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
2024-05-01 00:18:06 B 15 48 58.054 +05 19 23.92 V L65
2024-05-01 00:22:14 B 15 48 57.689 +05 19 23.34 V L65
2024-05-01 01:33:17 C 15 48 52.33 +05 19 16.7 V J43
2024-05-01 01:42:50 C 15 48 51.58 +05 19 15.5 V J43
2024-05-01 01:52:01 C 15 48 50.88 +05 19 14.3 V J43
2024-05-01 21:44:32 C 15 47 19.637 +05 16 31.40 Z C23
2024-05-01 21:47:59 C 15 47 19.385 +05 16 30.76 Z C23
2024-05-01 21:51:27 C 15 47 19.063 +05 16 30.61 Z C23
2024-05-02 10:40:22 C 15 46 19.063 +05 14 42.58 V T05
2024-05-02 10:45:22 C 15 46 18.658 +05 14 41.89 V T05
2024-05-02 10:49:55 C 15 46 18.293 +05 14 41.24 V T05
2024-05-02 11:24:57 C 15 46 15.475 +05 14 36.02 V T05
2024-05-03 22:04:01 C 15 43 29.746 +05 09 02.05 Z C23
2024-05-03 22:06:19 C 15 43 29.508 +05 09 01.69 Z C23
2024-05-03 22:12:25 C 15 43 29.066 +05 09 00.65 Z C23
2024-05-04 08:35:05 C 15 42 38.135 +05 07 14.95 V G96
2024-05-04 08:42:29 C 15 42 37.519 +05 07 13.58 V G96
2024-05-04 08:49:52 C 15 42 36.896 +05 07 12.32 V G96
2024-05-04 08:57:16 C 15 42 36.284 +05 07 10.99 V G96
2024-05-05 04:25:19 C 15 41 00.060 +05 03 45.76 V W68
2024-05-05 04:31:20 C 15 40 59.566 +05 03 44.75 V W68
2024-05-05 05:02:02 C 15 40 56.950 +05 03 38.99 V W68
2024-05-05 05:07:17 C 15 40 56.491 +05 03 38.16 V W68
2024-05-06 09:27:00 C 15 38 33.101 +04 57 53.35 V 703
2024-05-06 09:30:19 C 15 38 32.809 +04 57 52.63 V 703
2024-05-06 09:33:39 C 15 38 32.521 +04 57 51.95 V 703
2024-05-06 09:36:58 C 15 38 32.233 +04 57 51.30 V 703
2024-05-06 12:14:10 C 15 38 18.854 +04 57 20.02 V T05
2024-05-06 12:18:44 C 15 38 18.456 +04 57 19.04 V T05
2024-05-06 12:59:34 C 15 38 14.890 +04 57 10.48 V T05
2024-05-06 13:40:40 C 15 38 11.309 +04 57 01.80 V T05
2024-05-07 01:14:40 C 15 37 11.808 +04 54 40.00 V M22
2024-05-07 01:54:24 C 15 37 08.326 +04 54 31.28 V M22
2024-05-07 02:35:30 C 15 37 04.714 +04 54 22.25 V M22
2024-05-07 03:11:35 C 15 37 01.562 +04 54 14.29 V M22
2024-05-07 22:44:18 C 15 35 20.033 +04 49 39.65 Z C23
2024-05-07 22:47:13 C 15 35 19.730 +04 49 39.25 Z C23
2024-05-07 22:50:06 C 15 35 19.536 +04 49 38.53 Z C23
2024-05-08 10:46:13 C 15 34 16.100 +04 46 51.17 V 703
2024-05-08 10:49:29 C 15 34 15.820 +04 46 50.41 V 703
2024-05-08 10:52:45 C 15 34 15.521 +04 46 49.58 V 703
2024-05-08 10:56:00 C 15 34 15.233 +04 46 48.86 V 703
2024-05-08 20:30:52 C 15 33 24.859 +04 44 26.56 Z C23
2024-05-08 20:35:19 C 15 33 24.468 +04 44 25.37 Z C23
2024-05-08 20:39:47 C 15 33 24.014 +04 44 24.32 Z C23
2024-05-09 04:07:20 C 15 32 44.038 +04 42 43.20 V W68
2024-05-09 04:10:35 C 15 32 43.742 +04 42 42.48 V W68
2024-05-09 04:15:47 C 15 32 43.265 +04 42 41.11 V W68
2024-05-09 04:16:26 C 15 32 43.214 +04 42 40.14 V W68
2024-05-09 04:19:03 C 15 32 42.970 +04 42 39.46 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)