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
2025-02-28 19:51:09 B 02 41 47.518 +40 08 31.45 q Y84
2025-02-28 19:56:38 B 02 41 48.151 +40 08 36.20 q Y84
2025-02-28 20:08:37 C 02 41 49.514 +40 08 46.00 Z C23
2025-03-01 06:42:51 C 02 43 03.190 +40 18 07.81 V T05
2025-03-01 06:47:29 C 02 43 03.720 +40 18 11.81 V T05
2025-03-01 06:50:48 C 02 43 04.104 +40 18 14.72 V T05
2025-03-01 07:00:46 C 02 43 05.246 +40 18 23.18 V T05
2025-03-01 07:02:04 C 02 43 05.412 +40 18 24.44 V T05
2025-03-01 07:25:21 C 02 43 08.110 +40 18 44.50 V T05
2025-03-01 07:26:39 C 02 43 08.254 +40 18 45.50 V T05
2025-03-01 07:43:59 C 02 43 10.260 +40 19 00.48 V T05
2025-03-01 22:01:17 C 02 44 50.366 +40 31 24.24 Z C23
2025-03-01 22:22:28 C 02 44 52.872 +40 31 41.92 Z C23
2025-03-02 18:32:21 C 02 47 14.261 +40 49 01.27 Z C23
2025-03-02 19:55:24 C 02 47 23.918 +40 50 11.11 Z C23
2025-03-02 20:36:09 C 02 47 28.668 +40 50 45.24 Z C23
2025-03-03 06:02:16 C 02 48 34.870 +40 58 46.27 V T08
2025-03-03 06:15:40 C 02 48 36.427 +40 58 57.36 V T08
2025-03-03 06:42:15 C 02 48 39.511 +40 59 19.25 V T08
2025-03-03 06:55:37 C 02 48 41.066 +40 59 30.37 V T08
2025-03-04 18:40:09 C 02 52 53.234 +41 28 59.38 Z C23
2025-03-04 19:15:47 C 02 52 57.430 +41 29 28.82 Z C23
2025-03-04 19:48:57 C 02 53 01.282 +41 29 55.07 Z C23
2025-03-06 05:22:32 C 02 56 58.970 +41 56 47.04 V T08
2025-03-06 05:32:06 C 02 57 00.082 +41 56 54.49 V T08
2025-03-06 05:45:00 C 02 57 01.591 +41 57 04.43 V T08
2025-03-06 21:00:12 C 02 58 50.064 +42 08 55.39 Z C23
2025-03-06 21:26:27 C 02 58 53.172 +42 09 15.55 Z C23
2025-03-06 22:09:00 C 02 58 58.157 +42 09 47.92 Z C23
2025-03-07 05:22:12 C 02 59 49.620 +42 15 27.04 V T08
2025-03-07 05:26:51 C 02 59 50.160 +42 15 30.53 V T08
2025-03-07 05:37:28 C 02 59 51.410 +42 15 38.63 V T08
2025-03-07 05:52:10 C 02 59 53.138 +42 15 49.75 V T08
2025-03-07 18:48:16 C 03 01 25.505 +42 25 40.69 Z C23
2025-03-07 19:22:03 C 03 01 29.527 +42 26 06.07 Z C23
2025-03-07 20:24:19 C 03 01 36.900 +42 26 53.34 Z C23
2025-03-09 13:02:28 B 03 06 27.71 +42 57 10.4 Z O46
2025-03-09 13:20:53 B 03 06 29.95 +42 57 23.8 Z O46
2025-03-09 13:39:10 B 03 06 32.06 +42 57 36.7 Z O46
2025-03-09 13:57:25 B 03 06 34.27 +42 57 50.0 Z O46
2025-03-09 14:15:40 B 03 06 36.40 +42 58 02.9 Z O46
2025-03-09 14:33:35 B 03 06 38.56 +42 58 16.1 Z O46
2025-03-10 03:45:58 C 03 08 13.470 +43 07 51.31 V 703
2025-03-10 03:49:17 C 03 08 13.837 +43 07 53.47 V 703
2025-03-10 03:52:36 C 03 08 14.291 +43 07 55.56 V 703
2025-03-10 03:55:55 C 03 08 14.683 +43 07 57.94 V 703
2025-03-10 18:33:53 C 03 10 00.101 +43 18 25.42 Z C23
2025-03-10 18:55:23 C 03 10 02.798 +43 18 40.90 Z C23
2025-03-10 19:12:27 C 03 10 04.829 +43 18 52.92 Z C23
2025-03-11 03:23:24 C 03 11 03.728 +43 24 41.00 V 703
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)