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
2003-02-03 11:37:24 C 15 35 55.90 +12 31 23.1 c 699
2003-02-03 12:03:03 C 15 35 56.62 +12 31 25.5 c 699
2003-02-10 12:01:18 C 15 40 35.02 +12 51 56.0 c 704
2003-02-10 12:22:29 C 15 40 35.50 +12 51 58.6 c 704
2003-02-10 12:43:39 C 15 40 36.10 +12 52 02.2 c 704
2003-02-28 10:41:53 C 15 48 00.04 +14 13 48.1 c 704
2003-02-28 11:01:37 C 15 48 00.26 +14 13 53.1 c 704
2003-02-28 11:20:42 C 15 48 00.43 +14 13 57.7 c 704
2003-02-28 11:39:47 C 15 48 00.50 +14 14 02.9 c 704
2003-02-28 11:59:14 C 15 48 00.66 +14 14 08.7 c 704
2003-03-03 02:17:37 C 15 48 26.44 +14 29 11.1 c 084
2003-03-04 00:53:27 C 15 48 33.09 +14 34 49.7 c 084
2003-03-06 02:38:55 C 15 48 42.28 +14 47 34.6 c 084
2003-03-09 02:22:31 C 15 48 42.45 +15 06 38.7 c 084
2003-03-09 02:57:26 C 15 48 42.51 +15 06 48.6 d 170
2003-03-09 03:08:41 C 15 48 42.46 +15 06 52.0 d 170
2003-03-10 09:58:12 C 15 48 37.49 +15 15 17.8 c 699
2003-03-10 10:22:06 C 15 48 37.37 +15 15 24.3 c 699
2003-03-10 10:45:57 C 15 48 37.27 +15 15 31.0 c 699
2003-03-10 11:09:52 C 15 48 37.17 +15 15 37.7 c 699
2003-03-12 10:37:42 C 15 48 23.34 +15 28 50.4 m 333
2003-03-12 10:52:53 C 15 48 23.19 +15 28 55.0 m 333
2003-03-12 11:08:19 C 15 48 23.08 +15 28 59.3 m 333
2003-03-12 11:23:39 C 15 48 23.00 +15 29 04.1 m 333
2003-03-14 09:09:33 C 15 48 02.55 +15 42 02.9 c 704
2003-03-14 09:28:35 C 15 48 02.36 +15 42 09.0 c 704
2003-03-14 09:47:45 C 15 48 02.17 +15 42 14.5 c 704
2003-03-14 10:07:07 C 15 48 01.98 +15 42 20.5 c 704
2003-03-14 10:26:17 C 15 48 01.75 +15 42 26.2 c 704
2003-03-16 00:55:36 C 15 47 38.85 +15 53 29.6 c 204
2003-03-16 01:13:07 C 15 47 38.63 +15 53 34.6 c 204
2003-03-16 01:31:57 C 15 47 38.42 +15 53 40.0 c 204
2003-03-17 00:31:57 C 15 47 22.22 +16 00 21.4 c 198
2003-03-17 00:39:31 C 15 47 22.12 +16 00 23.6 c 198
2003-03-17 00:49:00 C 15 47 22.02 +16 00 26.5 c 198
2003-03-21 02:30:58 C 15 45 51.73 +16 29 12.8 c 084
2003-03-22 01:59:45 C 15 45 24.88 +16 36 10.9 c 084
2003-03-25 11:00:44 C 15 43 36.160 +17 00 19.63 g 689
2003-03-26 08:58:15 C 15 43 02.58 +17 06 50.7 c 704
2003-03-26 09:15:58 C 15 43 02.06 +17 06 56.1 c 704
2003-03-26 09:33:39 C 15 43 01.55 +17 07 01.4 c 704
2003-03-26 09:51:43 C 15 43 01.06 +17 07 07.0 c 704
2003-03-26 10:09:16 C 15 43 00.55 +17 07 12.2 c 704
2003-03-27 01:24:32 C 15 42 35.80 +17 11 41.9 c 084
2003-03-27 10:51:36 C 15 42 20.056 +17 14 30.38 g 689
2003-03-29 00:30:53 C 15 41 13.88 +17 25 33.4 c 084
2003-03-30 00:15:00 C 15 40 29.26 +17 32 28.2 c 084
2003-03-31 23:35:08 C 15 38 53.63 +17 46 06.4 c 198
2003-03-31 23:41:40 C 15 38 53.38 +17 46 08.0 c 198
2003-03-31 23:45:35 C 15 38 53.23 +17 46 09.0 c 198
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)