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
2022-10-20 11:59:22 C 11 14 21.660 +40 01 18.62 V 703
2022-10-20 12:06:44 C 11 14 22.326 +40 01 18.91 V 703
2022-10-20 12:14:05 C 11 14 23.042 +40 01 18.88 V 703
2022-10-20 12:21:27 C 11 14 23.734 +40 01 19.49 V 703
2022-10-25 14:45:07 C 11 25 48.871 +40 06 30.31 V T08
2022-10-25 15:12:28 C 11 25 51.396 +40 06 31.64 V T08
2022-10-25 15:16:28 C 11 25 51.749 +40 06 32.22 V T08
2022-10-25 15:27:13 C 11 25 52.735 +40 06 32.98 V T08
2022-10-26 12:01:51 C 11 27 46.026 +40 07 38.53 V 703
2022-10-26 12:08:55 C 11 27 46.667 +40 07 39.18 V 703
2022-10-26 12:16:00 C 11 27 47.315 +40 07 39.47 V 703
2022-10-26 12:23:05 C 11 27 47.948 +40 07 39.94 V 703
2022-11-02 14:09:16 C 11 43 01.630 +40 19 52.43 V T08
2022-11-02 14:29:23 C 11 43 03.406 +40 19 54.30 V T08
2022-11-02 14:41:45 C 11 43 04.459 +40 19 55.52 V T08
2022-11-02 14:54:51 C 11 43 05.606 +40 19 56.86 V T08
2022-11-10 04:47:30 C 11 58 41.813 +40 39 50.69 X K74
2022-11-10 04:49:43 C 11 58 42.012 +40 39 51.01 X K74
2022-11-10 04:53:03 C 11 58 42.276 +40 39 51.55 X K74
2022-11-10 04:54:10 C 11 58 42.360 +40 39 51.59 X K74
2022-11-10 04:56:24 C 11 58 42.550 +40 39 51.98 X K74
2022-11-10 04:58:38 C 11 58 42.742 +40 39 51.91 X K74
2022-11-10 13:38:40 C 11 59 26.407 +40 41 01.14 V T08
2022-11-10 13:42:40 C 11 59 26.734 +40 41 02.00 V T08
2022-11-10 13:52:40 C 11 59 27.588 +40 41 03.41 V T08
2022-11-10 14:12:11 C 11 59 29.172 +40 41 06.47 V T08
2022-11-14 12:23:40 C 12 07 15.175 +40 54 49.82 V 703
2022-11-14 12:30:56 C 12 07 15.755 +40 54 50.80 V 703
2022-11-14 12:38:11 C 12 07 16.327 +40 54 52.09 V 703
2022-11-14 12:45:27 C 12 07 16.907 +40 54 53.53 V 703
2022-11-17 11:14:06 C 12 12 57.546 +41 06 44.39 V 703
2022-11-17 11:21:22 C 12 12 58.068 +41 06 45.86 V 703
2022-11-17 11:28:37 C 12 12 58.651 +41 06 47.02 V 703
2022-11-17 11:35:53 C 12 12 59.224 +41 06 48.28 V 703
2022-11-18 14:05:09 C 12 15 05.381 +41 11 38.40 V T08
2022-11-18 14:19:35 C 12 15 06.523 +41 11 41.35 V T08
2022-11-18 14:27:34 C 12 15 07.150 +41 11 42.79 V T08
2022-11-20 11:50:30 C 12 18 40.723 +41 20 27.89 V 703
2022-11-20 11:57:45 C 12 18 41.292 +41 20 29.33 V 703
2022-11-20 12:05:01 C 12 18 41.850 +41 20 30.77 V 703
2022-11-20 12:12:17 C 12 18 42.394 +41 20 32.50 V 703
2022-11-25 12:46:38 C 12 27 54.504 +41 46 55.02 V G96
2022-11-25 12:50:49 C 12 27 54.810 +41 46 55.99 V G96
2022-11-25 13:00:44 C 12 27 55.537 +41 46 58.58 V G96
2022-11-25 13:06:38 C 12 27 55.973 +41 46 59.88 V G96
2022-11-26 07:37:30 S 12 29 18.766 +41 51 25.12 X 275
2022-11-26 11:01:18 C 12 29 33.900 +41 52 16.54 V 703
2022-11-26 11:08:32 C 12 29 34.422 +41 52 18.48 V 703
2022-11-26 11:15:46 C 12 29 34.962 +41 52 20.32 V 703
2022-11-26 11:22:59 C 12 29 35.480 +41 52 21.97 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)