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
2024-06-20 20:32:34 C 14 01 27.297 -05 12 08.37 V 089
2024-06-20 20:39:50 C 14 01 26.857 -05 12 14.83 V 089
2024-06-20 20:41:12 C 14 01 26.769 -05 12 15.08 V 089
2024-06-21 01:56:41 C 14 01 07.44 -05 16 28.2 W30
2024-06-21 02:08:23 C 14 01 06.73 -05 16 37.9 W30
2024-06-21 02:18:06 C 14 01 06.07 -05 16 45.5 W30
2024-06-21 07:46:38 C 14 00 45.806 -05 21 09.18 V T08
2024-06-21 07:51:27 C 14 00 45.499 -05 21 13.14 V T08
2024-06-21 08:05:34 C 14 00 44.606 -05 21 24.48 V T08
2024-06-21 08:30:41 C 14 00 43.022 -05 21 44.75 V T08
2024-06-21 21:42:57 C 13 59 55.111 -05 32 29.47 Z C23
2024-06-21 21:48:10 C 13 59 54.802 -05 32 33.43 Z C23
2024-06-21 21:53:55 C 13 59 54.475 -05 32 37.43 Z C23
2024-06-22 21:38:18 C 13 58 30.480 -05 51 54.07 Z C23
2024-06-22 21:40:37 C 13 58 30.362 -05 51 56.09 Z C23
2024-06-22 21:43:31 C 13 58 30.156 -05 51 58.57 Z C23
2024-06-22 23:13:33 B 13 58 25.29 -05 53 02.8 W X16
2024-06-23 00:00:29 B 13 58 22.49 -05 53 41.2 W X16
2024-06-23 03:17:15 B 13 58 10.990 -05 56 29.51 X V72
2024-06-23 03:48:30 B 13 58 09.134 -05 56 55.14 X V72
2024-06-23 04:15:46 B 13 58 07.536 -05 57 17.10 X V72
2024-06-23 04:28:31 C 13 58 06.80 -05 57 27.8 q 463
2024-06-23 04:40:22 C 13 58 06.11 -05 57 37.7 q 463
2024-06-23 04:52:20 C 13 58 05.39 -05 57 47.3 q 463
2024-06-23 19:54:37 C 13 57 14.36 -06 10 04.1 X G02
2024-06-23 19:59:39 C 13 57 14.08 -06 10 08.5 X G02
2024-06-23 20:04:42 C 13 57 13.77 -06 10 12.4 X G02
2024-06-23 21:37:48 C 13 57 08.520 -06 11 28.50 Z C23
2024-06-23 21:50:19 C 13 57 07.795 -06 11 38.80 Z C23
2024-06-24 04:21:37 C 13 56 46.05 -06 16 57.7 q 463
2024-06-24 04:39:37 C 13 56 45.03 -06 17 11.2 q 463
2024-06-24 04:52:47 C 13 56 44.35 -06 17 21.1 q 463
2024-06-24 19:59:02 C 13 55 54.81 -06 29 47.0 X G02
2024-06-24 20:04:37 C 13 55 54.57 -06 29 51.8 X G02
2024-06-24 20:10:13 C 13 55 54.25 -06 29 56.5 X G02
2024-06-25 02:55:25 C 13 55 32.42 -06 35 27.6 W30
2024-06-25 03:20:13 C 13 55 31.06 -06 35 47.6 W30
2024-06-25 04:15:16 C 13 55 28.21 -06 36 34.8 q 463
2024-06-25 04:25:19 C 13 55 27.63 -06 36 42.5 q 463
2024-06-25 04:41:56 C 13 55 26.74 -06 36 56.1 q 463
2024-06-25 07:37:30 C 13 55 17.417 -06 39 17.82 V T08
2024-06-25 07:45:00 C 13 55 17.002 -06 39 23.94 V T08
2024-06-25 07:49:40 C 13 55 16.752 -06 39 27.76 V T08
2024-06-25 08:04:37 C 13 55 15.929 -06 39 40.14 V T08
2024-06-25 21:36:10 C 13 54 33.504 -06 50 51.40 Z C23
2024-06-25 22:06:04 C 13 54 31.894 -06 51 16.27 Z C23
2024-06-25 22:21:42 C 13 54 31.080 -06 51 29.20 Z C23
2024-06-26 20:30:46 B 13 53 23.614 -07 09 45.79 V 160
2024-06-26 20:34:59 B 13 53 23.407 -07 09 49.50 V 160
2024-06-27 06:28:44 C 13 52 54.168 -07 17 58.24 V T05
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)