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
2004-12-02 11:37:58 C 13 21 07.76 +34 10 24.0 c 704
2004-12-02 11:55:20 C 13 21 08.75 +34 10 25.0 c 704
2004-12-02 12:13:28 C 13 21 09.80 +34 10 26.6 c 704
2004-12-02 12:30:51 C 13 21 10.83 +34 10 27.5 c 704
2005-01-01 02:30:40 C 13 57 14.79 +36 22 51.1 o 084
2005-01-15 02:54:09 C 14 08 59.88 +38 26 19.0 o 084
2005-01-18 10:40:48 C 14 11 07.01 +39 01 06.4 d 703
2005-01-18 10:54:26 C 14 11 07.34 +39 01 12.4 d 703
2005-01-18 11:08:06 C 14 11 07.73 +39 01 18.9 d 703
2005-01-18 11:21:46 C 14 11 08.02 +39 01 24.3 d 703
2005-02-08 23:39:02 C 14 16 59.65 +43 26 08.5 o 084
2005-02-10 00:33:45 C 14 16 52.67 +43 40 07.7 o 084
2005-02-15 11:09:19 C 14 15 35.21 +44 53 55.8 r H41
2005-02-15 11:11:51 C 14 15 35.16 +44 53 57.1 r H41
2005-02-15 11:14:16 C 14 15 35.15 +44 53 58.3 r H41
2005-02-26 21:34:17 C 14 08 55.36 +47 25 44.2 c A65
2005-02-26 21:39:27 C 14 08 55.12 +47 25 47.1 c A65
2005-02-26 21:44:35 C 14 08 54.99 +47 25 49.8 c A65
2005-03-02 03:05:17 C 14 06 01.32 +48 06 05.0 o 084
2005-03-04 17:28:30 C 14 03 22.39 +48 37 08.4 o 084
2005-03-04 17:34:12 C 14 03 22.11 +48 37 11.4 o 084
2005-03-06 00:54:30 C 14 01 55.49 +48 52 18.5 o 084
2005-03-06 01:00:10 C 14 01 55.23 +48 52 21.2 o 084
2005-03-10 08:59:35 C 13 56 37.97 +49 39 22.3 c H45
2005-03-10 09:02:19 C 13 56 37.87 +49 39 24.4 c H45
2005-03-10 09:04:32 C 13 56 37.69 +49 39 24.6 c H45
2005-03-10 09:07:31 C 13 56 37.57 +49 39 26.6 c H45
2005-03-16 02:09:03 C 13 48 33.24 +50 32 46.5 o 084
2005-03-16 02:14:42 C 13 48 32.87 +50 32 48.2 o 084
2005-03-20 00:45:19 C 13 42 20.83 +51 02 53.0 o A32
2005-03-20 00:51:46 C 13 42 20.40 +51 02 54.7 o A32
2005-03-20 00:59:50 C 13 42 19.91 +51 02 57.5 o A32
2005-03-20 01:07:54 C 13 42 19.34 +51 02 59.5 o A32
2005-03-21 00:20:51 C 13 40 43.78 +51 09 26.0 o 084
2005-03-21 00:26:31 C 13 40 43.37 +51 09 27.5 o 084
2005-03-22 00:20:06 C 13 39 03.49 +51 15 42.0 o 084
2005-03-22 00:25:45 C 13 39 03.14 +51 15 43.5 o 084
2005-03-22 23:06:39 C 13 37 27.02 +51 21 15.5 o 084
2005-03-22 23:12:18 C 13 37 26.62 +51 21 16.9 o 084
2005-03-24 23:42:35 C 13 33 57.23 +51 31 51.9 o A32
2005-03-24 23:55:58 C 13 33 56.25 +51 31 53.8 o A32
2005-03-25 00:09:02 C 13 33 55.47 +51 31 57.7 o A32
2005-03-27 00:42:58 C 13 30 20.75 +51 40 41.7 o 084
2005-03-27 00:47:37 C 13 30 20.36 +51 40 42.5 o 084
2005-03-27 08:58:39 C 13 29 43.96 +51 42 02.3 c 699
2005-03-27 09:21:52 C 13 29 42.16 +51 42 05.6 c 699
2005-03-27 09:44:32 C 13 29 40.43 +51 42 09.0 c 699
2005-03-27 10:07:04 C 13 29 38.72 +51 42 12.7 c 699
2005-04-01 01:32:35 C 13 21 13.11 +51 54 26.3 o 084
2005-04-01 01:37:13 C 13 21 12.74 +51 54 26.9 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)