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
2007-03-15 22:00:48 C 06 25 59.04 +70 04 01.8 c A24
2007-03-15 22:17:41 C 06 26 00.37 +70 03 52.6 c A24
2007-03-16 19:59:31 C 06 27 45.64 +69 52 06.0 c A24
2007-03-16 20:13:22 C 06 27 46.71 +69 51 58.2 c A24
2007-03-16 20:14:49 C 06 27 46.79 +69 51 57.4 c A24
2007-03-16 20:22:30 C 06 27 47.40 +69 51 53.4 c A24
2007-03-16 20:31:38 C 06 27 48.13 +69 51 48.1 c A24
2007-03-16 20:39:20 C 06 27 48.74 +69 51 44.0 c A24
2007-03-16 20:40:47 C 06 27 48.92 +69 51 43.0 c A24
2007-03-16 20:48:29 C 06 27 49.48 +69 51 38.8 c A24
2007-03-16 20:57:38 C 06 27 50.19 +69 51 33.7 c A24
2007-03-16 21:05:19 C 06 27 50.78 +69 51 29.3 c A24
2007-03-16 21:06:46 C 06 27 50.90 +69 51 28.7 c A24
2007-03-16 21:22:52 C 06 27 52.16 +69 51 19.7 c A24
2007-03-17 02:40:58 C 06 28 18.47 +69 48 28.6 o 699
2007-03-17 03:06:57 C 06 28 20.50 +69 48 14.9 o 699
2007-03-17 03:32:58 C 06 28 22.51 +69 48 01.2 o 699
2007-03-17 03:58:55 C 06 28 24.52 +69 47 46.5 o 699
2007-03-21 17:37:05 C 06 37 34.57 +68 48 31.6 r 168
2007-03-21 18:33:36 C 06 37 39.35 +68 48 00.7 r 168
2007-03-21 18:35:55 C 06 37 39.63 +68 47 59.2 r 168
2007-03-22 00:15:28 C 06 38 08.76 +68 44 53.8 r 168
2007-03-26 20:23:56 C 06 48 17.80 +67 42 44.1 o 084
2007-03-26 20:28:06 C 06 48 18.20 +67 42 41.7 o 084
2007-03-28 20:17:13 C 06 52 34.47 +67 17 12.4 o 084
2007-03-28 20:21:24 C 06 52 34.83 +67 17 09.8 o 084
2007-03-30 22:22:22 C 06 57 05.31 +66 50 32.4 o A32
2007-03-30 22:33:04 C 06 57 06.30 +66 50 26.7 o A32
2007-03-30 22:43:47 C 06 57 07.29 +66 50 20.5 o A32
2007-04-05 22:55:55 C 07 10 18.14 +65 33 46.9 o 084
2007-04-05 23:00:04 C 07 10 18.51 +65 33 44.7 o 084
2007-04-06 19:26:44 C 07 12 11.70 +65 22 57.3 c A24
2007-04-06 19:37:56 C 07 12 12.71 +65 22 51.1 c A24
2007-04-06 19:39:23 C 07 12 12.80 +65 22 50.5 c A24
2007-04-06 20:01:43 C 07 12 14.87 +65 22 38.3 c A24
2007-04-06 20:25:31 C 07 12 17.01 +65 22 25.5 c A24
2007-04-06 20:47:50 C 07 12 19.03 +65 22 13.4 c A24
2007-04-06 20:49:18 C 07 12 19.16 +65 22 12.6 c A24
2007-04-06 21:11:38 C 07 12 21.23 +65 22 00.6 c A24
2007-04-06 21:35:25 C 07 12 23.38 +65 21 47.8 c A24
2007-04-06 21:57:45 C 07 12 25.42 +65 21 35.8 c A24
2007-04-06 21:59:12 C 07 12 25.52 +65 21 35.0 c A24
2007-04-06 22:14:33 C 07 12 26.94 +65 21 26.7 c A24
2007-04-06 23:54:23 C 07 12 36.27 +65 20 32.0 o 084
2007-04-06 23:58:32 C 07 12 36.66 +65 20 29.7 o 084
2007-04-08 19:57:52 C 07 16 40.49 +64 57 13.2 c A24
2007-04-08 19:59:19 C 07 16 40.62 +64 57 12.5 c A24
2007-04-08 20:20:22 C 07 16 42.53 +64 57 01.1 c A24
2007-04-08 20:42:51 C 07 16 44.59 +64 56 49.1 c A24
2007-04-08 21:03:55 C 07 16 46.52 +64 56 37.6 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)