024-02-11 09:21:05 C 16 06 15.449 +04 10 11.24 V W68
2024-02-12 13:48:37 C 16 07 15.036 +04 09 38.84 V T05
2024-02-12 14:03:00 C 16 07 15.530 +04 09 38.81 V T05
2024-02-12 14:07:34 C 16 07 15.686 +04 09 38.77 V T05
2024-02-12 14:32:45 C 16 07 16.541 +04 09 38.38 V T05
2024-02-15 08:14:37 C 16 09 29.136 +04 09 04.21 V W68
2024-02-15 08:29:01 C 16 09 29.606 +04 09 04.00 V W68
2024-02-15 08:44:08 C 16 09 30.084 +04 09 03.85 V W68
2024-02-15 09:27:27 C 16 09 31.464 +04 09 03.92 V W68
2024-02-18 17:33:35 S 16 12 03.34 +04 09 11.3 L C51
2024-02-18 20:39:09 S 16 12 09.00 +04 09 12.5 L C51
2024-02-18 23:44:44 S 16 12 14.61 +04 09 14.1 L C51
2024-02-19 02:50:17 S 16 12 20.27 +04 09 16.2 L C51
2024-02-19 05:55:52 S 16 12 25.79 +04 09 17.7 L C51
2024-02-19 07:29:11 S 16 12 28.63 +04 09 19.4 L C51
2024-02-19 09:01:15 S 16 12 31.38 +04 09 20.0 L C51
2024-02-19 10:34:45 S 16 12 34.22 +04 09 21.1 L C51
2024-02-19 13:40:20 S 16 12 39.74 +04 09 23.2 L C51
2024-02-19 19:51:16 S 16 12 50.81 +04 09 26.9 L C51
2024-02-20 02:02:14 S 16 13 01.87 +04 09 31.6 L C51
2024-02-20 14:50:34 C 16 13 24.617 +04 09 40.72 V T05
2024-02-20 14:59:17 C 16 13 24.866 +04 09 40.86 V T05
2024-02-20 15:03:51 C 16 13 24.996 +04 09 40.97 V T05
2024-02-20 15:20:43 C 16 13 25.469 +04 09 41.18 V T05
2024-02-21 02:30:39 C 16 13 44.935 +04 09 54.83 V M22
2024-02-21 02:36:35 C 16 13 45.108 +04 09 54.94 V M22
2024-02-21 03:00:29 C 16 13 45.773 +04 09 55.40 V M22
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)