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
1999-04-01 20:10:38 C 04 47 29.10 +54 07 16.0 z 151
1999-04-01 20:15:56 C 04 47 29.88 +54 07 16.1 z 151
1999-04-01 20:21:26 C 04 47 30.47 +54 07 17.4 z 151
1999-04-06 03:00:50 C 05 00 54.21 +54 19 23.2 z 719
1999-04-06 04:11:15 C 05 01 03.37 +54 19 29.6 z 719
1999-04-09 02:50:55 C 05 10 18.78 +54 25 37.7 z 719
1999-04-09 04:17:45 C 05 10 30.10 +54 25 44.0 z 719
1999-04-25 20:06:19 C 06 02 55.88 +54 28 55.3 z 151
1999-04-25 20:14:27 C 06 02 56.92 +54 28 54.8 z 151
1999-04-25 20:22:20 C 06 02 57.90 +54 28 54.2 z 151
1999-05-06 20:41:17 C 06 37 03.68 +54 03 35.3 z 151
1999-05-06 20:49:26 C 06 37 04.76 +54 03 34.7 z 151
1999-05-06 20:56:13 C 06 37 05.74 +54 03 31.4 z 151
2000-01-29 11:24:27 C 14 42 53.15 +30 47 44.9 c 704
2000-01-29 11:45:34 C 14 42 53.57 +30 47 52.3 c 704
2000-01-29 12:06:40 C 14 42 53.99 +30 48 00.1 c 704
2000-01-29 12:27:41 C 14 42 54.36 +30 48 07.8 c 704
2000-01-29 12:49:00 C 14 42 54.77 +30 48 16.1 c 704
2000-02-27 10:07:20 C 14 45 00.15 +35 56 41.2 c 704
2000-02-27 10:26:36 C 14 44 59.89 +35 56 49.4 c 704
2000-02-27 10:45:50 C 14 44 59.59 +35 56 59.1 c 704
2000-02-27 11:05:28 C 14 44 59.23 +35 57 07.8 c 704
2000-02-27 11:25:00 C 14 44 58.82 +35 57 19.0 c 704
2000-03-17 09:09:35 C 14 31 09.37 +39 29 28.7 16.0 c 704
2000-03-17 09:29:26 C 14 31 08.46 +39 29 37.2 16.2 c 704
2000-03-17 09:50:38 C 14 31 07.52 +39 29 46.3 16.0 c 704
2000-03-17 10:09:17 C 14 31 06.64 +39 29 54.1 15.9 c 704
2000-03-17 10:28:24 C 14 31 05.75 +39 30 02.2 15.8 c 704
2000-03-18 07:31:31 C 14 30 08.68 +39 38 39.6 14.9 c 704
2000-03-18 07:50:15 C 14 30 07.75 +39 38 47.7 15.2 c 704
2000-03-18 08:08:28 C 14 30 06.91 +39 38 55.0 15.3 c 704
2000-03-18 08:27:29 C 14 30 06.04 +39 39 02.3 15.0 c 704
2000-03-18 08:46:05 C 14 30 05.13 +39 39 10.4 15.0 c 704
2000-03-27 08:11:31 C 14 18 51.41 +40 56 40.9 c 704
2000-03-27 08:43:01 C 14 18 49.57 +40 56 50.9 c 704
2000-03-27 09:04:04 C 14 18 48.34 +40 56 57.4 c 704
2000-03-27 09:25:24 C 14 18 47.09 +40 57 03.9 c 704
2000-03-27 09:46:37 C 14 18 45.84 +40 57 10.7 c 704
2000-03-29 10:21:56 C 14 15 53.88 +41 11 19.1 c 695
2000-03-29 10:27:19 C 14 15 53.57 +41 11 20.5 c 695
2000-03-29 10:59:09 C 14 15 51.62 +41 11 29.2 c 695
2000-03-29 11:08:37 C 14 15 51.02 +41 11 31.7 c 695
2000-03-29 11:22:50 C 14 15 50.16 +41 11 35.6 c 695
2000-03-29 11:31:28 C 14 15 49.63 +41 11 37.9 c 695
2000-03-29 11:40:33 C 14 15 49.07 +41 11 40.4 c 695
2000-03-29 11:49:55 C 14 15 48.49 +41 11 43.0 c 695
2000-03-29 12:02:26 C 14 15 47.73 +41 11 46.3 c 695
2000-03-29 12:15:22 C 14 15 46.94 +41 11 49.8 c 695
2000-03-29 12:24:13 C 14 15 46.40 +41 11 52.2 c 695
2000-03-30 10:44:28 C 14 14 25.27 +41 17 53.6 c 695
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)