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
2021-02-22 14:14:29 C 15 08 43.03 +27 03 55.9 V T05
2021-02-22 14:22:35 C 15 08 43.00 +27 03 59.5 V T05
2021-02-24 11:57:15 C 15 08 37.25 +27 22 33.2 V T08
2021-02-24 12:01:15 C 15 08 37.24 +27 22 35.0 V T08
2021-02-24 12:09:13 C 15 08 37.22 +27 22 38.1 V T08
2021-02-24 12:19:50 C 15 08 37.16 +27 22 42.6 V T08
2021-02-26 08:46:52 C 15 08 25.03 +27 41 06.3 V 703
2021-02-26 08:54:53 C 15 08 25.00 +27 41 09.6 V 703
2021-02-26 09:02:52 C 15 08 24.95 +27 41 12.9 V 703
2021-02-26 09:10:52 C 15 08 24.93 +27 41 16.5 V 703
2021-03-03 11:00:45 C 15 07 18.19 +28 32 58.1 V 703
2021-03-03 11:08:23 C 15 07 18.09 +28 33 01.5 V 703
2021-03-03 11:16:01 C 15 07 17.99 +28 33 04.8 V 703
2021-03-03 11:23:39 C 15 07 17.90 +28 33 08.1 V 703
2021-03-04 13:32:37 C 15 06 57.07 +28 44 25.0 V T08
2021-03-04 13:36:36 C 15 06 57.02 +28 44 26.8 V T08
2021-03-04 13:45:15 C 15 06 56.89 +28 44 30.5 V T08
2021-03-04 13:54:33 C 15 06 56.75 +28 44 34.6 V T08
2021-03-07 10:25:08 C 15 05 50.64 +29 14 15.4 V 703
2021-03-07 10:32:42 C 15 05 50.50 +29 14 18.9 V 703
2021-03-07 10:40:16 C 15 05 50.35 +29 14 22.1 V 703
2021-03-07 10:47:51 C 15 05 50.22 +29 14 25.4 V 703
2021-03-10 10:04:39 C 15 04 23.56 +29 45 24.6 V G96
2021-03-10 10:12:11 C 15 04 23.38 +29 45 27.9 V G96
2021-03-10 10:19:43 C 15 04 23.20 +29 45 31.2 V G96
2021-03-10 10:27:16 C 15 04 23.02 +29 45 34.4 V G96
2021-03-18 10:19:01 C 14 58 56.97 +31 07 27.3 V 703
2021-03-18 10:26:35 C 14 58 56.70 +31 07 30.3 V 703
2021-03-18 10:34:09 C 14 58 56.42 +31 07 33.3 V 703
2021-03-18 10:41:43 C 14 58 56.16 +31 07 36.7 V 703
2021-03-18 12:36:00 C 14 58 52.33 +31 08 24.9 V T05
2021-03-18 12:38:38 C 14 58 52.24 +31 08 26.0 V T05
2021-03-18 12:43:16 C 14 58 52.07 +31 08 27.9 V T05
2021-03-18 12:50:41 C 14 58 51.81 +31 08 31.1 V T05
2021-03-18 20:10:39 C 14 58 36.84 +31 11 36.3 o C94
2021-03-18 20:12:02 C 14 58 36.83 +31 11 39.2 o C94
2021-03-19 14:53:37 C 14 57 56.692 +31 19 14.21 U F52
2021-03-19 15:01:57 C 14 57 56.377 +31 19 17.56 U F52
2021-03-19 15:10:15 C 14 57 56.069 +31 19 20.92 U F52
2021-03-19 15:18:36 C 14 57 55.763 +31 19 24.29 U F52
2021-03-20 11:56:17 C 14 57 10.70 +31 27 47.8 V T08
2021-03-20 12:24:21 C 14 57 09.62 +31 27 59.3 V T08
2021-03-20 12:48:00 C 14 57 08.71 +31 28 08.9 V T08
2021-03-20 12:51:19 C 14 57 08.58 +31 28 10.2 V T08
2021-03-21 00:02:52 C 14 56 43.40 +31 32 39.0 V K83
2021-03-21 00:04:58 C 14 56 43.30 +31 32 39.6 V K83
2021-03-21 00:08:08 C 14 56 43.19 +31 32 41.0 V K83
2021-03-22 06:45:32 C 14 55 31.86 +31 44 52.4 U I41
2021-03-22 06:47:01 C 14 55 31.79 +31 44 53.1 U I41
2021-03-22 07:16:47 C 14 55 30.57 +31 45 05.0 U I41
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)