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
2007-02-24 02:03:32 C 05 56 09.16 +74 29 39.9 16.2 o 084
2007-02-25 20:18:43 C 05 57 50.40 +74 05 31.3 16.3 o 084
2007-02-25 20:20:52 C 05 57 50.48 +74 05 30.0 16.3 o 084
2007-02-27 04:30:52 C 05 59 17.76 +73 47 10.7 d 712
2007-02-27 04:40:45 C 05 59 18.24 +73 47 06.8 d 712
2007-02-27 04:52:56 C 05 59 18.54 +73 46 56.8 d 712
2007-02-27 05:12:15 C 05 59 19.59 +73 46 46.9 d 712
2007-02-28 03:42:29 C 06 00 26.04 +73 34 00.5 d 712
2007-02-28 03:58:00 C 06 00 26.81 +73 33 52.0 d 712
2007-02-28 04:08:30 C 06 00 27.12 +73 33 45.7 d 712
2007-02-28 04:18:45 C 06 00 27.70 +73 33 40.0 d 712
2007-02-28 04:29:29 C 06 00 28.23 +73 33 33.7 d 712
2007-03-02 05:33:36 C 06 03 04.76 +73 05 46.3 c H45
2007-03-02 05:35:44 C 06 03 04.99 +73 05 45.0 c H45
2007-03-02 05:37:12 C 06 03 05.00 +73 05 44.3 c H45
2007-03-02 05:44:04 C 06 03 05.39 +73 05 40.1 c H45
2007-03-02 05:45:04 C 06 03 05.45 +73 05 39.5 c H45
2007-03-07 04:00:49 C 06 10 25.04 +71 59 28.3 c 704
2007-03-07 04:16:57 C 06 10 26.01 +71 59 19.5 c 704
2007-03-07 04:33:04 C 06 10 27.01 +71 59 10.1 c 704
2007-03-07 04:49:21 C 06 10 28.00 +71 59 00.8 c 704
2007-03-07 05:05:40 C 06 10 29.18 +71 58 51.6 c 704
2007-03-11 21:05:06 C 06 18 27.84 +70 56 59.8 c A24
2007-03-11 21:06:33 C 06 18 27.94 +70 56 58.8 c A24
2007-03-11 21:44:34 C 06 18 30.70 +70 56 37.4 c A24
2007-03-11 21:46:01 C 06 18 30.83 +70 56 36.9 c A24
2007-03-11 22:24:18 C 06 18 33.62 +70 56 15.4 c A24
2007-03-11 22:25:45 C 06 18 33.71 +70 56 14.6 c A24
2007-03-11 22:39:42 C 06 18 34.96 +70 56 06.1 o B24
2007-03-11 22:42:56 C 06 18 35.18 +70 56 04.2 o B24
2007-03-11 22:46:09 C 06 18 35.42 +70 56 02.5 o B24
2007-03-12 20:18:33 C 06 20 13.30 +70 44 15.6 c A24
2007-03-12 20:38:06 C 06 20 14.73 +70 44 04.8 c A24
2007-03-12 21:00:19 C 06 20 16.38 +70 43 52.5 c A24
2007-03-12 21:01:45 C 06 20 16.46 +70 43 51.8 c A24
2007-03-12 21:12:29 C 06 20 17.26 +70 43 45.9 c A24
2007-03-12 21:22:28 C 06 20 18.01 +70 43 40.3 c A24
2007-03-12 21:32:08 C 06 20 18.73 +70 43 35.0 c A24
2007-03-12 21:33:33 C 06 20 18.85 +70 43 34.2 c A24
2007-03-12 21:50:43 C 06 20 20.11 +70 43 24.7 c A24
2007-03-12 22:07:06 C 06 20 21.36 +70 43 15.4 c A24
2007-03-12 22:23:09 C 06 20 22.57 +70 43 06.5 c A24
2007-03-12 22:24:35 C 06 20 22.65 +70 43 05.7 c A24
2007-03-12 22:37:18 C 06 20 23.60 +70 42 58.7 c A24
2007-03-12 22:57:26 C 06 20 25.08 +70 42 47.6 c A24
2007-03-12 23:14:41 C 06 20 26.33 +70 42 38.1 c A24
2007-03-12 23:32:47 C 06 20 27.68 +70 42 28.2 c A24
2007-03-12 23:51:06 C 06 20 29.02 +70 42 18.1 c A24
2007-03-13 20:44:28 C 06 22 06.01 +70 30 53.7 c A24
2007-03-13 20:59:49 C 06 22 07.18 +70 30 45.2 c A24
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)