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
2021-03-22 07:43:24 C 14 55 29.49 +31 45 15.9 V 703
2021-03-22 07:51:10 C 14 55 29.15 +31 45 19.0 V 703
2021-03-22 07:58:56 C 14 55 28.82 +31 45 22.1 V 703
2021-03-22 08:06:41 C 14 55 28.51 +31 45 25.3 V 703
2021-03-22 08:38:49 C 14 55 27.23 +31 45 37.8 U I41
2021-03-22 08:55:52 C 14 55 26.53 +31 45 44.6 U I41
2021-03-24 12:28:28 C 14 53 18.21 +32 05 41.7 V T08
2021-03-24 12:56:45 C 14 53 16.96 +32 05 52.5 V T08
2021-03-24 13:05:05 C 14 53 16.58 +32 05 55.7 V T08
2021-03-24 13:07:45 C 14 53 16.46 +32 05 56.6 V T08
2021-03-25 13:46:57 C 14 52 11.703 +32 15 11.55 U F52
2021-03-25 13:56:18 C 14 52 11.277 +32 15 14.95 U F52
2021-03-25 14:05:40 C 14 52 10.847 +32 15 18.37 U F52
2021-03-25 14:15:00 C 14 52 10.419 +32 15 21.88 U F52
2021-03-26 08:19:00 C 14 51 21.84 +32 22 00.0 V 703
2021-03-26 08:34:28 C 14 51 21.12 +32 22 05.8 V 703
2021-03-26 08:42:11 C 14 51 20.78 +32 22 08.6 V 703
2021-03-26 11:33:23 C 14 51 12.96 +32 23 11.5 V T05
2021-03-26 11:36:02 C 14 51 12.84 +32 23 12.8 V T05
2021-03-26 11:39:59 C 14 51 12.67 +32 23 14.4 V T05
2021-03-26 11:47:16 C 14 51 12.32 +32 23 16.7 V T05
2021-03-26 12:45:52 C 14 51 09.562 +32 23 38.30 U F52
2021-03-26 12:56:12 C 14 51 09.073 +32 23 42.06 U F52
2021-03-26 13:06:32 C 14 51 08.588 +32 23 45.81 U F52
2021-03-26 13:16:48 C 14 51 08.098 +32 23 49.50 U F52
2021-03-26 13:58:14 C 14 51 06.147 +32 24 04.53 U F51
2021-03-26 14:08:30 C 14 51 05.660 +32 24 08.19 U F51
2021-03-26 14:18:44 C 14 51 05.178 +32 24 11.89 U F51
2021-03-27 12:57:32 C 14 50 02.074 +32 32 19.97 U F51
2021-03-27 13:31:35 C 14 50 00.424 +32 32 32.14 U F51
2021-03-27 13:47:04 C 14 49 59.688 +32 32 37.48 U F51
2021-03-30 00:14:17 C 14 47 08.59 +32 52 40.2 V K87
2021-03-30 00:36:25 C 14 47 07.46 +32 52 48.0 V K87
2021-03-30 00:40:04 C 14 47 07.28 +32 52 49.8 Z L74
2021-03-30 01:07:00 C 14 47 05.87 +32 52 57.9 V K87
2021-03-30 01:47:30 C 14 47 03.81 +32 53 12.2 Z L74
2021-03-30 02:55:47 C 14 47 00.28 +32 53 34.7 Z L74
2021-03-30 10:47:55 C 14 46 36.57 +32 56 11.7 V T05
2021-03-30 10:54:08 C 14 46 36.24 +32 56 13.7 V T05
2021-03-30 11:00:09 C 14 46 35.92 +32 56 15.7 V T05
2021-03-30 11:14:44 C 14 46 35.17 +32 56 20.5 V T05
2021-03-31 09:50:14 C 14 45 25.08 +33 03 37.1 V 703
2021-03-31 09:57:27 C 14 45 24.69 +33 03 39.6 V 703
2021-03-31 10:04:39 C 14 45 24.31 +33 03 41.7 V 703
2021-03-31 10:11:50 C 14 45 23.92 +33 03 44.0 V 703
2021-03-31 18:53:27 C 14 44 56.81 +33 06 25.3 q K73
2021-03-31 19:02:16 C 14 44 56.48 +33 06 29.4 q K73
2021-03-31 19:07:56 C 14 44 56.07 +33 06 30.9 q K73
2021-03-31 19:13:43 C 14 44 55.81 +33 06 32.7 q K73
2021-04-01 07:53:54 C 14 44 15.39 +33 10 30.7 U I41
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)