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
2016-06-06 02:10:57 C 13 50 21.93 +16 28 26.3 u H21
2016-06-06 02:12:55 C 13 50 21.85 +16 28 25.0 u H21
2016-06-06 02:14:52 C 13 50 21.75 +16 28 23.8 u H21
2016-06-06 02:16:50 C 13 50 21.66 +16 28 22.6 u H21
2016-06-06 02:18:48 C 13 50 21.56 +16 28 21.3 u H21
2016-06-06 02:20:45 C 13 50 21.47 +16 28 20.0 u H21
2016-06-06 02:22:43 C 13 50 21.37 +16 28 19.0 u H21
2016-06-06 02:24:41 C 13 50 21.28 +16 28 17.7 u H21
2016-06-06 02:26:38 C 13 50 21.19 +16 28 16.4 u H21
2016-06-06 02:28:36 C 13 50 21.08 +16 28 15.2 u H21
2016-06-06 02:30:33 C 13 50 20.99 +16 28 13.8 u H21
2016-06-06 02:32:31 C 13 50 20.89 +16 28 12.8 u H21
2016-06-06 02:35:39 C 13 50 20.74 +16 28 10.9 u H21
2016-06-06 21:08:47 C 13 49 28.28 +16 16 28.3 L04
2016-06-06 21:14:01 C 13 49 28.04 +16 16 24.9 L04
2016-06-06 21:18:35 C 13 49 27.81 +16 16 22.1 L04
2016-06-06 22:02:10 C 13 49 25.75 +16 15 54.8 q 160
2016-06-06 22:04:28 C 13 49 25.69 +16 15 53.4 q 160
2016-06-06 22:06:43 C 13 49 25.58 +16 15 52.0 q 160
2016-06-07 02:18:18 C 13 49 14.10 +16 13 12.6 u H21
2016-06-07 02:20:49 C 13 49 13.97 +16 13 11.1 u H21
2016-06-07 02:23:20 C 13 49 13.87 +16 13 09.5 u H21
2016-06-07 02:25:51 C 13 49 13.75 +16 13 07.9 u H21
2016-06-07 02:28:22 C 13 49 13.63 +16 13 06.4 u H21
2016-06-07 02:30:53 C 13 49 13.52 +16 13 04.7 u H21
2016-06-07 02:33:24 C 13 49 13.39 +16 13 03.2 u H21
2016-06-07 02:35:55 C 13 49 13.27 +16 13 01.5 u H21
2016-06-07 02:38:26 C 13 49 13.15 +16 13 00.0 u H21
2016-06-07 02:40:42 C 13 49 13.04 +16 12 58.6 u H21
2016-06-08 02:23:19 C 13 48 08.57 +15 57 47.3 u H21
2016-06-08 02:25:50 C 13 48 08.46 +15 57 45.6 u H21
2016-06-08 02:28:20 C 13 48 08.35 +15 57 44.0 u H21
2016-06-08 02:30:50 C 13 48 08.23 +15 57 42.4 u H21
2016-06-08 02:33:22 C 13 48 08.11 +15 57 40.8 u H21
2016-06-08 02:35:52 C 13 48 08.00 +15 57 39.2 u H21
2016-06-08 02:38:22 C 13 48 07.89 +15 57 37.5 u H21
2016-06-08 02:40:52 C 13 48 07.77 +15 57 36.0 u H21
2016-06-08 02:43:06 C 13 48 07.66 +15 57 34.4 u H21
2016-06-08 08:19:16 C 13 47 52.644 +15 53 58.64 L F51
2016-06-08 08:39:08 C 13 47 51.736 +15 53 45.64 L F51
2016-06-08 08:58:56 C 13 47 50.839 +15 53 32.86 L F51
2016-06-08 09:18:55 C 13 47 49.929 +15 53 19.83 L F51
2016-06-09 02:07:48 C 13 47 06.13 +15 42 21.7 u H21
2016-06-09 02:09:48 C 13 47 06.04 +15 42 20.4 u H21
2016-06-09 02:12:18 C 13 47 05.93 +15 42 18.8 u H21
2016-06-09 02:14:48 C 13 47 05.81 +15 42 17.2 u H21
2016-06-09 02:17:19 C 13 47 05.71 +15 42 15.6 u H21
2016-06-09 02:19:49 C 13 47 05.60 +15 42 13.9 u H21
2016-06-09 02:22:19 C 13 47 05.49 +15 42 12.3 u H21
2016-06-09 02:24:49 C 13 47 05.38 +15 42 10.6 u H21
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)