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
2021-07-18 05:57:40 C 13 12 59.62 +15 54 29.1 V T08
2021-07-18 06:05:23 C 13 12 59.76 +15 54 23.5 V T08
2021-07-18 06:21:42 C 13 13 00.05 +15 54 11.5 V T08
2021-07-18 06:31:11 C 13 13 00.22 +15 54 04.6 V T08
2021-07-20 06:02:25 C 13 13 55.15 +15 19 23.5 V T05
2021-07-20 06:07:44 C 13 13 55.25 +15 19 19.6 V T05
2021-07-20 06:15:43 C 13 13 55.40 +15 19 13.6 V T05
2021-07-20 06:32:56 C 13 13 55.74 +15 19 01.2 V T05
2021-07-24 06:42:48 C 13 15 59.95 +14 08 56.2 V T05
2021-07-24 06:47:26 C 13 16 00.06 +14 08 52.7 V T05
2021-07-24 06:52:42 C 13 16 00.17 +14 08 48.7 V T05
2021-07-24 06:56:00 C 13 16 00.25 +14 08 46.5 V T05
2021-07-24 06:57:20 C 13 16 00.28 +14 08 45.3 V T05
2021-07-24 07:05:14 C 13 16 00.46 +14 08 39.6 V T05
2021-07-24 07:19:45 C 13 16 00.79 +14 08 28.7 V T05
2021-08-01 06:40:36 C 13 20 56.70 +11 49 36.5 V T05
2021-08-01 06:45:54 C 13 20 56.86 +11 49 32.9 V T05
2021-08-01 06:56:30 C 13 20 57.15 +11 49 25.0 V T05
2021-08-01 07:11:40 C 13 20 57.58 +11 49 14.3 V T05
2021-08-03 06:33:28 C 13 22 20.29 +11 15 00.0 V T08
2021-08-03 06:40:06 C 13 22 20.46 +11 14 55.1 V T08
2021-08-03 06:48:04 C 13 22 20.69 +11 14 49.2 V T08
2021-08-03 07:03:20 C 13 22 21.16 +11 14 38.3 V T08
2021-08-05 06:14:59 C 13 23 47.12 +10 40 35.0 V T05
2021-08-05 06:20:55 C 13 23 47.30 +10 40 30.7 V T05
2021-08-05 06:29:29 C 13 23 47.55 +10 40 24.5 V T05
2021-08-05 06:44:40 C 13 23 48.02 +10 40 13.6 V T05
2021-08-07 06:18:15 C 13 25 18.16 +10 05 58.1 V T08
2021-08-07 06:23:35 C 13 25 18.33 +10 05 54.5 V T08
2021-08-07 06:32:13 C 13 25 18.60 +10 05 48.3 V T08
2021-08-07 06:46:49 C 13 25 19.07 +10 05 37.5 V T08
2021-08-09 12:38:10 C 13 27 05.29 +09 26 54.2 q D29
2021-08-09 12:47:26 C 13 27 05.59 +09 26 47.6 q D29
2021-08-09 12:56:43 C 13 27 05.90 +09 26 40.9 q D29
2021-08-16 05:48:23 C 13 32 48.06 +07 31 36.6 V T05
2021-08-16 05:52:59 C 13 32 48.23 +07 31 33.3 V T05
2021-08-16 06:04:12 C 13 32 48.64 +07 31 25.2 V T05
2021-08-16 06:22:01 C 13 32 49.30 +07 31 12.4 V T05
2021-08-22 05:45:44 C 13 38 23.78 +05 49 20.2 V T08
2021-08-22 05:51:02 C 13 38 23.98 +05 49 16.7 V T08
2021-08-22 05:59:01 C 13 38 24.33 +05 49 11.0 V T08
2021-08-22 06:13:36 C 13 38 24.89 +05 49 00.4 V T08
2022-10-01 11:30:15 C 10 29 03.008 +39 56 40.24 V 703
2022-10-01 11:36:05 C 10 29 03.613 +39 56 40.16 V 703
2022-10-01 11:41:56 C 10 29 04.232 +39 56 40.16 V 703
2022-10-01 11:47:46 C 10 29 04.816 +39 56 40.31 V 703
2022-10-17 14:29:02 C 11 07 44.215 +39 59 21.01 V T08
2022-10-17 14:43:08 C 11 07 45.590 +39 59 21.66 V T08
2022-10-17 14:48:29 C 11 07 46.070 +39 59 21.66 V T08
2022-10-17 15:11:22 C 11 07 48.269 +39 59 22.42 V T08
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)