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
2024-04-03 19:00:58 C 16 20 50.06 +05 18 59.3 u 323
2024-04-03 19:17:27 C 16 20 49.73 +05 19 00.7 u 323
2024-04-03 19:33:43 B 16 20 49.42 +05 18 57.6 Z O53
2024-04-03 20:13:24 B 16 20 48.45 +05 19 00.5 Z O53
2024-04-04 19:12:51 B 16 20 16.32 +05 20 47.2 Z O53
2024-04-04 19:54:02 B 16 20 15.25 +05 20 50.3 Z O53
2024-04-04 20:38:44 B 16 20 14.09 +05 20 53.7 Z O53
2024-04-05 12:14:49 C 16 19 50.904 +05 22 03.43 V T05
2024-04-05 12:48:56 C 16 19 49.980 +05 22 05.99 V T05
2024-04-05 13:34:37 C 16 19 48.737 +05 22 09.34 V T05
2024-04-05 19:11:20 B 16 19 40.16 +05 22 34.7 Z O53
2024-04-05 19:57:44 B 16 19 38.88 +05 22 38.2 Z O53
2024-04-05 20:49:55 B 16 19 37.43 +05 22 42.1 Z O53
2024-04-06 19:01:05 B 16 19 01.64 +05 24 17.4 Z O53
2024-04-06 19:42:21 B 16 19 00.42 +05 24 20.4 Z O53
2024-04-06 20:26:42 B 16 18 59.11 +05 24 23.6 Z O53
2024-04-08 10:02:01 C 16 17 53.009 +05 26 54.49 V T05
2024-04-08 10:13:56 C 16 17 52.627 +05 26 55.39 V T05
2024-04-08 10:23:51 C 16 17 52.310 +05 26 56.00 V T05
2024-04-08 18:08:18 B 16 17 37.74 +05 27 26.4 Z O53
2024-04-08 18:49:39 B 16 17 36.37 +05 27 29.0 Z O53
2024-04-08 19:31:16 B 16 17 34.99 +05 27 31.7 Z O53
2024-04-10 19:19:36 C 16 15 58.63 +05 30 24.8 u 323
2024-04-10 19:59:47 C 16 15 57.14 +05 30 26.6 u 323
2024-04-11 19:47:03 C 16 15 05.10 +05 31 40.6 u 323
2024-04-11 20:05:28 C 16 15 04.34 +05 31 41.3 u 323
2024-04-12 10:54:46 C 16 14 30.541 +05 32 16.22 V G96
2024-04-12 11:02:11 C 16 14 30.221 +05 32 16.91 V G96
2024-04-12 11:09:36 C 16 14 29.922 +05 32 17.23 V G96
2024-04-13 17:53:44 C 16 13 16.418 +05 33 40.50 V P07
2024-04-13 19:03:45 C 16 13 13.418 +05 33 43.09 V P07
2024-04-13 20:27:46 C 16 13 09.809 +05 33 46.22 V P07
2024-04-13 21:42:11 C 16 13 06.583 +05 33 49.43 V P07
2024-04-14 20:20:21 C 16 12 09.00 +05 34 36.8 u 323
2024-04-14 20:37:53 C 16 12 08.21 +05 34 37.5 u 323
2024-04-14 21:55:10 B 16 12 05.275 +05 34 31.66 V 160
2024-04-14 22:00:08 B 16 12 05.033 +05 34 32.34 V 160
2024-04-14 22:05:00 B 16 12 04.783 +05 34 32.05 V 160
2024-04-15 02:53:14 B 16 11 51.929 +05 34 41.63 Z Z93
2024-04-15 03:29:33 B 16 11 50.275 +05 34 42.60 Z Z93
2024-04-15 04:03:40 B 16 11 48.727 +05 34 43.75 Z Z93
2024-04-17 01:42:11 C 16 09 42.850 +05 35 53.74 V M22
2024-04-17 01:49:35 C 16 09 42.490 +05 35 53.92 V M22
2024-04-17 02:00:47 C 16 09 41.933 +05 35 54.02 V M22
2024-04-17 02:05:21 C 16 09 41.710 +05 35 54.17 V M22
2024-04-20 10:47:24 C 16 05 33.353 +05 36 03.35 V T05
2024-04-20 10:50:00 C 16 05 33.206 +05 36 03.24 V T05
2024-04-20 10:54:33 C 16 05 32.950 +05 36 03.24 V T05
2024-04-20 11:02:28 C 16 05 32.506 +05 36 03.13 V T05
2024-04-20 14:03:03 C 16 05 22.255 +05 36 01.02 X F52
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)