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
2026-03-04 12:52:18 C 14 32 23.062 +40 10 54.16 V T08
2026-03-04 13:04:13 C 14 32 22.704 +40 11 00.78 V T08
2026-03-04 23:50:14 B 14 32 03.850 +40 16 17.80 X Y84
2026-03-04 23:58:50 B 14 32 03.600 +40 16 22.04 X Y84
2026-03-05 00:07:18 B 14 32 03.343 +40 16 26.36 X Y84
2026-03-05 11:46:12 C 14 31 42.324 +40 22 13.33 V T08
2026-03-05 11:50:55 C 14 31 42.158 +40 22 15.78 V T08
2026-03-05 12:00:12 C 14 31 41.875 +40 22 20.35 V T08
2026-03-05 12:19:55 C 14 31 41.254 +40 22 30.25 V T08
2026-03-05 12:25:57 C 14 31 41.064 +40 22 33.13 V T08
2026-03-05 12:30:35 C 14 31 40.903 +40 22 35.29 V T08
2026-03-05 12:37:51 C 14 31 40.673 +40 22 39.04 V T08
2026-03-05 13:04:37 C 14 31 39.852 +40 22 52.25 V T08
2026-03-06 09:24:31 C 14 31 01.86 +40 32 48.6 o V18
2026-03-06 09:36:43 C 14 31 01.33 +40 32 55.0 o V18
2026-03-06 09:49:00 C 14 31 01.06 +40 33 01.0 o V18
2026-03-06 10:01:09 C 14 31 00.68 +40 33 06.0 o V18
2026-03-06 10:13:28 C 14 31 00.23 +40 33 12.4 o V18
2026-03-06 10:33:29 C 14 30 59.68 +40 33 21.5 o V18
2026-03-06 14:35:28 C 14 30 51.659 +40 35 21.75 X F51
2026-03-06 14:51:49 C 14 30 51.114 +40 35 29.66 X F51
2026-03-06 15:08:00 C 14 30 50.569 +40 35 37.52 X F51
2026-03-06 15:24:07 C 14 30 50.028 +40 35 45.25 X F51
2026-03-06 23:17:17 C 14 30 34.872 +40 39 32.54 W B67
2026-03-06 23:20:08 C 14 30 34.766 +40 39 33.77 W B67
2026-03-06 23:23:00 C 14 30 34.692 +40 39 35.60 W B67
2026-03-08 12:30:37 C 14 29 18.898 +40 57 31.57 V T08
2026-03-08 12:34:34 C 14 29 18.761 +40 57 33.41 V T08
2026-03-08 12:41:53 C 14 29 18.492 +40 57 37.04 V T08
2026-03-08 12:54:34 C 14 29 18.022 +40 57 43.06 V T08
2026-03-08 23:05:09 C 14 28 56.383 +41 02 31.02 Z C23
2026-03-08 23:51:34 C 14 28 54.710 +41 02 53.16 Z C23
2026-03-09 00:48:18 C 14 28 52.615 +41 03 20.81 Z C23
2026-03-10 11:57:53 C 14 27 34.164 +41 19 55.09 V T08
2026-03-10 12:05:08 C 14 27 33.869 +41 19 58.44 V T08
2026-03-10 12:09:46 C 14 27 33.689 +41 20 00.67 V T08
2026-03-10 12:24:26 C 14 27 33.118 +41 20 07.55 V T08
2026-03-10 13:47:20 C 14 27 29.805 +41 20 46.03 X F52
2026-03-10 14:03:30 C 14 27 29.164 +41 20 53.51 X F52
2026-03-10 14:19:40 C 14 27 28.516 +41 21 00.98 X F52
2026-03-14 00:22:45 B 14 24 05.95 +41 58 08.9 X L76
2026-03-14 00:29:17 B 14 24 05.64 +41 58 11.6 X L76
2026-03-14 00:35:48 B 14 24 05.35 +41 58 14.6 X L76
2026-03-14 00:42:19 B 14 24 05.07 +41 58 17.5 X L76
2026-03-14 00:48:51 B 14 24 04.76 +41 58 20.4 X L76
2026-03-20 00:15:24 B 14 17 09.566 +42 57 18.40 X Y84
2026-03-20 00:19:20 B 14 17 09.360 +42 57 19.87 X Y84
2026-03-20 00:23:15 B 14 17 09.154 +42 57 21.42 X Y84
2026-03-20 22:35:39 C 14 15 58.334 +43 05 39.16 Z C23
2026-03-20 22:53:27 B 14 15 57.406 +43 05 45.92 X Y84
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)