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
1998-06-16 04:01:18 C 14 20 43.19 -13 17 49.1 z 682
1998-06-16 04:14:57 C 14 20 41.75 -13 18 00.9 z 682
1998-06-16 04:32:38 C 14 20 39.87 -13 18 16.3 z 682
1998-06-16 05:38:56 C 14 20 32.85 -13 19 12.4 16.9 a 704
1998-06-16 06:03:46 C 14 20 30.17 -13 19 33.6 a 704
1998-06-16 06:29:00 C 14 20 27.56 -13 19 54.8 a 704
1998-06-16 06:54:36 C 14 20 24.91 -13 20 16.4 a 704
1998-06-16 07:19:50 C 14 20 22.26 -13 20 37.9 a 704
1998-06-18 05:15:46 C 14 15 44.57 -14 00 06.2 16.8 a 704
1998-06-18 05:32:27 C 14 15 42.85 -14 00 21.4 a 704
1998-06-18 05:49:05 C 14 15 41.18 -14 00 34.7 a 704
1998-06-18 06:05:45 C 14 15 39.55 -14 00 49.4 a 704
1998-06-18 06:22:21 C 14 15 37.83 -14 01 03.3 a 704
1998-06-20 13:33:28 C 14 10 19.27 -14 48 35.5 m 347
1998-06-20 13:38:47 C 14 10 18.78 -14 48 40.3 m 347
1998-06-20 13:45:59 C 14 10 18.09 -14 48 46.3 m 347
1998-06-20 22:24:12 C 14 09 29.91 -14 56 13.3 14.8 z 148
1998-06-20 22:26:40 C 14 09 29.65 -14 56 15.3 14.9 z 148
1998-06-20 22:29:06 C 14 09 29.41 -14 56 17.5 14.9 z 148
1998-06-20 22:31:31 C 14 09 29.18 -14 56 20.0 14.9 z 148
1998-06-20 22:33:59 C 14 09 28.96 -14 56 21.8 14.8 z 148
1998-06-22 20:06:05 C 14 05 21.73 -15 35 36.2 z 610
1998-06-22 20:12:04 C 14 05 21.18 -15 35 41.5 z 610
1998-06-22 20:18:04 C 14 05 20.63 -15 35 46.8 z 610
1998-06-22 20:24:05 C 14 05 20.08 -15 35 52.1 z 610
1998-06-22 22:09:23 C 14 05 10.54 -15 37 24.4 z 491
1998-06-22 22:31:09 C 14 05 08.64 -15 37 41.8 z 491
1998-06-22 22:53:43 C 14 05 06.53 -15 38 00.9 z 491
1998-06-25 21:49:20 C 13 59 06.84 -16 39 06.8 z 491
1998-06-25 21:57:07 C 13 59 06.38 -16 39 14.2 z 491
1998-06-25 22:25:06 C 13 59 03.88 -16 39 37.0 z 491
1998-06-29 22:24:23 C 13 51 46.62 -18 02 06.3 z 491
1998-07-12 04:20:15 C 13 35 15.73 -22 13 25.3 z 670
1998-07-12 04:30:14 C 13 35 15.29 -22 13 33.8 z 670
1998-07-20 06:10:45 C 13 28 46.93 -24 59 23.5 o 566
1998-07-20 06:41:09 C 13 28 46.10 -24 59 49.7 o 566
1998-07-20 07:13:08 C 13 28 45.25 -25 00 16.9 o 566
1998-10-07 23:06:29 C 14 31 12.02 -58 44 39.9 z 844
1998-10-07 23:17:19 C 14 31 13.16 -58 44 54.0 z 844
1998-10-07 23:30:29 C 14 31 14.51 -58 45 11.4 z 844
1998-10-09 01:03:31 C 14 34 00.93 -59 19 17.8 z 844
1998-10-09 01:07:57 C 14 34 01.58 -59 19 24.2 z 844
1998-10-09 01:09:14 C 14 34 01.61 -59 19 25.6 z 844
1998-11-19 03:53:02 C 21 19 47.56 -65 40 21.8 a 844
1998-11-19 04:07:20 C 21 19 55.53 -65 39 30.4 a 844
1998-11-19 04:16:08 C 21 20 00.21 -65 39 00.6 a 844
1998-11-22 03:01:33 C 21 55 00.32 -60 59 55.6 a 844
1998-11-22 03:17:47 C 21 55 07.55 -60 58 42.7 a 844
1998-11-22 03:19:35 C 21 55 08.38 -60 58 34.5 a 844
1998-12-01 01:53:51 C 23 06 03.94 -40 26 19.9 l 689
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)