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
2024-05-14 08:55:01 C 15 21 10.631 +04 05 34.40 V 703
2024-05-14 08:58:16 C 15 21 10.314 +04 05 33.22 V 703
2024-05-14 09:01:32 C 15 21 09.997 +04 05 32.06 V 703
2024-05-14 09:04:46 C 15 21 09.695 +04 05 30.95 V 703
2024-05-14 09:32:16 C 15 21 07.428 +04 05 21.77 V T05
2024-05-14 09:34:52 C 15 21 07.174 +04 05 20.94 V T05
2024-05-14 09:39:25 C 15 21 06.730 +04 05 19.39 V T05
2024-05-14 09:47:14 C 15 21 05.966 +04 05 16.66 V T05
2024-05-14 18:54:56 C 15 20 13.915 +04 02 13.74 V M22
2024-05-14 19:26:15 C 15 20 10.882 +04 02 03.12 V M22
2024-05-14 19:28:54 C 15 20 10.625 +04 02 02.29 V M22
2024-05-14 19:35:33 C 15 20 09.991 +04 02 00.24 V M22
2024-05-14 22:41:02 B 15 19 51.943 +04 00 44.21 V L65
2024-05-14 22:45:09 B 15 19 51.533 +04 00 42.77 V L65
2024-05-14 22:49:17 B 15 19 51.137 +04 00 41.33 V L65
2024-05-15 00:13:39 C 15 19 42.89 +04 00 12.1 V M34
2024-05-15 00:17:43 C 15 19 42.47 +04 00 10.6 V M34
2024-05-15 00:35:55 C 15 19 40.69 +04 00 04.3 V M34
2024-05-16 16:44:37 C 15 15 48.255 +03 45 18.62 O18
2024-05-16 18:49:30 C 15 15 35.877 +03 44 30.49 O18
2024-05-16 19:22:15 C 15 15 32.646 +03 44 18.05 O18
2024-05-17 03:28:35 C 15 14 45.595 +03 41 18.60 V W68
2024-05-17 04:01:52 C 15 14 42.278 +03 41 05.60 V W68
2024-05-17 04:09:50 C 15 14 41.489 +03 41 02.54 V W68
2024-05-17 04:21:54 C 15 14 40.286 +03 40 57.90 V W68
2024-05-17 19:15:16 C 15 13 12.788 +03 34 53.99 O18
2024-05-17 20:26:11 C 15 13 05.724 +03 34 25.15 O18
2024-05-17 20:34:22 C 15 13 05.489 +03 34 22.01 V M52
2024-05-17 21:08:11 C 15 13 02.110 +03 34 08.26 V M52
2024-05-17 21:21:52 B 15 13 00.739 +03 34 02.28 V 160
2024-05-17 21:26:43 B 15 13 00.257 +03 34 00.34 V 160
2024-05-17 21:31:32 B 15 12 59.774 +03 33 58.39 V 160
2024-05-18 04:51:47 C 15 12 16.718 +03 31 00.73 V G96
2024-05-18 04:59:52 C 15 12 15.916 +03 30 57.42 V G96
2024-05-18 05:07:57 C 15 12 15.102 +03 30 54.11 V G96
2024-05-18 05:16:03 C 15 12 14.292 +03 30 50.76 V G96
2024-05-18 18:46:34 C 15 10 54.276 +03 25 14.02 O18
2024-05-18 19:48:10 C 15 10 48.113 +03 24 47.98 O18
2024-05-18 20:46:46 C 15 10 42.790 +03 24 32.94 V M22
2024-05-18 20:50:48 C 15 10 42.382 +03 24 31.25 V M22
2024-05-18 20:54:53 C 15 10 41.971 +03 24 29.48 V M22
2024-05-18 21:02:19 C 15 10 41.225 +03 24 26.42 V M22
2024-05-18 22:11:49 C 15 10 34.27 +03 23 46.5 X G02
2024-05-18 22:16:31 C 15 10 33.79 +03 23 44.4 X G02
2024-05-18 22:21:12 C 15 10 33.30 +03 23 42.4 X G02
2024-05-19 14:22:59 C 15 08 58.656 +03 17 00.35 V P07
2024-05-19 15:08:03 C 15 08 54.137 +03 16 40.69 V P07
2024-05-19 16:27:27 C 15 08 46.128 +03 16 06.20 V P07
2024-05-19 17:47:34 C 15 08 38.023 +03 15 31.25 V P07
2024-05-19 17:47:42 C 15 08 38.016 +03 15 31.25 V P07
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)