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
2003-05-18 02:01:00 C 14 26 20.94 +18 27 37.4 m 859
2003-05-18 02:02:36 C 14 26 20.85 +18 27 36.8 m 859
2003-05-18 02:07:33 C 14 26 20.49 +18 27 35.4 m 859
2003-05-18 02:09:09 C 14 26 20.33 +18 27 34.5 m 859
2003-05-18 02:14:08 C 14 26 19.94 +18 27 32.7 m 859
2003-05-18 02:15:43 C 14 26 19.84 +18 27 32.4 m 859
2003-05-19 22:06:25 C 14 23 05.77 +18 11 41.4 c 084
2003-05-21 21:50:37 C 14 19 38.62 +17 53 01.0 A30
2003-05-21 21:50:44 C 14 19 38.66 +17 53 01.6 c 203
2003-05-21 22:00:44 C 14 19 37.91 +17 52 57.1 A30
2003-05-21 22:10:48 C 14 19 37.17 +17 52 52.8 A30
2003-05-21 22:20:46 C 14 19 36.45 +17 52 48.9 A30
2003-05-21 22:38:18 C 14 19 35.20 +17 52 42.1 c 203
2003-05-22 21:17:40 C 14 17 58.71 +17 43 15.8 c 203
2003-05-22 22:49:49 C 14 17 52.03 +17 42 36.3 c 203
2003-05-23 21:28:29 C 14 16 16.88 +17 32 47.9 c 203
2003-05-23 22:15:01 C 14 16 13.57 +17 32 27.2 c 203
2003-05-23 22:24:14 C 14 16 12.92 +17 32 23.1 c 203
2003-05-24 21:21:10 C 14 14 37.77 +17 22 04.3 d 151
2003-05-24 21:23:11 C 14 14 37.63 +17 22 03.5 d 151
2003-05-24 21:30:00 C 14 14 37.15 +17 22 00.3 d 151
2003-05-24 21:32:03 C 14 14 37.01 +17 21 59.4 d 151
2003-05-24 23:32:45 C 14 14 28.67 +17 21 03.4 c J93
2003-05-24 23:35:47 C 14 14 28.46 +17 21 02.3 c J93
2003-05-24 23:38:50 C 14 14 28.22 +17 21 00.6 c J93
2003-05-24 23:41:53 C 14 14 28.04 +17 20 59.3 c J93
2003-05-24 23:44:57 C 14 14 27.81 +17 20 57.8 c J93
2003-05-25 21:24:21 C 14 12 59.38 +17 10 52.7 c 084
2003-05-27 21:50:56 C 14 09 46.18 +16 47 13.6 c 084
2003-05-28 15:33:15 C 14 08 37.14 +16 38 16.1 379
2003-05-28 15:35:42 C 14 08 37.00 +16 38 14.8 379
2003-05-28 15:40:56 C 14 08 36.67 +16 38 11.9 379
2003-05-28 21:56:23 C 14 08 12.77 +16 34 58.1 d 170
2003-05-28 22:00:08 C 14 08 12.53 +16 34 56.3 d 170
2003-05-28 22:02:24 C 14 08 12.36 +16 34 54.8 d 170
2003-05-29 13:11:11 C 14 07 14.48 +16 27 00.5 355
2003-05-29 13:14:05 C 14 07 14.27 +16 26 59.9 355
2003-05-29 13:16:53 C 14 07 14.10 +16 26 57.9 355
2003-05-29 13:19:43 C 14 07 13.93 +16 26 56.1 355
2003-05-30 05:03:42 C 14 06 14.659 +16 18 34.13 g 689
2003-05-31 01:26:02 C 14 04 59.18 +16 07 33.9 15.2 d H72
2003-05-31 01:28:49 C 14 04 58.84 +16 07 29.3 15.2 d H72
2003-05-31 01:35:24 C 14 04 58.62 +16 07 28.7 15.2 d H72
2003-05-31 01:39:12 C 14 04 58.41 +16 07 26.7 15.2 d H72
2003-05-31 01:41:23 C 14 04 58.21 +16 07 23.6 15.3 d H72
2003-05-31 11:36:37 C 14 04 21.54 +16 01 57.7 16.4 c 608
2003-05-31 11:51:44 C 14 04 20.62 +16 01 49.2 16.6 c 608
2003-05-31 12:06:36 C 14 04 19.70 +16 01 41.1 16.5 c 608
2003-06-01 04:39:26 C 14 03 20.19 +15 52 26.9 c 333
2003-06-01 04:42:04 C 14 03 20.02 +15 52 25.3 c 333
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)