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
2007-02-04 21:40:42 C 06 05 42.43 +78 51 06.7 c A24
2007-02-04 21:57:19 C 06 05 40.60 +78 50 58.0 c A24
2007-02-04 22:13:27 C 06 05 38.65 +78 50 49.1 c A24
2007-02-04 22:14:54 C 06 05 38.61 +78 50 48.3 c A24
2007-02-04 22:25:18 C 06 05 37.50 +78 50 43.1 c A24
2007-02-04 22:29:53 C 06 05 36.90 +78 50 40.2 c A24
2007-02-04 22:37:44 C 06 05 36.15 +78 50 36.5 c A24
2007-02-04 22:46:21 C 06 05 35.14 +78 50 31.5 c A24
2007-02-04 22:54:08 C 06 05 34.38 +78 50 27.5 c A24
2007-02-04 23:01:21 C 06 05 33.36 +78 50 23.2 c A24
2007-02-04 23:02:48 C 06 05 33.27 +78 50 22.9 c A24
2007-02-04 23:17:56 C 06 05 31.58 +78 50 14.6 c A24
2007-02-04 23:34:31 C 06 05 29.79 +78 50 05.8 c A24
2007-02-04 23:49:40 C 06 05 28.06 +78 49 57.6 c A24
2007-02-04 23:51:06 C 06 05 27.97 +78 49 56.7 c A24
2007-02-08 01:15:17 C 05 59 07.79 +78 10 15.1 15.9 o 084
2007-02-08 01:17:26 C 05 59 07.61 +78 10 13.4 15.9 o 084
2007-02-09 19:59:21 C 05 56 33.27 +77 46 28.7 15.8 o 084
2007-02-09 20:01:30 C 05 56 33.09 +77 46 27.9 15.9 o 084
2007-02-11 19:13:09 C 05 54 31.82 +77 19 45.4 c A24
2007-02-11 19:14:37 C 05 54 31.72 +77 19 44.8 c A24
2007-02-11 20:17:37 C 05 54 29.18 +77 19 09.2 c A24
2007-02-11 22:25:05 C 05 54 24.22 +77 17 55.4 c A24
2007-02-11 22:26:32 C 05 54 24.13 +77 17 54.5 c A24
2007-02-13 21:52:28 C 05 53 11.27 +76 50 43.9 c A24
2007-02-13 21:53:55 C 05 53 11.13 +76 50 42.9 c A24
2007-02-13 22:26:04 C 05 53 10.52 +76 50 23.3 c A24
2007-02-13 22:58:10 C 05 53 09.74 +76 50 05.4 c A24
2007-02-13 23:30:17 C 05 53 09.12 +76 49 46.3 c A24
2007-02-13 23:31:46 C 05 53 09.10 +76 49 45.6 c A24
2007-02-15 20:38:33 C 05 52 39.71 +76 23 46.1 c A24
2007-02-15 20:39:59 C 05 52 39.68 +76 23 45.4 c A24
2007-02-15 20:59:47 C 05 52 39.51 +76 23 33.8 c A24
2007-02-15 21:20:32 C 05 52 39.34 +76 23 21.6 c A24
2007-02-15 21:40:48 C 05 52 39.11 +76 23 09.5 c A24
2007-02-15 21:42:14 C 05 52 39.09 +76 23 08.9 c A24
2007-02-15 21:54:59 C 05 52 38.98 +76 23 01.5 c A24
2007-02-15 22:13:47 C 05 52 38.78 +76 22 50.5 c A24
2007-02-15 22:36:21 C 05 52 38.58 +76 22 37.4 c A24
2007-02-16 21:12:07 C 05 52 37.24 +76 09 33.7 c A24
2007-02-16 21:13:39 C 05 52 37.25 +76 09 33.0 c A24
2007-02-16 21:37:28 C 05 52 37.21 +76 09 18.8 c A24
2007-02-16 22:00:27 C 05 52 37.14 +76 09 05.4 c A24
2007-02-16 22:23:07 C 05 52 37.03 +76 08 51.9 c A24
2007-02-16 22:24:35 C 05 52 37.06 +76 08 51.1 c A24
2007-02-16 22:46:30 C 05 52 37.01 +76 08 38.2 c A24
2007-02-16 23:04:54 C 05 52 36.97 +76 08 27.3 c A24
2007-02-16 23:22:43 C 05 52 36.94 +76 08 16.8 c A24
2007-02-18 18:49:03 C 05 52 57.42 +75 43 09.8 c A24
2007-02-18 19:46:26 C 05 52 57.81 +75 42 36.6 c A24
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)