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
2006-10-20 10:44:55 C 08 43 44.97 +26 15 05.0 c 704
2006-10-20 11:01:39 C 08 43 46.45 +26 15 36.0 c 704
2006-10-20 11:18:42 C 08 43 47.98 +26 16 07.4 c 704
2006-10-20 11:36:16 C 08 43 49.56 +26 16 39.6 c 704
2006-10-21 10:50:17 C 08 45 57.85 +26 59 12.4 r 703
2006-10-21 11:04:38 C 08 45 59.14 +26 59 39.0 r 703
2006-10-21 11:19:01 C 08 46 00.40 +27 00 05.4 r 703
2006-10-21 11:34:27 C 08 46 01.81 +27 00 33.9 r 703
2006-10-27 10:58:47 C 08 59 08.73 +31 26 18.3 r 703
2006-10-27 11:08:09 C 08 59 09.56 +31 26 36.0 r 703
2006-10-27 11:17:32 C 08 59 10.42 +31 26 53.6 r 703
2006-10-27 11:27:00 C 08 59 11.25 +31 27 11.4 r 703
2006-11-09 04:18:53 C 09 26 10.25 +41 07 50.9 14.1 r 084
2006-11-09 04:21:02 C 09 26 10.44 +41 07 55.1 14.2 r 084
2006-11-20 11:56:54 C 09 48 01.51 +49 55 12.4 r 703
2006-11-20 12:04:15 C 09 48 02.05 +49 55 26.8 r 703
2006-11-20 12:11:45 C 09 48 02.55 +49 55 41.3 r 703
2006-11-20 12:19:09 C 09 48 03.09 +49 55 55.7 r 703
2006-12-08 23:20:42 C 10 12 47.60 +63 42 28.2 15.0 o 084
2006-12-09 09:24:46 C 10 13 05.40 +64 00 06.7 c 704
2006-12-09 09:43:30 C 10 13 05.85 +64 00 39.4 c 704
2006-12-09 10:02:15 C 10 13 06.32 +64 01 12.6 c 704
2006-12-18 22:51:27 C 10 14 04.74 +70 15 50.8 14.5 o 084
2006-12-18 22:53:36 C 10 14 04.68 +70 15 54.1 14.5 o 084
2006-12-25 22:17:07 C 10 04 51.95 +74 12 55.1 14.8 o 084
2006-12-25 22:19:16 C 10 04 51.76 +74 12 57.9 14.8 o 084
2006-12-30 03:34:01 C 09 53 08.89 +76 16 26.8 14.8 o 084
2006-12-30 03:36:10 C 09 53 08.59 +76 16 29.2 14.8 o 084
2007-01-09 10:44:25 C 08 58 03.86 +79 54 55.2 r H45
2007-01-09 10:46:06 C 08 58 03.38 +79 54 56.2 r H45
2007-01-09 10:47:19 C 08 58 02.93 +79 54 56.7 r H45
2007-01-09 10:49:29 C 08 58 02.29 +79 54 58.0 r H45
2007-01-09 10:50:21 C 08 58 02.02 +79 54 58.6 r H45
2007-01-12 23:29:57 C 08 30 28.86 +80 36 31.4 15.1 o 084
2007-01-12 23:32:06 C 08 30 28.10 +80 36 32.3 15.2 o 084
2007-01-14 18:22:30 C 08 15 30.29 +80 50 17.0 c 127
2007-01-14 18:25:32 C 08 15 29.22 +80 50 17.9 c 127
2007-01-14 18:27:32 C 08 15 28.51 +80 50 18.4 c 127
2007-01-14 18:36:12 C 08 15 25.43 +80 50 21.0 c 127
2007-01-15 18:19:41 C 08 06 58.14 +80 55 52.9 c 127
2007-01-15 18:23:54 C 08 06 56.52 +80 55 53.7 c 127
2007-01-15 18:27:56 C 08 06 55.16 +80 55 54.7 c 127
2007-01-15 18:32:00 C 08 06 53.61 +80 55 55.4 c 127
2007-01-15 18:36:01 C 08 06 52.26 +80 55 56.7 c 127
2007-01-23 20:19:08 C 07 01 54.67 +80 50 03.5 o A32
2007-01-23 20:28:01 C 07 01 52.00 +80 50 01.6 o A32
2007-01-23 20:37:02 C 07 01 49.34 +80 49 59.6 o A32
2007-01-23 20:46:16 C 07 01 46.56 +80 49 57.5 o A32
2007-01-23 20:54:57 C 07 01 44.00 +80 49 55.4 o A32
2007-01-24 16:40:56 C 06 56 08.44 +80 44 55.0 15.1 o 084
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)