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
2013-06-13 04:46:31 C 12 43 27.07 +33 00 40.0 N I41
2013-06-13 06:32:51 C 12 43 26.44 +32 59 27.0 N I41
2013-06-13 21:27:10 C 12 43 22.07 +32 49 15.6 q B17
2013-06-13 21:49:58 C 12 43 21.97 +32 49 00.1 q B17
2013-06-13 22:00:46 C 12 43 21.92 +32 48 52.8 q B17
2013-06-13 22:32:57 C 12 43 21.76 +32 48 30.6 q B17
2013-06-13 23:00:55 C 12 43 21.70 +32 48 11.5 q B17
2013-06-14 02:20:18 C 12 43 20.87 +32 45 56.4 u H21
2013-06-14 02:26:18 C 12 43 20.83 +32 45 52.5 u H21
2013-06-14 02:32:17 C 12 43 20.83 +32 45 48.4 u H21
2013-06-14 02:38:34 C 12 43 20.79 +32 45 44.0 u H21
2013-06-14 02:45:09 C 12 43 20.77 +32 45 39.4 u H21
2013-06-14 04:35:33 C 12 43 20.30 +32 44 24.4 N I41
2013-06-14 06:07:25 C 12 43 19.84 +32 43 21.2 N I41
2013-06-15 04:42:26 C 12 43 15.04 +32 27 53.2 N I41
2013-06-15 06:09:41 C 12 43 14.70 +32 26 53.1 N I41
2013-06-15 21:24:47 C 12 43 12.29 +32 16 24.6 a 233
2013-06-15 21:43:38 C 12 43 12.22 +32 16 11.3 a 233
2013-06-15 21:54:46 C 12 43 12.19 +32 16 03.7 a 233
2013-06-16 04:29:45 C 12 43 11.41 +32 11 32.6 N I41
2013-06-16 06:21:21 C 12 43 11.11 +32 10 15.4 N I41
2013-06-17 04:49:37 C 12 43 09.25 +31 54 46.4 N I41
2013-06-17 06:07:58 C 12 43 09.09 +31 53 52.0 N I41
2013-06-18 04:31:16 C 12 43 08.69 +31 38 24.1 N I41
2013-06-18 05:16:10 C 12 43 08.61 +31 37 53.0 u 703
2013-06-18 05:23:23 C 12 43 08.61 +31 37 48.0 u 703
2013-06-18 05:30:39 C 12 43 08.61 +31 37 42.7 u 703
2013-06-18 05:37:56 C 12 43 08.61 +31 37 37.8 u 703
2013-06-18 05:45:11 C 12 43 08.61 +31 37 32.5 u 703
2013-06-18 05:46:26 C 12 43 08.64 +31 37 31.8 N I41
2013-07-14 02:24:25 C 12 50 29.79 +24 22 36.8 u H21
2013-07-14 02:29:26 C 12 50 29.92 +24 22 33.4 u H21
2013-07-14 02:34:14 C 12 50 30.02 +24 22 29.8 u H21
2013-07-14 02:39:14 C 12 50 30.13 +24 22 26.2 u H21
2013-07-26 02:11:17 C 12 57 53.74 +21 02 39.1 u H21
2013-07-26 02:17:40 C 12 57 53.90 +21 02 34.5 u H21
2013-07-26 02:24:02 C 12 57 54.07 +21 02 29.6 u H21
2013-07-26 02:27:13 C 12 57 54.17 +21 02 27.4 u H21
2013-07-26 02:32:17 C 12 57 54.30 +21 02 24.2 u H21
2014-11-26 20:32:23 S 11 40 17.94 +48 17 36.0 L C51
2014-11-26 23:41:48 S 11 40 34.39 +48 19 35.2 L C51
2014-11-27 02:51:02 S 11 40 50.81 +48 21 34.6 L C51
2014-11-27 06:00:17 S 11 41 07.20 +48 23 34.0 L C51
2014-11-27 07:35:04 S 11 41 15.42 +48 24 33.7 L C51
2014-11-27 09:09:42 S 11 41 23.65 +48 25 33.3 L C51
2014-11-27 12:19:07 S 11 41 39.99 +48 27 33.4 L C51
2014-11-27 13:53:44 S 11 41 48.16 +48 28 32.9 L C51
2014-11-27 15:28:21 S 11 41 56.33 +48 29 33.4 L C51
2014-11-27 17:02:58 S 11 42 04.49 +48 30 33.1 L C51
2014-11-27 18:37:35 S 11 42 12.62 +48 31 33.4 L C51
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)