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
2007-01-24 16:43:05 C 06 56 07.70 +80 44 54.3 15.1 o 084
2007-01-25 03:34:37 C 06 53 06.82 +80 41 51.1 15.2 o 084
2007-01-25 03:36:46 C 06 53 06.33 +80 41 50.6 15.2 o 084
2007-01-25 16:59:12 C 06 49 35.92 +80 37 56.1 15.0 o 084
2007-01-25 17:01:22 C 06 49 35.42 +80 37 55.5 15.1 o 084
2007-01-26 04:44:50 C 06 46 32.59 +80 34 09.9 14.8 o 084
2007-01-26 04:46:59 C 06 46 31.98 +80 34 09.9 15.3 o 084
2007-01-26 18:49:04 C 06 43 05.90 +80 29 35.1 c A24
2007-01-26 18:50:35 C 06 43 05.55 +80 29 34.5 c A24
2007-01-26 19:13:35 C 06 42 59.83 +80 29 26.9 c A24
2007-01-26 19:36:34 C 06 42 54.12 +80 29 19.2 c A24
2007-01-26 19:56:56 C 06 42 49.05 +80 29 12.4 c A24
2007-01-26 19:59:36 C 06 42 48.26 +80 29 11.5 c A24
2007-01-26 20:01:05 C 06 42 47.91 +80 29 11.2 c A24
2007-01-26 20:18:10 C 06 42 43.77 +80 29 05.3 c A24
2007-01-26 20:21:23 C 06 42 42.85 +80 29 04.3 c A24
2007-01-26 21:02:00 C 06 42 32.69 +80 28 50.6 c A24
2007-01-26 21:03:29 C 06 42 32.32 +80 28 50.0 c A24
2007-01-27 19:02:39 C 06 37 24.79 +80 20 55.1 c A24
2007-01-27 19:04:06 C 06 37 24.49 +80 20 54.6 c A24
2007-01-27 19:37:07 C 06 37 16.81 +80 20 42.4 c A24
2007-01-27 20:43:12 C 06 37 01.23 +80 20 18.5 c A24
2007-01-27 20:44:38 C 06 37 01.03 +80 20 17.6 c A24
2007-01-27 22:42:16 C 06 36 33.55 +80 19 33.2 c A24
2007-01-27 22:43:42 C 06 36 33.30 +80 19 32.9 c A24
2007-01-27 23:15:02 C 06 36 26.14 +80 19 20.5 c A24
2007-01-27 23:46:50 C 06 36 18.85 +80 19 08.6 c A24
2007-01-28 00:17:40 C 06 36 11.62 +80 18 56.5 c A24
2007-01-28 00:19:08 C 06 36 11.32 +80 18 55.8 c A24
2007-01-28 18:24:52 C 06 32 19.24 +80 11 52.5 c A24
2007-01-28 18:26:19 C 06 32 18.94 +80 11 51.9 c A24
2007-01-28 18:39:02 C 06 32 16.21 +80 11 47.0 c A24
2007-01-28 18:53:19 C 06 32 13.13 +80 11 41.5 c A24
2007-01-28 19:05:54 C 06 32 10.28 +80 11 36.2 c A24
2007-01-28 19:21:46 C 06 32 06.94 +80 11 30.6 c A24
2007-01-28 19:48:46 C 06 32 01.07 +80 11 19.8 c A24
2007-01-28 19:50:13 C 06 32 00.76 +80 11 19.2 c A24
2007-01-30 20:21:23 C 06 22 39.01 +79 50 39.0 15.8 o 084
2007-01-30 20:23:32 C 06 22 38.55 +79 50 37.8 15.7 o 084
2007-01-31 04:40:23 C 06 21 11.54 +79 46 47.8 15.8 o 084
2007-01-31 04:42:32 C 06 21 11.21 +79 46 46.8 15.8 o 084
2007-01-31 19:51:47 C 06 18 40.81 +79 39 53.0 15.6 o 084
2007-01-31 19:53:55 C 06 18 40.39 +79 39 51.9 15.7 o 084
2007-02-01 01:28:46 C 06 17 45.96 +79 37 11.9 15.9 o 084
2007-02-01 01:30:55 C 06 17 45.69 +79 37 10.2 15.6 o 084
2007-02-01 23:43:47 C 06 14 24.13 +79 26 32.9 15.8 o 084
2007-02-01 23:45:58 C 06 14 23.82 +79 26 32.0 15.8 o 084
2007-02-03 19:05:07 C 06 08 43.08 +79 04 54.7 c A24
2007-02-04 21:23:36 C 06 05 44.39 +78 51 15.7 c A24
2007-02-04 21:25:03 C 06 05 44.16 +78 51 15.1 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)