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
2018-05-12 09:36:12 C 12 13 33.45 +48 02 11.7 U T08
2018-05-13 06:10:46 C 12 12 56.15 +47 50 09.5 U 703
2018-05-13 06:21:36 C 12 12 55.82 +47 50 03.0 U 703
2018-05-13 06:29:20 C 12 12 55.59 +47 49 58.4 U 703
2018-05-13 06:37:04 C 12 12 55.35 +47 49 53.8 U 703
2018-05-14 10:14:51 C 12 12 07.76 +47 33 32.7 U T05
2018-05-14 10:22:09 C 12 12 07.54 +47 33 28.2 U T05
2018-05-14 10:41:38 C 12 12 06.99 +47 33 16.5 U T05
2018-05-14 10:42:17 C 12 12 06.96 +47 33 16.1 U T05
2018-05-14 11:02:47 C 12 12 06.44 +47 33 03.5 U T05
2018-05-14 11:05:53 C 12 12 06.30 +47 33 01.7 U T05
2018-05-14 11:14:14 C 12 12 06.06 +47 32 57.0 U T05
2018-05-14 11:25:01 C 12 12 05.78 +47 32 50.2 U T05
2018-05-14 11:28:06 C 12 12 05.65 +47 32 48.5 U T05
2018-05-14 11:40:50 C 12 12 05.32 +47 32 40.7 U T05
2018-05-14 12:00:33 C 12 12 04.74 +47 32 28.6 U T05
2018-05-14 12:19:53 C 12 12 04.20 +47 32 16.8 U T05
2018-05-16 09:26:00 C 12 10 53.48 +47 05 07.0 U T08
2018-05-16 09:39:54 C 12 10 53.11 +47 04 58.2 U T08
2018-05-16 09:54:53 C 12 10 52.74 +47 04 49.2 U T08
2018-05-16 09:56:13 C 12 10 52.71 +47 04 47.9 U T08
2018-05-16 10:06:46 C 12 10 52.44 +47 04 41.5 U T08
2018-05-16 10:15:08 C 12 10 52.23 +47 04 36.3 U T08
2018-05-16 10:36:06 C 12 10 51.69 +47 04 23.3 U T08
2018-05-16 10:48:28 C 12 10 51.35 +47 04 15.7 U T08
2018-05-16 15:39:48 C 12 10 44.55 +47 01 16.2 o C94
2018-05-16 15:46:58 C 12 10 44.22 +47 01 12.8 o C94
2018-05-18 05:56:59 C 12 09 51.18 +46 37 44.1 U 703
2018-05-18 06:04:46 C 12 09 50.97 +46 37 39.3 U 703
2018-05-18 06:12:33 C 12 09 50.80 +46 37 34.4 U 703
2018-05-18 06:20:20 C 12 09 50.64 +46 37 29.5 U 703
2018-05-18 08:41:40 C 12 09 47.58 +46 36 02.7 U T05
2018-05-18 08:44:20 C 12 09 47.51 +46 36 00.7 U T05
2018-05-18 08:59:53 C 12 09 47.14 +46 35 51.4 U T05
2018-05-18 09:01:11 C 12 09 47.12 +46 35 50.5 U T05
2018-05-18 09:11:43 C 12 09 46.88 +46 35 44.1 U T05
2018-05-18 09:14:21 C 12 09 46.85 +46 35 42.4 U T05
2018-05-18 09:24:39 C 12 09 46.59 +46 35 35.7 U T05
2018-05-18 09:25:57 C 12 09 46.55 +46 35 34.7 U T05
2018-05-18 09:26:37 C 12 09 46.53 +46 35 34.6 U T05
2018-05-18 09:41:05 C 12 09 46.23 +46 35 25.4 U T05
2018-05-18 09:41:45 C 12 09 46.17 +46 35 24.7 U T05
2018-05-18 09:50:06 C 12 09 45.97 +46 35 20.1 U T05
2018-05-20 05:57:22 C 12 08 52.18 +46 07 41.6 U G96
2018-05-20 06:04:55 C 12 08 52.03 +46 07 36.8 U G96
2018-05-20 06:12:28 C 12 08 51.87 +46 07 32.0 U G96
2018-05-20 06:20:00 C 12 08 51.73 +46 07 27.2 U G96
2018-05-20 09:20:34 C 12 08 48.30 +46 05 33.6 U T08
2018-05-20 10:05:56 C 12 08 47.38 +46 05 05.0 U T08
2018-05-20 10:19:09 C 12 08 47.11 +46 04 56.3 U T08
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)