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
2025-12-11 15:34:41 C 13 52 09.168 +29 14 29.47 V T05
2025-12-17 15:11:25 C 13 59 24.154 +29 22 55.27 V T05
2025-12-17 15:16:10 C 13 59 24.394 +29 22 55.67 V T05
2025-12-17 15:43:24 C 13 59 25.723 +29 22 57.94 V T05
2026-01-02 14:38:18 C 14 16 35.150 +30 17 26.09 V T08
2026-01-02 14:43:37 C 14 16 35.357 +30 17 26.88 V T08
2026-01-02 14:54:57 C 14 16 35.791 +30 17 29.18 V T08
2026-01-02 15:09:36 C 14 16 36.386 +30 17 32.39 V T08
2026-01-03 15:17:23 C 14 17 33.950 +30 22 34.14 X F51
2026-01-03 15:29:35 C 14 17 34.422 +30 22 36.77 X F51
2026-01-03 15:41:50 C 14 17 34.893 +30 22 39.38 X F51
2026-01-03 15:54:06 C 14 17 35.369 +30 22 42.04 X F51
2026-01-07 15:26:03 C 14 21 13.746 +30 44 31.34 X F52
2026-01-07 15:37:18 C 14 21 14.150 +30 44 34.17 X F52
2026-01-07 15:48:28 C 14 21 14.552 +30 44 36.91 X F52
2026-01-09 14:08:59 C 14 22 54.802 +30 56 17.66 V T05
2026-01-09 14:13:39 C 14 22 54.950 +30 56 18.82 V T05
2026-01-09 14:22:17 C 14 22 55.248 +30 56 21.23 V T05
2026-01-09 14:40:11 C 14 22 55.889 +30 56 25.69 V T05
2026-01-11 14:51:21 C 14 24 35.784 +31 09 20.52 V T05
2026-01-11 14:55:19 C 14 24 35.911 +31 09 21.74 V T05
2026-01-11 15:03:35 C 14 24 36.182 +31 09 24.01 V T05
2026-01-11 15:22:28 C 14 24 36.821 +31 09 29.41 V T05
2026-01-14 12:45:08 C 14 26 52.853 +31 29 26.05 V T08
2026-01-14 12:49:44 C 14 26 52.997 +31 29 27.82 V T08
2026-01-14 14:11:30 C 14 26 55.500 +31 29 52.48 V T08
2026-01-14 14:21:59 C 14 26 55.826 +31 29 55.57 V T08
2026-01-14 14:29:48 C 14 26 56.088 +31 29 58.02 V T08
2026-01-16 14:06:03 C 14 28 23.546 +31 44 36.06 V T05
2026-01-16 14:13:55 C 14 28 23.820 +31 44 38.69 V T05
2026-01-16 14:18:31 C 14 28 23.911 +31 44 40.06 V T05
2026-01-16 14:32:24 C 14 28 24.322 +31 44 44.38 V T05
2026-01-17 14:04:38 C 14 29 05.789 +31 52 15.35 V T05
2026-01-17 14:08:41 C 14 29 05.916 +31 52 16.36 V T05
2026-01-17 14:16:37 C 14 29 06.163 +31 52 19.27 V T05
2026-01-17 14:31:15 C 14 29 06.578 +31 52 24.17 V T05
2026-01-20 04:28:42 B 14 30 49.778 +32 13 00.73 V L65
2026-01-20 04:40:06 B 14 30 50.078 +32 13 04.62 V L65
2026-01-20 04:51:30 B 14 30 50.374 +32 13 08.54 V L65
2026-01-29 12:34:12 C 14 35 48.072 +33 37 30.65 V T05
2026-01-29 12:38:11 C 14 35 48.103 +33 37 32.74 V T05
2026-01-29 12:43:33 C 14 35 48.173 +33 37 34.28 V T05
2026-01-29 12:58:14 C 14 35 48.449 +33 37 40.76 V T05
2026-01-31 10:15:32 C 14 36 33.062 +33 56 29.54 V G96
2026-01-31 10:23:13 C 14 36 33.160 +33 56 32.75 V G96
2026-01-31 10:30:53 C 14 36 33.282 +33 56 36.10 V G96
2026-01-31 10:38:34 C 14 36 33.390 +33 56 39.37 V G96
2026-01-31 15:03:09 C 14 36 37.354 +33 58 32.05 V T08
2026-01-31 15:05:50 C 14 36 37.423 +33 58 33.56 V T08
2026-01-31 15:07:12 C 14 36 37.430 +33 58 33.92 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)