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
2012-03-19 20:49:22 C 03 52 52.84 +49 34 48.7 16.5 o C60
2012-03-19 20:50:59 C 03 52 53.05 +49 34 49.3 16.6 o C60
2012-03-19 20:52:39 C 03 52 53.26 +49 34 50.0 16.6 o C60
2012-03-19 20:54:17 C 03 52 53.45 +49 34 50.7 16.6 o C60
2012-03-19 20:55:57 C 03 52 53.71 +49 34 51.4 16.1 o C60
2012-05-16 23:25:24 C 06 54 17.18 +52 20 03.8 17.0 o C60
2012-05-16 23:29:02 C 06 54 17.68 +52 20 03.5 17.0 o C60
2012-05-16 23:30:52 C 06 54 17.89 +52 20 03.4 17.0 o C60
2012-05-16 23:34:29 C 06 54 18.20 +52 20 01.4 16.9 o C60
2012-05-16 23:36:19 C 06 54 18.57 +52 20 02.2 16.9 o C60
2013-01-05 12:20:56 C 14 23 00.16 +29 22 09.6 u 703
2013-01-05 12:32:23 C 14 23 00.63 +29 22 12.6 u 703
2013-01-05 12:43:58 C 14 23 01.03 +29 22 14.8 u 703
2013-01-05 12:55:25 C 14 23 01.46 +29 22 17.3 u 703
2013-01-25 01:08:24 C 14 37 27.28 +31 36 24.6 o C41
2013-01-25 01:52:25 C 14 37 28.11 +31 36 39.4 o C41
2013-01-27 14:36:43 C 14 38 45.839 +31 59 07.27 L F51
2013-01-27 14:52:49 C 14 38 46.144 +31 59 13.39 L F51
2013-02-10 03:22:25 C 14 42 54.77 +34 15 59.7 c A24
2013-02-10 03:23:27 C 14 42 54.71 +34 16 00.1 c A24
2013-02-10 03:43:52 C 14 42 54.80 +34 16 10.0 c A24
2013-02-10 04:05:20 C 14 42 54.89 +34 16 19.5 c A24
2013-02-10 04:25:46 C 14 42 54.99 +34 16 28.8 c A24
2013-02-10 04:26:49 C 14 42 54.99 +34 16 29.4 c A24
2013-02-19 04:18:13 C 14 42 41.39 +35 59 45.8 c A24
2013-02-19 04:19:16 C 14 42 41.38 +35 59 46.9 c A24
2013-02-20 03:12:23 C 14 42 30.73 +36 11 04.7 c A24
2013-02-20 03:13:25 C 14 42 30.73 +36 11 05.3 c A24
2013-02-20 04:16:14 C 14 42 30.15 +36 11 36.6 c A24
2013-02-23 10:49:03 C 14 41 38.71 +36 50 40.6 u H21
2013-02-23 10:53:06 C 14 41 38.65 +36 50 42.6 u H21
2013-02-23 10:56:46 C 14 41 38.60 +36 50 44.5 u H21
2013-02-23 11:00:26 C 14 41 38.54 +36 50 46.3 u H21
2013-02-25 10:13:44 C 14 40 56.86 +37 14 23.1 u H21
2013-02-25 10:18:44 C 14 40 56.78 +37 14 25.5 u H21
2013-02-25 10:23:44 C 14 40 56.70 +37 14 27.9 u H21
2013-02-25 10:28:44 C 14 40 56.61 +37 14 30.4 u H21
2013-02-25 10:33:43 C 14 40 56.52 +37 14 32.8 u H21
2013-03-04 02:59:00 C 14 37 31.99 +38 34 25.0 c A24
2013-03-04 03:00:01 C 14 37 32.02 +38 34 25.6 c A24
2013-03-04 04:03:17 C 14 37 30.26 +38 34 57.3 c A24
2013-03-22 01:10:55 C 14 20 16.13 +41 44 19.7 c A24
2013-03-22 02:11:17 C 14 20 12.87 +41 44 42.0 c A24
2013-03-22 02:12:20 C 14 20 12.81 +41 44 42.3 c A24
2013-03-24 08:10:48 C 14 17 15.93 +42 03 32.8 u 703
2013-03-24 08:19:49 C 14 17 15.43 +42 03 36.4 u 703
2013-03-24 08:28:54 C 14 17 14.89 +42 03 38.9 u 703
2013-03-24 08:38:03 C 14 17 14.38 +42 03 42.4 u 703
2013-03-28 06:42:16 C 14 11 44.90 +42 32 42.6 u H21
2013-03-28 06:48:05 C 14 11 44.54 +42 32 44.6 u H21
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)