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
2010-03-25 01:16:31 C 12 22 31.55 +61 56 26.8 17.5 o 084
2010-03-26 20:25:48 C 12 18 28.65 +61 52 17.4 17.4 u C20
2010-03-26 20:30:02 C 12 18 28.26 +61 52 16.9 17.6 u C20
2010-03-27 06:02:44 C 12 17 35.17 +61 51 07.5 c 704
2010-03-27 06:17:53 C 12 17 33.75 +61 51 06.1 c 704
2010-03-27 06:33:13 C 12 17 32.32 +61 51 04.2 c 704
2010-03-27 06:48:24 C 12 17 30.85 +61 51 02.4 c 704
2010-03-27 07:03:31 C 12 17 29.43 +61 51 00.5 c 704
2010-03-30 21:56:19 C 12 09 36.01 +61 36 45.0 16.8 u 084
2010-03-31 23:50:02 C 12 07 19.37 +61 31 15.3 17.9 u 084
2010-03-31 23:54:12 C 12 07 19.04 +61 31 14.3 17.6 u 084
2010-04-01 23:20:43 C 12 05 17.46 +61 25 48.0 17.4 o 084
2010-04-14 21:25:16 C 11 42 20.06 +59 35 50.1 18.0 o 084
2010-04-14 21:29:26 C 11 42 19.80 +59 35 47.9 17.9 o 084
2010-04-16 21:21:41 C 11 39 30.56 +59 13 24.3 18.0 u C20
2010-04-16 21:25:56 C 11 39 30.32 +59 13 22.3 18.0 u C20
2010-04-19 20:58:56 C 11 35 40.69 +58 37 41.3 17.7 u C20
2010-04-19 21:03:10 C 11 35 40.48 +58 37 39.1 17.8 u C20
2010-04-20 20:56:18 C 11 34 30.02 +58 25 12.1 18.0 u C20
2010-04-20 21:00:32 C 11 34 29.80 +58 25 09.8 17.8 u C20
2010-04-25 21:21:57 C 11 29 20.79 +57 18 49.5 17.7 u 084
2010-04-28 17:08:49 C 11 26 59.82 +56 39 11.4 18.1 u C20
2010-04-28 17:13:03 C 11 26 59.67 +56 39 09.0 17.8 u C20
2010-04-29 22:43:08 C 11 26 04.97 +56 21 25.1 18.8 u C20
2010-04-29 22:47:22 C 11 26 04.83 +56 21 22.8 17.8 u C20
2010-05-09 14:17:54 S 11 21 17.85 +53 54 58.5 L C51
2010-05-09 17:28:25 S 11 21 15.54 +53 52 53.2 L C51
2010-05-09 20:38:56 S 11 21 13.23 +53 50 48.0 L C51
2010-05-09 23:49:27 S 11 21 10.92 +53 48 42.7 L C51
2010-05-10 01:24:37 S 11 21 09.87 +53 47 41.0 L C51
2010-05-10 02:59:47 S 11 21 08.76 +53 46 37.7 L C51
2010-05-10 02:59:58 S 11 21 08.72 +53 46 37.8 L C51
2010-05-10 04:35:08 S 11 21 07.68 +53 45 35.0 L C51
2010-05-10 06:10:18 S 11 21 06.59 +53 44 32.3 L C51
2010-05-10 07:45:40 S 11 21 05.45 +53 43 29.7 L C51
2010-05-10 09:20:49 S 11 21 04.44 +53 42 26.8 L C51
2010-05-10 10:56:10 S 11 21 03.36 +53 41 23.9 L C51
2010-05-10 12:31:21 S 11 21 02.299 +53 40 21.14 L C51
2010-05-10 14:06:41 S 11 21 01.294 +53 39 18.43 L C51
2010-05-10 15:41:52 S 11 21 00.269 +53 38 15.58 L C51
2010-05-10 17:17:13 S 11 20 59.249 +53 37 13.15 L C51
2010-05-10 20:27:44 S 11 20 57.286 +53 35 06.90 L C51
2010-05-10 23:38:15 S 11 20 55.310 +53 33 00.97 L C51
2010-05-11 02:48:46 S 11 20 53.395 +53 30 54.83 L C51
2010-05-11 05:37:59 C 11 20 51.39 +53 29 04.5 r 703
2010-05-11 05:46:59 C 11 20 51.25 +53 28 58.3 r 703
2010-05-11 05:55:53 C 11 20 51.14 +53 28 52.5 r 703
2010-05-11 06:04:53 C 11 20 51.03 +53 28 46.4 r 703
2010-06-10 04:00:52 C 11 27 19.11 +45 15 12.7 r 703
2010-06-10 04:08:15 C 11 27 19.22 +45 15 07.4 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)