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
2025-02-19 03:18:34 C 02 15 09.137 +36 18 38.05 V 703
2025-02-19 03:21:39 C 02 15 09.486 +36 18 41.47 V 703
2025-02-19 05:25:33 C 02 15 23.534 +36 20 59.42 V T08
2025-02-19 05:30:59 C 02 15 24.146 +36 21 05.44 V T08
2025-02-19 05:39:36 C 02 15 25.106 +36 21 14.69 V T08
2025-02-19 06:09:41 C 02 15 28.454 +36 21 47.38 V T08
2025-02-20 06:04:00 C 02 18 10.843 +36 47 43.30 V T05
2025-02-20 06:08:34 C 02 18 11.350 +36 47 48.19 V T05
2025-02-20 06:16:31 C 02 18 12.242 +36 47 56.62 V T05
2025-02-20 06:41:35 C 02 18 15.034 +36 48 23.18 V T05
2025-02-21 05:40:57 C 02 20 51.662 +37 12 46.69 V T08
2025-02-21 05:44:59 C 02 20 52.106 +37 12 50.83 V T08
2025-02-21 05:59:04 C 02 20 53.690 +37 13 05.48 V T08
2025-02-21 06:14:29 C 02 20 55.421 +37 13 21.40 V T08
2025-02-21 18:21:05 B 02 22 18.11 +37 25 55.7 X L76
2025-02-21 18:26:38 B 02 22 18.74 +37 26 01.4 X L76
2025-02-21 18:31:38 B 02 22 19.30 +37 26 06.5 X L76
2025-02-23 02:55:58 C 02 26 00.967 +37 59 13.81 V 703
2025-02-23 02:59:20 C 02 26 01.356 +37 59 17.20 V 703
2025-02-23 03:02:42 C 02 26 01.730 +37 59 20.51 V 703
2025-02-23 03:06:04 C 02 26 02.112 +37 59 23.93 V 703
2025-02-23 05:21:56 C 02 26 17.650 +38 01 42.06 V T08
2025-02-23 05:26:38 C 02 26 18.187 +38 01 46.78 V T08
2025-02-23 05:35:59 C 02 26 19.246 +38 01 56.03 V T08
2025-02-23 05:57:29 C 02 26 21.665 +38 02 17.30 V T08
2025-02-24 02:39:25 C 02 28 43.817 +38 22 49.76 V V00
2025-02-24 02:47:29 C 02 28 44.728 +38 22 57.61 V V00
2025-02-24 02:55:35 C 02 28 45.646 +38 23 05.42 V V00
2025-02-24 03:03:40 C 02 28 46.560 +38 23 13.34 V V00
2025-02-24 20:19:02 C 02 30 45.343 +38 40 01.20 Z C23
2025-02-24 20:34:27 C 02 30 47.100 +38 40 15.89 Z C23
2025-02-24 20:58:06 C 02 30 49.764 +38 40 38.17 Z C23
2025-02-25 03:38:44 C 02 31 35.742 +38 47 06.97 V 703
2025-02-25 03:41:56 C 02 31 36.116 +38 47 10.07 V 703
2025-02-25 03:45:08 C 02 31 36.469 +38 47 13.09 V 703
2025-02-25 03:48:20 C 02 31 36.847 +38 47 16.15 V 703
2025-02-25 05:41:56 C 02 31 49.949 +38 49 07.00 V T05
2025-02-25 05:46:31 C 02 31 50.467 +38 49 11.28 V T05
2025-02-25 06:09:03 C 02 31 53.021 +38 49 32.66 V T05
2025-02-25 06:32:58 C 02 31 55.752 +38 49 55.27 V T05
2025-02-27 03:12:00 C 02 37 04.472 +39 31 49.40 V 703
2025-02-27 03:19:00 C 02 37 05.448 +39 31 56.24 V 703
2025-02-27 03:22:29 C 02 37 05.815 +39 31 59.34 V 703
2025-02-28 06:05:07 C 02 40 11.470 +39 56 17.05 V T05
2025-02-28 06:19:45 C 02 40 13.147 +39 56 29.98 V T05
2025-02-28 06:25:45 C 02 40 13.843 +39 56 35.34 V T05
2025-02-28 06:34:55 C 02 40 14.897 +39 56 43.44 V T05
2025-02-28 18:52:43 C 02 41 40.759 +40 07 39.54 Z C23
2025-02-28 19:31:14 C 02 41 45.204 +40 08 13.27 Z C23
2025-02-28 19:45:35 B 02 41 46.872 +40 08 26.45 q 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)