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
2014-11-27 20:12:23 S 11 42 20.78 +48 32 33.7 L C51
2014-11-27 21:47:00 S 11 42 28.93 +48 33 33.9 L C51
2014-11-27 23:21:37 S 11 42 37.06 +48 34 33.8 L C51
2014-11-28 05:40:16 S 11 43 09.55 +48 38 35.6 L C51
2014-11-28 08:49:31 S 11 43 25.79 +48 40 36.5 L C51
2014-12-08 05:04:43 C 12 02 32.51 +51 20 23.9 r 006
2014-12-08 05:15:04 C 12 02 33.22 +51 20 31.0 r 006
2014-12-08 05:24:50 C 12 02 34.06 +51 20 38.5 r 006
2014-12-08 05:34:59 C 12 02 34.73 +51 20 45.4 r 006
2014-12-12 03:58:32 C 12 09 31.50 +52 29 27.2 c A24
2014-12-12 03:59:34 C 12 09 31.56 +52 29 27.8 c A24
2015-01-06 03:46:32 C 12 40 26.48 +60 38 45.5 u B88
2015-01-06 04:02:36 C 12 40 26.86 +60 38 59.2 u B88
2015-01-06 04:18:42 C 12 40 27.27 +60 39 13.4 u B88
2015-01-06 04:49:31 C 12 40 28.04 +60 39 40.5 c A24
2015-01-06 04:50:33 C 12 40 28.07 +60 39 41.3 c A24
2015-01-08 11:08:26 C 12 41 44.96 +61 26 32.1 u H21
2015-01-08 11:11:11 C 12 41 44.99 +61 26 34.3 u H21
2015-01-08 11:13:55 C 12 41 45.03 +61 26 36.4 u H21
2015-01-08 11:16:40 C 12 41 45.11 +61 26 39.0 u H21
2015-01-22 21:46:16 C 12 41 04.03 +66 18 55.8 r 168
2015-01-22 21:56:21 C 12 41 03.77 +66 19 04.0 r 168
2015-01-22 22:44:31 C 12 41 02.28 +66 19 42.8 r 168
2015-01-22 22:49:22 C 12 41 02.13 +66 19 47.3 r 168
2015-02-01 17:46:33 C 12 29 25.75 +69 14 55.8 o C94
2015-02-01 17:57:32 C 12 29 25.04 +69 15 03.9 o C94
2015-02-01 18:08:33 C 12 29 24.16 +69 15 11.2 o C94
2015-02-06 07:57:29 C 12 20 17.93 +70 24 53.2 q H21
2015-02-06 08:00:48 C 12 20 17.62 +70 24 55.1 q H21
2015-02-06 08:04:24 C 12 20 17.30 +70 24 57.4 q H21
2015-02-06 08:08:00 C 12 20 16.95 +70 24 59.6 q H21
2015-02-06 08:11:52 C 12 20 16.53 +70 25 01.7 q H21
2015-02-06 08:13:56 C 12 20 16.27 +70 25 03.2 q H21
2015-02-06 08:18:48 C 12 20 15.90 +70 25 05.9 q H21
2015-03-01 20:40:44 C 11 03 48.45 +73 05 21.2 q K14
2015-03-01 21:28:46 C 11 03 41.15 +73 05 19.9 q K14
2015-03-06 20:11:43 C 10 46 20.97 +72 50 12.9 q K14
2015-03-06 20:34:46 C 10 46 17.78 +72 50 08.5 q K14
2015-03-06 20:56:02 C 10 46 14.73 +72 50 04.9 q K14
2015-03-08 05:44:36 C 10 41 43.19 +72 43 08.2 u H21
2015-03-08 05:48:51 C 10 41 42.63 +72 43 07.1 u H21
2015-03-08 05:52:25 C 10 41 42.16 +72 43 06.6 u H21
2015-03-08 05:55:43 C 10 41 41.58 +72 43 05.9 u H21
2015-03-08 06:00:18 C 10 41 40.98 +72 43 04.8 u H21
2015-03-09 05:31:14 C 10 38 32.40 +72 37 23.5 q H21
2015-03-09 05:38:11 C 10 38 31.47 +72 37 21.8 q H21
2015-03-09 05:44:51 C 10 38 30.58 +72 37 20.0 q H21
2015-03-09 05:51:58 C 10 38 29.62 +72 37 18.1 q H21
2015-03-09 07:01:17 C 10 38 20.27 +72 37 00.2 q H21
2015-03-09 07:09:30 C 10 38 19.14 +72 36 58.2 q 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)