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
2008-02-08 10:11:06 C 15 09 55.90 +23 27 19.1 r 703
2008-02-08 10:22:26 C 15 09 56.08 +23 27 22.7 r 703
2008-02-08 10:33:49 C 15 09 56.12 +23 27 28.2 r 703
2008-02-20 02:20:39 C 15 12 58.35 +25 02 02.2 r J51
2008-02-20 02:30:46 C 15 12 58.41 +25 02 05.9 r J51
2008-02-20 02:36:18 C 15 12 58.47 +25 02 07.9 r J51
2008-03-02 11:24:23 C 15 12 19.15 +26 49 41.5 r 703
2008-03-02 11:33:42 C 15 12 19.08 +26 49 45.5 r 703
2008-03-02 11:43:02 C 15 12 19.00 +26 49 49.5 r 703
2008-03-02 11:52:22 C 15 12 18.90 +26 49 53.2 r 703
2008-03-04 07:52:54 C 15 11 50.25 +27 08 11.0 c 704
2008-03-04 08:09:18 C 15 11 50.08 +27 08 18.1 c 704
2008-03-04 08:25:25 C 15 11 49.84 +27 08 25.0 c 704
2008-03-04 08:41:33 C 15 11 49.64 +27 08 31.8 c 704
2008-03-04 08:57:42 C 15 11 49.41 +27 08 39.2 c 704
2008-03-20 07:16:41 C 15 02 47.51 +29 48 21.5 r H45
2008-03-20 07:17:50 C 15 02 47.48 +29 48 21.9 r H45
2008-03-20 07:21:00 C 15 02 47.35 +29 48 23.1 r H45
2008-03-20 07:23:26 C 15 02 47.27 +29 48 24.0 r H45
2008-03-20 07:25:15 C 15 02 47.21 +29 48 24.6 r H45
2008-03-22 07:22:36 C 15 01 01.70 +30 07 23.8 r H45
2008-03-22 07:24:46 C 15 01 01.61 +30 07 24.7 r H45
2008-03-22 07:26:55 C 15 01 01.50 +30 07 25.7 r H45
2008-03-22 07:29:09 C 15 01 01.43 +30 07 26.4 r H45
2008-03-22 07:32:42 C 15 01 01.30 +30 07 27.8 r H45
2008-03-23 23:50:47 C 14 59 26.31 +30 23 01.1 c J40
2008-03-23 23:53:10 C 14 59 26.22 +30 23 02.3 c J40
2008-03-24 00:05:20 C 14 59 25.69 +30 23 07.1 c J40
2008-03-29 02:04:14 C 14 54 02.28 +31 07 25.2 r 084
2008-03-29 02:08:28 C 14 54 02.09 +31 07 26.6 r 084
2008-03-30 05:58:46 C 14 52 41.50 +31 16 53.3 c 704
2008-03-30 06:15:33 C 14 52 40.67 +31 16 59.0 c 704
2008-03-30 06:32:29 C 14 52 39.81 +31 17 04.6 c 704
2008-03-30 06:49:13 C 14 52 38.97 +31 17 10.8 c 704
2008-04-01 20:23:30 C 14 49 30.72 +31 36 51.8 o B66
2008-04-01 21:23:17 C 14 49 27.52 +31 37 10.4 o B66
2008-04-02 20:26:19 C 14 48 13.88 +31 44 07.1 o B66
2008-04-02 21:26:48 C 14 48 10.61 +31 44 25.3 o B66
2008-04-03 05:36:30 C 14 47 44.12 +31 46 50.3 r 703
2008-04-03 05:45:54 C 14 47 43.62 +31 46 53.0 r 703
2008-04-03 05:55:19 C 14 47 43.11 +31 46 56.0 r 703
2008-04-03 06:04:40 C 14 47 42.57 +31 46 58.4 r 703
2008-04-05 07:21:45 C 14 44 58.16 +32 00 45.6 c 704
2008-04-05 07:38:10 C 14 44 57.22 +32 00 50.1 c 704
2008-04-05 07:54:33 C 14 44 56.15 +32 00 54.1 c 704
2008-04-05 22:25:48 C 14 44 06.59 +32 04 42.6 c B61
2008-04-05 23:10:49 C 14 44 03.98 +32 04 54.6 c B61
2008-04-05 23:48:38 C 14 44 01.80 +32 05 05.3 c B61
2008-04-06 10:03:29 C 14 43 25.92 +32 07 42.8 r H45
2008-04-06 10:07:27 C 14 43 25.70 +32 07 43.9 r H45
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)