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
2021-04-01 08:21:18 C 14 44 13.90 +33 10 39.3 U I41
2021-04-01 08:22:38 C 14 44 13.82 +33 10 39.7 U I41
2021-04-01 09:22:52 C 14 44 10.54 +33 10 58.3 U I41
2021-04-01 10:26:23 C 14 44 07.27 +33 11 18.7 V T08
2021-04-01 10:29:42 C 14 44 07.09 +33 11 19.8 V T08
2021-04-01 10:34:21 C 14 44 06.83 +33 11 21.0 V T08
2021-04-01 11:25:17 C 14 44 04.04 +33 11 37.0 V T08
2021-04-03 09:21:24 C 14 41 33.26 +33 25 09.5 V 703
2021-04-03 09:28:56 C 14 41 32.83 +33 25 11.7 V 703
2021-04-03 09:36:27 C 14 41 32.40 +33 25 13.6 V 703
2021-04-03 09:44:00 C 14 41 31.97 +33 25 15.9 V 703
2021-04-05 11:12:43 C 14 38 42.88 +33 38 41.2 V T08
2021-04-05 11:18:04 C 14 38 42.58 +33 38 42.5 V T08
2021-04-05 11:35:34 C 14 38 41.52 +33 38 47.1 V T08
2021-04-05 11:40:57 C 14 38 41.21 +33 38 48.5 V T08
2021-04-06 12:25:27 C 14 37 13.98 +33 45 00.8 V T08
2021-04-06 12:54:15 C 14 37 12.24 +33 45 07.7 V T08
2021-04-06 12:57:51 C 14 37 12.02 +33 45 08.6 V T08
2021-04-06 13:03:09 C 14 37 11.70 +33 45 09.9 V T08
2021-04-08 09:32:17 C 14 34 31.14 +33 55 24.8 V 703
2021-04-08 09:39:57 C 14 34 30.56 +33 55 26.1 V 703
2021-04-08 09:50:09 C 14 34 29.92 +33 55 28.4 V 703
2021-04-08 09:57:44 C 14 34 29.44 +33 55 29.9 V 703
2021-04-09 12:08:53 C 14 32 52.67 +34 00 59.9 V T08
2021-04-09 12:14:25 C 14 32 52.32 +34 01 01.1 V T08
2021-04-09 12:22:35 C 14 32 51.80 +34 01 02.7 V T08
2021-04-09 13:13:42 C 14 32 48.55 +34 01 12.8 V T08
2021-04-10 10:52:03 C 14 31 27.53 +34 05 24.8 V T08
2021-04-10 10:58:03 C 14 31 27.14 +34 05 25.8 V T08
2021-04-10 11:02:02 C 14 31 26.89 +34 05 26.6 V T08
2021-04-10 11:12:39 C 14 31 26.21 +34 05 28.5 V T08
2021-04-12 05:14:46 C 14 28 45.71 +34 12 44.6 V H23
2021-04-12 05:22:49 C 14 28 45.35 +34 12 45.1 Z U76
2021-04-12 05:28:56 C 14 28 44.95 +34 12 46.3 Z U76
2021-04-12 05:38:05 C 14 28 44.32 +34 12 47.6 Z U76
2021-04-12 05:42:12 C 14 28 43.90 +34 12 49.0 V H23
2021-04-12 06:08:55 C 14 28 42.15 +34 12 53.3 V H23
2021-04-13 08:37:14 C 14 26 59.25 +34 16 51.5 V 703
2021-04-13 08:44:46 C 14 26 58.75 +34 16 52.5 V 703
2021-04-13 08:52:17 C 14 26 58.25 +34 16 53.5 V 703
2021-04-13 08:59:49 C 14 26 57.75 +34 16 54.6 V 703
2021-04-14 20:28:38 C 14 24 38.32 +34 21 27.4 V K73
2021-04-14 20:33:12 C 14 24 38.00 +34 21 28.0 V K73
2021-04-14 20:37:45 C 14 24 37.67 +34 21 28.6 V K73
2021-04-14 20:42:12 C 14 24 37.40 +34 21 29.3 V K73
2021-04-14 20:46:39 C 14 24 37.12 +34 21 29.6 V K73
2021-04-14 20:51:06 C 14 24 36.82 +34 21 30.2 V K73
2021-04-15 07:57:20 C 14 23 52.52 +34 22 46.2 V G96
2021-04-15 08:07:18 C 14 23 51.85 +34 22 47.4 V G96
2021-04-15 08:17:15 C 14 23 51.18 +34 22 48.4 V 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)