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
2024-04-20 14:14:25 C 16 05 21.615 +05 36 00.91 X F52
2024-04-20 14:25:43 C 16 05 21.013 +05 35 59.36 X F52
2024-04-20 21:40:22 C 16 04 57.370 +05 36 00.61 V M22
2024-04-20 21:42:58 C 16 04 57.221 +05 36 00.47 V M22
2024-04-20 22:14:51 C 16 04 55.406 +05 36 00.14 V M22
2024-04-20 22:22:44 C 16 04 54.955 +05 35 59.96 V M22
2024-04-21 16:12:35 C 16 03 54.511 +05 35 39.73 V P07
2024-04-21 17:00:34 C 16 03 51.686 +05 35 38.33 V P07
2024-04-21 17:53:16 C 16 03 48.576 +05 35 37.50 V P07
2024-04-21 19:04:30 C 16 03 44.333 +05 35 35.81 V P07
2024-04-23 05:41:34 C 16 01 41.990 +05 34 33.89 V W68
2024-04-23 05:44:50 C 16 01 41.791 +05 34 33.82 V W68
2024-04-23 05:52:03 C 16 01 41.342 +05 34 33.53 V W68
2024-04-23 06:10:25 C 16 01 40.198 +05 34 32.95 V W68
2024-04-27 07:30:46 C 15 55 22.814 +05 28 50.02 V W68
2024-04-27 08:05:08 C 15 55 20.398 +05 28 47.24 V W68
2024-04-27 08:09:41 C 15 55 20.081 +05 28 46.81 V W68
2024-04-27 08:19:20 C 15 55 19.399 +05 28 46.02 V W68
2024-04-28 11:17:55 C 15 53 26.666 +05 26 16.55 V T05
2024-04-28 11:20:31 C 15 53 26.472 +05 26 16.37 V T05
2024-04-28 11:25:05 C 15 53 26.141 +05 26 15.90 V T05
2024-04-28 11:47:10 C 15 53 24.526 +05 26 13.81 V T05
2024-04-28 17:29:41 B 15 53 00.26 +05 25 41.3 Z O53
2024-04-28 17:41:53 B 15 52 59.37 +05 25 40.1 Z O53
2024-04-28 17:53:38 B 15 52 58.50 +05 25 38.9 Z O53
2024-04-28 21:43:25 C 15 52 42.180 +05 25 12.04 Z C23
2024-04-28 21:45:30 C 15 52 42.058 +05 25 11.68 Z C23
2024-04-28 21:47:32 C 15 52 41.892 +05 25 11.21 Z C23
2024-04-29 01:45:38 C 15 52 24.358 +05 24 56.63 V M22
2024-04-29 01:50:15 C 15 52 24.024 +05 24 56.12 V M22
2024-04-29 02:02:05 C 15 52 23.150 +05 24 54.86 V M22
2024-04-29 02:17:54 C 15 52 21.989 +05 24 53.28 V M22
2024-04-29 22:13:28 B 15 50 55.231 +05 22 34.39 V 160
2024-04-29 22:18:22 B 15 50 54.833 +05 22 33.74 V 160
2024-04-29 22:23:11 B 15 50 54.439 +05 22 33.35 V 160
2024-04-30 11:05:42 C 15 49 57.418 +05 21 04.93 V 703
2024-04-30 11:08:57 C 15 49 57.173 +05 21 04.57 V 703
2024-04-30 11:12:12 C 15 49 56.924 +05 21 04.14 V 703
2024-04-30 11:15:27 C 15 49 56.672 +05 21 03.78 V 703
2024-04-30 22:53:08 C 15 49 04.476 +05 19 35.60 V 089
2024-04-30 22:55:30 C 15 49 04.295 +05 19 35.30 V 089
2024-04-30 22:57:52 C 15 49 04.109 +05 19 35.01 V 089
2024-04-30 23:00:14 C 15 49 03.924 +05 19 34.66 V 089
2024-04-30 23:02:36 C 15 49 03.746 +05 19 34.38 V 089
2024-04-30 23:04:58 C 15 49 03.560 +05 19 34.05 V 089
2024-04-30 23:07:20 C 15 49 03.385 +05 19 33.79 V 089
2024-04-30 23:09:42 C 15 49 03.208 +05 19 33.42 V 089
2024-04-30 23:12:04 C 15 49 03.014 +05 19 33.10 V 089
2024-04-30 23:14:26 C 15 49 02.840 +05 19 32.76 V 089
2024-05-01 00:13:58 B 15 48 58.414 +05 19 24.56 V L65
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)