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
2025-01-21 04:34:16 C 00 57 14.213 +17 51 53.21 V 703
2025-01-21 04:37:36 C 00 57 14.587 +17 52 00.48 V 703
2025-01-21 05:43:49 C 00 57 22.382 +17 54 32.65 V T08
2025-01-21 05:48:25 C 00 57 22.903 +17 54 43.02 V T08
2025-01-21 06:09:16 C 00 57 25.267 +17 55 29.75 V T08
2025-01-21 06:19:52 C 00 57 26.472 +17 55 53.51 V T08
2025-01-22 03:00:52 C 00 59 49.452 +18 41 51.76 V 703
2025-01-22 03:03:50 C 00 59 49.783 +18 41 58.31 V 703
2025-01-22 03:06:48 C 00 59 50.111 +18 42 04.75 V 703
2025-01-22 03:09:46 C 00 59 50.449 +18 42 11.27 V 703
2025-01-23 03:18:04 C 01 02 36.424 +19 34 33.13 V 703
2025-01-23 03:21:26 C 01 02 36.791 +19 34 40.40 V 703
2025-01-23 03:24:48 C 01 02 37.172 +19 34 47.53 V 703
2025-01-23 03:28:09 C 01 02 37.532 +19 34 54.70 V 703
2025-01-24 03:02:38 C 01 05 18.928 +20 24 43.60 V 703
2025-01-24 03:05:38 C 01 05 19.266 +20 24 49.82 V 703
2025-01-24 03:08:39 C 01 05 19.594 +20 24 56.12 V 703
2025-01-24 03:11:38 C 01 05 19.918 +20 25 02.24 V 703
2025-01-24 05:43:15 C 01 05 37.195 +20 30 20.12 V T08
2025-01-24 05:47:52 C 01 05 37.711 +20 30 29.77 V T08
2025-01-24 05:55:55 C 01 05 38.611 +20 30 46.37 V T08
2025-01-24 06:10:31 C 01 05 40.243 +20 31 16.57 V T08
2025-01-26 02:32:57 C 01 10 42.121 +22 01 16.07 V 703
2025-01-26 02:36:13 C 01 10 42.488 +22 01 22.55 V 703
2025-01-26 02:39:28 C 01 10 42.848 +22 01 29.03 V 703
2025-01-26 02:42:43 C 01 10 43.212 +22 01 35.33 V 703
2025-01-27 03:04:17 C 01 13 28.024 +22 49 10.42 V 703
2025-01-27 03:07:15 C 01 13 28.355 +22 49 16.14 V 703
2025-01-27 03:10:13 C 01 13 28.679 +22 49 21.76 V 703
2025-01-27 03:13:11 C 01 13 29.003 +22 49 27.52 V 703
2025-01-28 07:02:55 C 01 16 36.586 +23 42 18.86 V T08
2025-01-28 07:07:38 C 01 16 37.114 +23 42 27.61 V T08
2025-01-28 07:18:59 C 01 16 38.376 +23 42 48.67 V T08
2025-01-28 07:35:45 C 01 16 40.231 +23 43 19.92 V T08
2025-01-29 06:09:02 C 01 19 12.084 +24 24 59.72 V T08
2025-01-29 06:13:42 C 01 19 12.598 +24 25 08.15 V T08
2025-01-29 06:33:06 C 01 19 14.738 +24 25 43.28 V T08
2025-01-29 06:42:31 C 01 19 15.775 +24 26 00.38 V T08
2025-01-30 21:09:39 C 01 23 33.864 +25 34 36.55 Z C23
2025-01-30 21:39:50 C 01 23 37.217 +25 35 29.08 Z C23
2025-01-31 19:22:40 C 01 26 02.654 +26 13 01.99 Z C23
2025-01-31 20:06:19 C 01 26 07.507 +26 14 16.69 Z C23
2025-01-31 20:49:56 C 01 26 12.346 +26 15 30.64 Z C23
2025-02-01 17:45:42 C 01 28 32.479 +26 50 51.07 Z C23
2025-02-01 18:38:39 C 01 28 38.290 +26 52 18.98 Z C23
2025-02-01 19:14:34 C 01 28 42.271 +26 53 18.82 Z C23
2025-02-02 03:10:04 C 01 29 35.092 +27 06 29.77 V 703
2025-02-02 03:13:03 C 01 29 35.423 +27 06 34.78 V 703
2025-02-02 03:16:03 C 01 29 35.754 +27 06 39.78 V 703
2025-02-02 03:19:02 C 01 29 36.107 +27 06 45.86 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)