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
2011-05-20 00:32:22 C 15 22 07.19 -00 30 24.3 u 585
2011-05-20 00:34:29 C 15 22 06.94 -00 30 25.3 u 585
2011-05-20 00:36:35 C 15 22 06.71 -00 30 26.3 u 585
2011-05-20 00:38:40 C 15 22 06.49 -00 30 27.4 u 585
2011-05-20 00:40:47 C 15 22 06.27 -00 30 28.4 u 585
2011-05-20 06:47:46 C 15 21 28.08 -00 33 26.2 r 703
2011-05-20 06:59:10 C 15 21 26.85 -00 33 31.7 r 703
2011-05-20 07:10:31 C 15 21 25.63 -00 33 37.4 r 703
2011-05-20 07:21:59 C 15 21 24.40 -00 33 42.9 r 703
2011-05-20 23:15:06 C 15 19 44.15 -00 41 39.3 u A06
2011-05-20 23:22:25 C 15 19 43.36 -00 41 43.1 u A06
2011-05-20 23:29:45 C 15 19 42.56 -00 41 46.8 u A06
2011-05-22 22:51:39 C 15 14 40.56 -01 06 26.9 c A24
2011-05-22 22:52:41 C 15 14 40.47 -01 06 27.3 c A24
2011-05-23 20:38:16 C 15 12 20.82 -01 18 18.7 c A24
2011-05-23 20:39:18 C 15 12 20.73 -01 18 19.0 c A24
2011-05-23 21:29:15 C 15 12 15.25 -01 18 46.7 c A24
2011-05-23 21:30:17 C 15 12 15.12 -01 18 47.3 c A24
2011-05-25 21:51:33 C 15 07 02.40 -01 46 17.7 u C01
2011-05-25 21:52:57 C 15 07 02.25 -01 46 18.5 u C01
2011-05-25 23:51:46 C 15 06 49.22 -01 47 27.9 u C01
2011-05-25 23:53:09 C 15 06 49.07 -01 47 28.8 u C01
2011-05-29 05:40:05 C 14 58 24.74 -02 34 56.1 r G96
2011-05-29 05:50:49 C 14 58 23.55 -02 35 03.0 r G96
2011-05-29 06:01:28 C 14 58 22.40 -02 35 09.8 r G96
2011-05-29 06:12:10 C 14 58 21.21 -02 35 16.6 r G96
2011-05-29 21:00:27 C 14 56 45.54 -02 44 45.5 r 203
2011-05-29 21:40:21 C 14 56 41.18 -02 45 11.1 r 203
2011-05-29 22:23:52 C 14 56 36.40 -02 45 39.4 c A24
2011-05-29 22:24:55 C 14 56 36.29 -02 45 40.0 c A24
2011-05-29 23:30:38 C 14 56 29.08 -02 46 22.4 c A24
2011-05-29 23:31:40 C 14 56 28.98 -02 46 22.9 c A24
2011-05-30 12:21:44 C 14 55 06.37 -02 54 41.4 u 379
2011-05-30 12:27:43 C 14 55 05.71 -02 54 44.9 u 379
2011-05-30 12:30:24 C 14 55 05.41 -02 54 46.5 u 379
2011-05-30 12:38:47 C 14 55 04.50 -02 54 52.1 u 379
2011-05-30 12:41:29 C 14 55 04.21 -02 54 53.7 u 379
2011-05-30 21:20:48 C 14 54 08.43 -03 00 35.4 c A24
2011-05-30 21:21:49 C 14 54 08.25 -03 00 36.6 c A24
2011-06-01 05:44:04 C 14 50 40.21 -03 22 09.8 u H45
2011-06-01 05:46:02 C 14 50 39.99 -03 22 11.1 u H45
2011-06-01 05:47:35 C 14 50 39.82 -03 22 12.3 u H45
2011-06-01 05:49:48 C 14 50 39.58 -03 22 13.6 u H45
2011-06-01 05:51:04 C 14 50 39.44 -03 22 14.6 u H45
2011-06-02 23:35:57 C 14 46 13.93 -03 50 55.7 u J93
2011-06-02 23:49:29 C 14 46 12.51 -03 51 05.2 u J93
2011-06-02 23:52:52 C 14 46 12.13 -03 51 07.6 u J93
2011-06-03 20:34:52 C 14 44 01.96 -04 05 40.1 o 639
2011-06-03 20:43:12 C 14 44 01.04 -04 05 46.1 o 639
2011-06-03 20:52:02 C 14 44 00.17 -04 05 52.8 o 639
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)