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
2026-01-31 15:09:51 C 14 36 37.469 +33 58 35.44 V T08
2026-01-31 15:11:15 C 14 36 37.476 +33 58 35.76 V T08
2026-01-31 15:34:51 C 14 36 37.800 +33 58 45.62 V T08
2026-02-01 13:06:05 C 14 36 56.923 +34 07 55.20 V T08
2026-02-01 13:10:02 C 14 36 56.957 +34 07 57.04 V T08
2026-02-01 13:33:30 C 14 36 57.266 +34 08 07.26 V T08
2026-02-01 13:35:28 C 14 36 57.310 +34 08 07.98 V T08
2026-02-01 13:38:45 C 14 36 57.322 +34 08 08.99 V T08
2026-02-01 13:41:23 C 14 36 57.384 +34 08 10.64 V T08
2026-02-01 13:56:02 C 14 36 57.562 +34 08 17.09 V T08
2026-02-01 14:04:39 C 14 36 57.670 +34 08 20.44 V T08
2026-02-02 12:38:03 C 14 37 16.186 +34 18 04.61 V T05
2026-02-02 12:42:41 C 14 37 16.214 +34 18 06.70 V T05
2026-02-02 12:49:57 C 14 37 16.332 +34 18 10.15 V T05
2026-02-02 12:57:14 C 14 37 16.409 +34 18 12.67 V T05
2026-02-04 13:23:36 C 14 37 50.954 +34 39 34.45 V T05
2026-02-04 13:27:33 C 14 37 50.995 +34 39 36.29 V T05
2026-02-04 13:41:46 C 14 37 51.127 +34 39 42.80 V T05
2026-02-04 13:49:09 C 14 37 51.218 +34 39 46.04 V T05
2026-02-05 11:34:06 C 14 38 04.435 +34 49 31.66 Z U76
2026-02-05 12:08:04 C 14 38 04.742 +34 49 47.21 Z U76
2026-02-05 12:42:26 C 14 38 05.045 +34 50 02.58 Z U76
2026-02-05 15:09:30 C 14 38 06.450 +34 51 10.28 X F51
2026-02-05 15:26:55 C 14 38 06.593 +34 51 18.20 X F51
2026-02-05 15:44:23 C 14 38 06.738 +34 51 26.11 X F51
2026-02-05 16:02:09 C 14 38 06.885 +34 51 34.19 X F51
2026-02-06 09:05:43 B 14 38 16.274 +34 59 18.42 X V46
2026-02-06 09:36:17 B 14 38 16.517 +34 59 32.50 X V46
2026-02-06 10:04:42 B 14 38 16.730 +34 59 45.56 X V46
2026-02-06 15:23:54 C 14 38 19.304 +35 02 12.94 X F51
2026-02-06 15:37:25 C 14 38 19.397 +35 02 19.17 X F51
2026-02-06 15:51:27 C 14 38 19.496 +35 02 25.59 X F51
2026-02-06 16:05:31 C 14 38 19.590 +35 02 32.04 X F51
2026-02-07 13:20:56 C 14 38 29.549 +35 12 19.30 V T08
2026-02-07 13:24:55 C 14 38 29.582 +35 12 21.49 V T08
2026-02-07 13:32:10 C 14 38 29.616 +35 12 24.70 V T08
2026-02-07 13:45:07 C 14 38 29.702 +35 12 30.82 V T08
2026-02-09 09:46:28 B 14 38 45.454 +35 33 05.58 Z V46
2026-02-09 10:15:02 B 14 38 45.562 +35 33 19.26 Z V46
2026-02-09 10:44:50 B 14 38 45.674 +35 33 33.37 Z V46
2026-02-10 03:40:59 B 14 38 50.119 +35 41 35.34 X J51
2026-02-10 03:57:25 B 14 38 50.148 +35 41 43.69 X J51
2026-02-10 04:13:25 B 14 38 50.196 +35 41 50.89 X J51
2026-02-11 09:48:13 B 14 38 55.571 +35 56 00.70 W V47
2026-02-11 09:53:16 B 14 38 55.578 +35 56 03.14 W V47
2026-02-11 09:58:19 B 14 38 55.586 +35 56 05.56 W V47
2026-02-11 10:03:21 B 14 38 55.593 +35 56 08.02 W V47
2026-02-11 10:08:23 B 14 38 55.595 +35 56 10.57 W V47
2026-02-12 08:30:24 B 14 38 57.805 +36 06 58.79 W V47
2026-02-12 08:35:26 B 14 38 57.796 +36 07 01.30 W V47
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)