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
2000-03-30 10:48:58 C 14 14 24.95 +41 17 54.6 c 695
2000-03-30 11:03:58 C 14 14 24.06 +41 17 58.4 c 695
2000-03-30 11:08:00 C 14 14 23.81 +41 17 59.5 c 695
2000-04-10 07:49:49 c 13 57 20.51 +42 03 29.4 c 699
2000-04-10 08:17:37 c 13 57 18.57 +42 03 32.2 c 699
2000-04-10 08:45:26 c 13 57 16.63 +42 03 34.3 c 699
2000-04-10 09:13:24 c 13 57 14.67 +42 03 36.7 c 699
2000-04-16 05:48:46 C 13 47 32.21 +42 07 19.1 17.6 c 704
2000-04-16 06:07:53 C 13 47 30.76 +42 07 18.9 17.6 c 704
2000-04-16 06:27:00 C 13 47 29.36 +42 07 20.6 17.7 c 704
2000-04-21 04:38:35 C 13 39 21.23 +41 58 40.1 i 739
2000-04-21 04:43:44 C 13 39 20.83 +41 58 39.0 i 739
2000-04-21 05:32:42 C 13 39 17.42 +41 58 33.2 i 739
2000-04-24 22:00:36 C 13 33 20.68 +41 45 03.0 17.4 d 145
2000-04-24 22:09:16 C 13 33 20.11 +41 45 01.6 17.3 d 145
2000-04-24 22:16:51 C 13 33 19.58 +41 45 00.0 17.4 d 145
2000-04-24 22:22:31 C 13 33 19.20 +41 44 59.1 17.4 d 145
2000-04-25 22:50:30 C 13 31 42.29 +41 40 13.7 610
2000-04-25 22:56:29 C 13 31 41.88 +41 40 12.5 610
2000-04-25 23:02:30 C 13 31 41.47 +41 40 11.4 610
2000-04-25 23:08:30 C 13 31 41.06 +41 40 10.2 610
2000-04-27 07:03:17 C 13 29 36.49 +41 33 18.0 17.6 c 704
2000-04-27 07:21:12 C 13 29 35.31 +41 33 13.7 17.7 c 704
2000-04-27 07:39:10 C 13 29 34.11 +41 33 09.9 17.6 c 704
2000-04-27 07:57:38 C 13 29 32.91 +41 33 05.4 17.4 c 704
2000-04-27 08:16:06 C 13 29 31.68 +41 33 01.0 17.6 c 704
2000-04-30 07:08:03 C 13 25 02.24 +41 15 05.0 c 704
2000-04-30 07:40:48 C 13 25 00.22 +41 14 55.4 c 704
2000-04-30 08:01:39 C 13 24 58.89 +41 14 49.7 c 704
2000-04-30 08:27:09 C 13 24 57.28 +41 14 42.4 c 704
2000-04-30 21:37:03 C 13 24 08.51 +41 10 58.5 610
2000-04-30 21:44:04 C 13 24 08.07 +41 10 56.3 610
2000-04-30 21:51:06 C 13 24 07.63 +41 10 54.1 610
2000-04-30 21:58:07 C 13 24 07.19 +41 10 51.9 610
2000-06-11 04:11:50 C 12 48 33.21 +32 27 49.8 17.6 c 704
2000-06-11 04:30:31 C 12 48 33.02 +32 27 36.5 17.7 c 704
2000-06-11 05:07:37 C 12 48 32.66 +32 27 11.9 17.5 c 704
2000-06-12 05:00:26 C 12 48 20.38 +32 11 03.3 17.1 c 704
2000-06-12 05:17:56 C 12 48 20.23 +32 10 51.2 17.1 c 704
2000-06-12 05:39:39 C 12 48 20.05 +32 10 36.3 17.4 c 704
2000-06-30 21:17:58 C 12 49 10.32 +26 59 27.9 493
2000-06-30 21:43:10 C 12 49 10.59 +26 59 09.6 493
2000-06-30 22:08:40 C 12 49 10.87 +26 58 51.9 493
2000-06-30 22:34:38 C 12 49 11.14 +26 58 33.5 493
2001-09-05 09:36:59 C 08 16 17.00 +34 18 33.6 c 846
2001-09-05 09:47:00 C 08 16 18.22 +34 18 38.1 c 846
2001-09-07 10:07:59 C 08 22 19.83 +34 40 04.2 c 846
2001-09-07 10:25:00 C 08 22 21.96 +34 40 11.6 c 846
2001-09-10 10:30:59 C 08 31 18.52 +35 10 59.1 c 846
2001-09-10 10:38:00 C 08 31 19.40 +35 11 01.9 c 846
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)