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
2007-04-08 21:05:22 C 07 16 46.65 +64 56 36.8 c A24
2007-04-09 19:42:50 C 07 18 52.37 +64 44 37.7 c A24
2007-04-09 19:44:17 C 07 18 52.52 +64 44 36.8 c A24
2007-04-09 20:04:07 C 07 18 54.32 +64 44 26.1 c A24
2007-04-09 20:25:24 C 07 18 56.26 +64 44 14.6 c A24
2007-04-09 20:45:15 C 07 18 58.05 +64 44 03.9 c A24
2007-04-09 20:46:40 C 07 18 58.21 +64 44 03.2 c A24
2007-04-09 22:53:11 C 07 19 09.94 +64 42 53.9 o 084
2007-04-09 22:57:22 C 07 19 10.31 +64 42 51.7 o 084
2007-04-10 19:45:15 C 07 21 06.00 +64 31 52.5 c A24
2007-04-10 19:46:43 C 07 21 06.13 +64 31 51.7 c A24
2007-04-10 20:07:08 C 07 21 07.99 +64 31 40.8 c A24
2007-04-10 20:29:01 C 07 21 09.98 +64 31 29.0 c A24
2007-04-10 20:49:26 C 07 21 11.84 +64 31 18.0 c A24
2007-04-10 20:50:53 C 07 21 12.00 +64 31 17.2 c A24
2007-04-11 19:50:07 C 07 23 19.93 +64 19 05.8 c A24
2007-04-11 19:51:35 C 07 23 20.10 +64 19 05.1 c A24
2007-04-11 20:20:24 C 07 23 22.71 +64 18 49.6 c A24
2007-04-11 20:50:40 C 07 23 25.48 +64 18 33.2 c A24
2007-04-11 21:19:28 C 07 23 28.09 +64 18 17.6 c A24
2007-04-11 21:20:55 C 07 23 28.26 +64 18 16.8 c A24
2007-04-14 21:00:09 C 07 30 07.31 +63 40 14.4 c A24
2007-04-14 21:01:35 C 07 30 07.42 +63 40 13.4 c A24
2007-04-18 21:37:55 C 07 39 05.72 +62 48 50.0 o A32
2007-04-18 21:44:09 C 07 39 06.30 +62 48 46.3 o A32
2007-04-18 21:55:46 C 07 39 07.37 +62 48 40.0 o A32
2007-04-18 22:01:06 C 07 39 07.86 +62 48 37.0 o A32
2007-04-18 22:07:23 C 07 39 08.44 +62 48 33.7 o A32
2007-04-20 02:57:20 C 07 41 49.05 +62 33 14.6 r 703
2007-04-20 03:03:52 C 07 41 49.63 +62 33 10.8 r 703
2007-04-20 03:16:48 C 07 41 50.78 +62 33 03.9 r 703
2007-04-26 04:06:05 C 07 55 14.01 +61 15 45.3 c 704
2007-04-26 04:18:13 C 07 55 15.10 +61 15 39.5 c 704
2007-04-26 04:30:22 C 07 55 16.24 +61 15 31.9 c 704
2007-04-26 04:42:25 C 07 55 17.35 +61 15 25.8 c 704
2007-04-26 04:54:30 C 07 55 18.45 +61 15 19.5 c 704
2007-05-10 03:33:05 C 08 25 41.33 +58 15 18.4 c 704
2007-05-10 03:46:38 C 08 25 42.55 +58 15 11.0 c 704
2007-05-10 04:00:18 C 08 25 43.75 +58 15 03.6 c 704
2007-05-10 04:14:07 C 08 25 44.95 +58 14 56.0 c 704
2007-05-10 04:27:50 C 08 25 46.17 +58 14 48.2 c 704
2007-06-14 03:56:12 C 09 37 04.33 +50 34 52.2 r 703
2007-06-14 04:06:39 C 09 37 05.16 +50 34 46.3 r 703
2007-06-14 04:17:10 C 09 37 05.98 +50 34 40.9 r 703
2007-06-14 04:27:59 C 09 37 06.88 +50 34 34.7 r 703
2008-01-01 12:20:45 C 14 41 30.91 +20 49 38.7 r 703
2008-01-01 12:30:08 C 14 41 31.34 +20 49 39.8 r 703
2008-01-01 12:39:29 C 14 41 31.70 +20 49 39.8 r 703
2008-01-01 12:48:53 C 14 41 32.10 +20 49 40.1 r 703
2008-02-08 09:59:45 C 15 09 55.72 +23 27 15.5 r 703
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)