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
2024-07-04 01:53:10 C 13 46 01.510 -09 34 32.88 V W68
2024-07-04 04:09:03 C 13 45 56.52 -09 36 36.5 q 463
2024-07-04 04:19:58 C 13 45 56.16 -09 36 45.9 q 463
2024-07-04 04:21:38 C 13 45 56.26 -09 36 47.1 q 463
2024-07-04 04:30:04 C 13 45 55.99 -09 36 54.8 q 463
2024-07-04 04:36:09 C 13 45 55.76 -09 36 58.7 q 463
2024-07-04 21:14:38 C 13 45 21.583 -09 51 03.13 Z C23
2024-07-04 21:20:00 C 13 45 21.406 -09 51 07.70 Z C23
2024-07-04 21:36:13 C 13 45 20.846 -09 51 21.20 Z C23
2024-07-05 07:38:09 C 13 45 00.804 -09 59 47.69 V T05
2024-07-05 07:47:16 C 13 45 00.518 -09 59 54.96 V T05
2024-07-05 08:02:16 C 13 44 59.981 -10 00 07.70 V T05
2024-07-05 18:24:11 C 13 44 40.104 -10 08 47.90 V M22
2024-07-05 18:28:44 C 13 44 39.953 -10 08 51.76 V M22
2024-07-05 18:37:38 C 13 44 39.653 -10 08 59.28 V M22
2024-07-05 19:00:04 C 13 44 38.899 -10 09 18.32 V M22
2024-07-06 00:54:25 B 13 44 27.60 -10 14 17.9 Z X86
2024-07-06 01:00:59 B 13 44 27.39 -10 14 23.4 Z X86
2024-07-06 01:07:34 B 13 44 27.17 -10 14 29.1 Z X86
2024-07-06 04:03:39 C 13 44 21.70 -10 17 07.8 q 463
2024-07-06 04:15:54 C 13 44 21.33 -10 17 18.1 q 463
2024-07-06 04:29:22 C 13 44 20.87 -10 17 29.4 q 463
2024-07-06 21:09:25 C 13 43 50.551 -10 31 37.67 Z C23
2024-07-06 21:32:13 C 13 43 49.843 -10 31 57.32 Z C23
2024-07-07 00:04:02 B 13 43 45.42 -10 33 56.2 Z X86
2024-07-07 00:18:07 B 13 43 44.98 -10 34 08.0 Z X86
2024-07-07 00:31:13 B 13 43 44.57 -10 34 19.5 Z X86
2024-07-07 01:55:22 C 13 43 42.086 -10 35 31.31 V W68
2024-07-07 01:59:59 C 13 43 41.940 -10 35 35.27 V W68
2024-07-07 02:10:47 C 13 43 41.609 -10 35 44.30 V W68
2024-07-07 02:26:04 C 13 43 41.141 -10 35 57.26 V W68
2024-07-07 06:03:31 C 13 43 34.987 -10 39 08.46 V T08
2024-07-07 06:08:19 C 13 43 34.838 -10 39 12.53 V T08
2024-07-07 06:15:48 C 13 43 34.610 -10 39 18.94 V T08
2024-07-07 06:43:18 C 13 43 33.756 -10 39 42.16 V T08
2024-07-08 00:42:02 C 13 43 03.377 -10 54 52.85 V W68
2024-07-08 00:47:15 C 13 43 03.221 -10 54 57.28 V W68
2024-07-08 00:56:23 C 13 43 02.952 -10 55 05.02 V W68
2024-07-08 01:20:40 C 13 43 02.246 -10 55 25.57 V W68
2024-07-08 19:48:08 B 13 42 32.705 -11 11 16.94 V 160
2024-07-08 19:54:14 B 13 42 32.470 -11 11 22.27 V 160
2024-07-09 04:26:25 C 13 42 19.38 -11 18 38.8 q 463
2024-07-09 04:37:43 C 13 42 19.07 -11 18 47.8 q 463
2024-07-09 04:47:34 C 13 42 18.78 -11 18 56.4 q 463
2024-07-09 07:05:00 C 13 42 15.341 -11 20 51.22 V T05
2024-07-09 07:09:41 C 13 42 15.221 -11 20 55.28 V T05
2024-07-09 07:18:49 C 13 42 14.964 -11 21 02.95 V T05
2024-07-09 07:44:49 C 13 42 14.280 -11 21 24.91 V T05
2024-07-10 04:09:41 C 13 41 44.63 -11 38 52.4 q 463
2024-07-10 04:19:19 C 13 41 44.38 -11 39 00.7 q 463
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)