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
2003-04-03 00:23:32 C 15 37 05.39 +17 59 48.8 c 084
2003-04-06 22:20:52 C 15 33 10.60 +18 24 58.4 c 127
2003-04-06 22:29:02 C 15 33 10.22 +18 25 00.5 c 127
2003-04-06 22:37:49 C 15 33 09.83 +18 25 02.9 c 127
2003-04-06 22:45:08 C 15 33 09.50 +18 25 04.7 c 127
2003-04-07 23:16:52 C 15 32 02.29 +18 31 18.3 c 127
2003-04-07 23:23:57 C 15 32 01.96 +18 31 20.1 c 127
2003-04-07 23:32:43 C 15 32 01.54 +18 31 22.3 c 127
2003-04-08 23:03:59 C 15 30 54.85 +18 37 10.4 c 084
2003-04-09 11:23:49 C 15 30 18.91 +18 40 11.4 15.6 c 644
2003-04-09 11:40:35 C 15 30 18.05 +18 40 15.0 15.5 c 644
2003-04-09 11:55:47 C 15 30 17.32 +18 40 19.0 15.6 c 644
2003-04-09 23:55:26 C 15 29 42.13 +18 43 08.8 c 198
2003-04-10 00:01:40 C 15 29 41.83 +18 43 10.4 c 198
2003-04-10 00:07:55 C 15 29 41.51 +18 43 12.0 c 198
2003-04-10 00:15:43 C 15 29 41.11 +18 43 13.9 c 198
2003-04-10 00:17:16 C 15 29 41.03 +18 43 14.3 c 198
2003-04-11 07:37:28 C 15 28 05.92 +18 50 29.2 o 699
2003-04-11 07:56:36 C 15 28 04.92 +18 50 33.4 o 699
2003-04-11 08:15:42 C 15 28 03.91 +18 50 37.7 o 699
2003-04-11 08:23:44 C 15 28 03.61 +18 50 39.8 m 333
2003-04-11 08:34:50 C 15 28 02.89 +18 50 42.2 o 699
2003-04-11 08:36:14 C 15 28 02.85 +18 50 42.6 m 333
2003-04-11 08:48:55 C 15 28 02.20 +18 50 45.4 m 333
2003-04-11 09:01:30 C 15 28 01.51 +18 50 48.5 m 333
2003-04-11 09:14:01 C 15 28 00.87 +18 50 51.0 m 333
2003-04-15 21:34:25 C 15 22 03.13 +19 12 59.6 c 084
2003-04-17 20:51:56 C 15 19 13.91 +19 21 07.7 d 151
2003-04-17 20:57:04 C 15 19 13.62 +19 21 08.5 d 151
2003-04-17 21:00:49 C 15 19 13.37 +19 21 09.4 d 151
2003-04-17 21:01:45 C 15 19 13.32 +19 21 09.2 d 151
2003-04-19 15:38:33 C 15 16 34.17 +19 27 34.5 355
2003-04-19 15:41:36 C 15 16 33.95 +19 27 35.3 355
2003-04-19 15:44:27 C 15 16 33.75 +19 27 35.7 355
2003-04-19 15:47:34 C 15 16 33.56 +19 27 36.2 355
2003-04-20 00:41:21 C 15 15 59.51 +19 28 47.7 c 084
2003-04-20 22:39:12 C 15 14 34.77 +19 31 38.2 c 084
2003-04-23 21:05:53 C 15 09 53.06 +19 38 55.6 c 240
2003-04-23 21:06:55 C 15 09 52.98 +19 38 55.7 c 240
2003-04-23 21:10:02 C 15 09 52.76 +19 38 55.9 c 240
2003-04-23 21:13:09 C 15 09 52.54 +19 38 56.2 c 240
2003-04-23 21:15:14 C 15 09 52.40 +19 38 56.3 c 240
2003-04-23 21:18:22 C 15 09 52.17 +19 38 56.5 c 240
2003-04-23 21:19:24 C 15 09 52.11 +19 38 56.6 c 240
2003-04-23 21:20:10 C 15 09 52.03 +19 38 56.7 15.6 c A31
2003-04-23 21:28:45 C 15 09 51.44 +19 38 57.4 15.4 c A31
2003-04-23 21:54:18 C 15 09 49.68 +19 38 59.7 15.4 c A31
2003-04-24 07:40:00 C 15 09 09.39 +19 39 47.4 c 704
2003-04-24 07:57:18 C 15 09 08.16 +19 39 49.0 c 704
2003-04-24 08:14:37 C 15 09 06.94 +19 39 50.5 c 704
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)