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
2024-12-20 11:35:19 B 23 09 35.59 -23 43 57.8 q Q73
2024-12-21 01:07:21 C 23 12 09.166 -22 49 51.42 V W68
2024-12-21 01:11:59 C 23 12 10.025 -22 49 32.92 V W68
2024-12-21 01:48:28 C 23 12 16.790 -22 47 06.47 V W68
2024-12-22 00:57:55 C 23 16 34.006 -21 14 26.95 V W68
2024-12-22 01:03:17 C 23 16 34.970 -21 14 05.32 V W68
2024-12-22 01:15:23 C 23 16 37.154 -21 13 16.79 V W68
2024-12-22 01:30:13 C 23 16 39.842 -21 12 17.17 V W68
2024-12-22 19:28:50 C 23 19 54.914 -20 00 24.44 V M22
2024-12-22 19:33:28 C 23 19 55.738 -20 00 05.80 V M22
2024-12-22 19:51:13 C 23 19 58.889 -19 58 54.66 V M22
2024-12-22 19:59:03 C 23 20 00.274 -19 58 23.12 V M22
2024-12-23 19:29:11 C 23 24 09.696 -18 24 38.74 V M22
2024-12-23 19:33:47 C 23 24 10.500 -18 24 20.52 V M22
2024-12-23 19:58:33 C 23 24 14.782 -18 22 41.41 V M22
2024-12-23 20:05:56 C 23 24 16.046 -18 22 12.04 V M22
2024-12-24 02:22:31 C 23 25 21.889 -17 57 27.76 V 703
2024-12-24 02:25:47 C 23 25 22.436 -17 57 15.01 V 703
2024-12-24 02:29:02 C 23 25 23.002 -17 57 02.05 V 703
2024-12-24 02:32:17 C 23 25 23.556 -17 56 49.06 V 703
2024-12-24 17:52:11 B 23 28 02.018 -16 55 59.74 V 160
2024-12-24 17:55:40 B 23 28 02.606 -16 55 45.88 V 160
2024-12-24 17:59:04 B 23 28 03.182 -16 55 32.23 V 160
2024-12-25 01:08:29 C 23 29 15.893 -16 26 57.84 V W68
2024-12-25 01:13:06 C 23 29 16.668 -16 26 39.55 V W68
2024-12-25 01:20:35 C 23 29 17.926 -16 26 09.89 V W68
2024-12-25 01:51:55 C 23 29 23.172 -16 24 05.65 V W68
2024-12-25 18:30:22 C 23 32 11.30 -15 18 43.5 V M14
2024-12-25 18:53:35 C 23 32 15.09 -15 17 12.1 V M14
2024-12-25 19:17:24 C 23 32 19.05 -15 15 38.6 V M14
2024-12-26 01:29:55 C 23 33 21.100 -14 51 13.64 V 703
2024-12-26 01:32:38 C 23 33 21.108 -14 50 49.16 V W68
2024-12-26 01:33:21 C 23 33 21.654 -14 51 00.22 V 703
2024-12-26 01:36:44 C 23 33 21.773 -14 50 33.07 V W68
2024-12-26 01:36:46 C 23 33 22.208 -14 50 46.72 V 703
2024-12-26 01:40:12 C 23 33 22.770 -14 50 33.32 V 703
2024-12-26 01:44:29 C 23 33 23.045 -14 50 02.47 V W68
2024-12-26 02:00:01 C 23 33 25.591 -14 49 01.49 V W68
2024-12-26 18:32:24 B 23 36 08.830 -13 44 35.16 V 160
2024-12-26 18:36:44 B 23 36 09.521 -13 44 18.13 V 160
2024-12-26 18:41:02 B 23 36 10.219 -13 44 01.21 V 160
2024-12-27 18:11:53 B 23 39 57.528 -12 12 47.63 V 160
2024-12-27 18:18:11 B 23 39 58.512 -12 12 23.22 V 160
2024-12-28 06:33:14 C 23 41 54.708 -11 25 10.67 V T05
2024-12-28 06:38:30 C 23 41 55.522 -11 24 50.36 V T05
2024-12-28 06:47:45 C 23 41 56.957 -11 24 14.72 V T05
2024-12-28 07:02:20 C 23 41 59.225 -11 23 18.67 V T05
2024-12-28 11:10:19 B 23 42 38.19 -11 07 17.0 q Q73
2024-12-28 11:15:29 B 23 42 38.99 -11 06 57.5 q Q73
2024-12-28 11:20:39 B 23 42 39.80 -11 06 37.5 q Q73
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)