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
2018-01-05 10:39:44 C 13 57 23.19 +38 12 37.9 U 703
2018-01-05 10:47:40 C 13 57 23.49 +38 12 40.5 U 703
2018-01-05 10:55:36 C 13 57 23.77 +38 12 43.7 U 703
2018-01-05 11:03:31 C 13 57 24.08 +38 12 46.5 U 703
2018-01-14 04:09:49 C 14 04 25.05 +39 36 52.6 U 160
2018-01-14 04:11:41 C 14 04 25.07 +39 36 53.7 U 160
2018-01-14 04:13:38 C 14 04 25.14 +39 36 54.2 U 160
2018-01-15 11:54:21 C 14 05 19.30 +39 50 55.9 U 703
2018-01-15 12:02:26 C 14 05 19.53 +39 50 59.6 U 703
2018-01-15 12:10:30 C 14 05 19.74 +39 51 03.1 U 703
2018-01-15 12:18:36 C 14 05 19.95 +39 51 07.2 U 703
2018-01-17 12:18:01 C 14 06 36.77 +40 12 57.1 U 703
2018-01-17 12:25:11 C 14 06 36.94 +40 13 00.5 U 703
2018-01-17 12:32:24 C 14 06 37.13 +40 13 04.4 U 703
2018-01-17 12:42:49 C 14 06 37.38 +40 13 08.5 U 703
2018-01-18 02:05:02 C 14 06 57.78 +40 19 19.9 d Z35
2018-01-18 02:20:16 C 14 06 58.14 +40 19 27.2 d Z35
2018-01-18 02:35:32 C 14 06 58.59 +40 19 34.5 d Z35
2018-01-22 10:05:33 C 14 09 17.39 +41 09 27.3 U 703
2018-01-22 10:13:25 C 14 09 17.57 +41 09 31.1 U 703
2018-01-22 10:21:17 C 14 09 17.74 +41 09 35.0 U 703
2018-01-22 10:29:09 C 14 09 17.88 +41 09 39.1 U 703
2018-01-25 09:44:23 C 14 10 34.42 +41 45 41.4 U 703
2018-01-25 09:52:27 C 14 10 34.55 +41 45 45.6 U 703
2018-01-25 09:59:36 C 14 10 34.65 +41 45 49.7 U 703
2018-01-25 10:06:46 C 14 10 34.75 +41 45 53.3 U 703
2018-01-25 10:32:34 C 14 10 35.15 +41 46 06.7 U G96
2018-01-25 10:39:19 C 14 10 35.25 +41 46 10.2 U G96
2018-01-25 10:46:01 C 14 10 35.36 +41 46 13.9 U G96
2018-01-25 10:52:45 C 14 10 35.47 +41 46 17.3 U G96
2018-01-28 09:24:45 C 14 11 34.81 +42 23 12.1 U 703
2018-01-28 09:32:34 C 14 11 34.93 +42 23 16.4 U 703
2018-01-28 09:40:22 C 14 11 35.00 +42 23 20.3 U 703
2018-01-30 15:30:33 C 14 12 08.74 +42 52 17.4 U T05
2018-01-30 15:43:35 C 14 12 08.87 +42 52 24.4 U T05
2018-01-30 15:56:31 C 14 12 08.96 +42 52 31.3 U T05
2018-01-30 16:09:14 C 14 12 09.07 +42 52 38.2 U T05
2018-02-04 09:26:26 C 14 12 46.54 +43 55 14.4 U 703
2018-02-04 09:34:12 C 14 12 46.54 +43 55 19.1 U 703
2018-02-04 09:42:00 C 14 12 46.57 +43 55 23.3 U 703
2018-02-04 09:49:46 C 14 12 46.57 +43 55 27.5 U 703
2018-02-04 20:44:48 C 14 12 47.45 +44 01 36.7 q D29
2018-02-04 21:07:43 C 14 12 47.45 +44 01 49.3 q D29
2018-02-04 21:30:37 C 14 12 47.45 +44 02 02.6 q D29
2018-02-07 09:34:15 C 14 12 45.02 +44 36 05.7 U 703
2018-02-07 09:41:59 C 14 12 44.97 +44 36 10.1 U 703
2018-02-07 09:49:44 C 14 12 44.93 +44 36 14.7 U 703
2018-02-07 09:57:28 C 14 12 44.91 +44 36 18.9 U 703
2018-02-08 09:49:39 C 14 12 39.83 +44 49 57.6 U G96
2018-02-08 09:57:10 C 14 12 39.79 +44 50 01.9 U G96
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)