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
2020-04-09 22:05:12 C 06 57 35.45 +63 34 41.3 q K73
2020-04-09 22:11:21 C 06 57 36.26 +63 34 37.7 q K73
2020-04-10 03:27:15 C 06 58 09.43 +63 32 15.0 V 703
2020-04-10 03:34:57 C 06 58 10.26 +63 32 11.4 V 703
2020-04-10 03:42:39 C 06 58 11.06 +63 32 08.0 V 703
2020-04-10 03:50:21 C 06 58 11.92 +63 32 05.2 V 703
2020-04-11 05:39:02 C 07 00 54.25 +63 20 12.0 V T08
2020-04-11 05:44:30 C 07 00 54.81 +63 20 09.5 V T08
2020-04-11 05:53:52 C 07 00 55.75 +63 20 05.2 V T08
2020-04-11 06:08:02 C 07 00 57.20 +63 19 58.5 V T08
2020-04-15 03:28:04 C 07 10 42.00 +62 36 43.7 V 703
2020-04-15 03:35:49 C 07 10 42.81 +62 36 39.5 V 703
2020-04-15 03:43:34 C 07 10 43.57 +62 36 35.2 V 703
2020-04-15 03:51:20 C 07 10 44.27 +62 36 31.8 V 703
2020-04-15 03:58:58 C 07 10 45.11 +62 36 28.6 V 703
2020-04-15 03:59:12 C 07 10 45.29 +62 36 28.5 U I41
2020-04-15 04:06:43 C 07 10 46.06 +62 36 24.2 V 703
2020-04-15 04:14:28 C 07 10 46.90 +62 36 18.9 V 703
2020-04-15 04:22:14 C 07 10 47.74 +62 36 15.6 V 703
2020-04-15 05:14:43 C 07 10 53.05 +62 35 52.6 U I41
2020-04-15 11:37:52 C 07 11 33.06 +62 32 55.3 q D29
2020-04-15 12:13:25 C 07 11 36.69 +62 32 38.4 q D29
2020-04-15 19:28:17 C 07 12 21.98 +62 29 15.1 V 130
2020-04-15 19:30:26 C 07 12 22.24 +62 29 14.3 V 130
2020-04-15 19:32:35 C 07 12 22.44 +62 29 12.9 V 130
2020-04-15 19:34:44 C 07 12 22.62 +62 29 12.0 V 130
2020-04-16 03:48:35 C 07 13 13.95 +62 25 22.4 q U76
2020-04-16 04:08:54 C 07 13 16.04 +62 25 12.7 q U76
2020-04-16 04:30:00 C 07 13 18.20 +62 25 02.7 q U76
2020-04-16 05:16:28 C 07 13 22.99 +62 24 40.4 U I41
2020-04-16 05:17:51 C 07 13 23.14 +62 24 39.8 U I41
2020-04-17 07:19:23 C 07 16 05.22 +62 12 30.9 V T05
2020-04-17 07:24:27 C 07 16 05.73 +62 12 28.5 V T05
2020-04-17 07:34:05 C 07 16 06.70 +62 12 23.8 V T05
2020-04-17 07:49:39 C 07 16 08.28 +62 12 16.1 V T05
2020-04-17 13:35:55 C 07 16 44.25 +62 09 33.7 q D29
2020-04-17 13:45:58 C 07 16 45.28 +62 09 29.0 q D29
2020-04-17 13:56:00 C 07 16 46.29 +62 09 24.1 q D29
2020-04-18 04:13:28 C 07 18 15.13 +62 02 42.8 V 703
2020-04-18 04:21:44 C 07 18 16.17 +62 02 38.4 V 703
2020-04-18 04:30:01 C 07 18 17.07 +62 02 32.3 V 703
2020-04-18 04:38:20 C 07 18 17.98 +62 02 29.3 V 703
2020-04-19 05:43:15 C 07 20 53.55 +61 50 45.2 V T08
2020-04-19 06:00:21 C 07 20 55.24 +61 50 36.9 V T08
2020-04-19 06:10:52 C 07 20 56.29 +61 50 31.9 V T08
2020-04-19 06:16:03 C 07 20 56.84 +61 50 29.4 V T08
2020-04-19 06:26:26 C 07 20 57.89 +61 50 24.5 V T08
2020-04-19 06:41:00 C 07 20 59.36 +61 50 17.6 V T08
2020-04-21 05:40:28 C 07 25 50.03 +61 28 08.1 V T05
2020-04-21 05:45:07 C 07 25 50.56 +61 28 05.7 V T05
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)