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
2019-06-14 17:14:31 s 1 -169169.76 0 +323563.57 1710.0 C57
2019-06-14 17:44:31 S 19 59 25.824 -84 27 26.46 V C57
2019-06-14 17:44:31 s 1 -169827.38 3 +322425.63 8950.0 C57
2019-06-14 18:14:31 S 19 59 50.513 -84 29 35.74 V C57
2019-06-14 18:14:31 s 1 -170480.45 7 +321279.31 5230.0 C57
2019-06-14 18:44:31 S 20 00 15.924 -84 31 47.28 V C57
2019-06-14 18:44:31 s 1 -171128.93 9 +320124.61 380.0 C57
2019-06-14 19:14:31 S 20 00 41.870 -84 33 59.40 V C57
2019-06-14 19:14:31 s 1 -171772.78 9 +318961.51 4270.0 C57
2019-06-14 19:44:31 S 20 01 05.758 -84 35 59.60 V C57
2019-06-14 19:44:31 s 1 -172411.96 3 +317789.99 6740.0 C57
2019-06-14 20:14:31 S 20 01 34.109 -84 38 20.18 V C57
2019-06-14 20:14:31 s 1 -173046.41 8 +316610.03 7620.0 C57
2019-06-14 20:44:31 S 20 01 59.398 -84 40 24.42 V C57
2019-06-14 20:44:31 s 1 -173676.11 3 +315421.62 6780.0 C57
2019-06-16 21:04:45 C 21 56 10.51 -88 08 20.1 o K95
2019-06-16 21:53:40 C 22 01 07.50 -88 10 54.9 o K95
2019-06-18 01:29:38 C 02 53 55.92 -88 35 12.6 o K95
2019-06-18 01:33:16 C 02 54 33.04 -88 35 06.1 o K95
2019-06-18 01:36:55 C 02 55 10.42 -88 34 59.3 o K95
2019-06-18 01:40:36 C 02 55 47.14 -88 34 52.3 o K95
2019-06-20 12:14:30 S 06 12 26.064 -85 13 57.29 V C57
2019-06-20 12:14:30 s 1 +149419.64 5 +85682.715 6590.0 C57
2019-06-20 12:44:30 S 06 12 50.935 -85 12 06.37 V C57
2019-06-20 12:44:30 s 1 +149801.08 8 +88586.439 6570.0 C57
2019-06-20 13:14:30 S 06 13 12.598 -85 10 27.08 V C57
2019-06-20 13:14:30 s 1 +150152.41 7 +91472.421 4770.0 C57
2019-06-20 13:44:30 S 06 13 37.421 -85 08 32.32 V C57
2019-06-20 13:44:30 s 1 +150474.42 0 +94340.607 4230.0 C57
2019-06-20 14:14:30 S 06 13 59.532 -85 06 48.42 V C57
2019-06-20 14:14:30 s 1 +150767.86 0 +97190.958 7900.0 C57
2019-06-20 14:44:30 S 06 14 23.227 -85 04 56.21 V C57
2019-06-20 14:44:30 s 1 +151033.47 3 +100023.44 8620.0 C57
2019-06-20 15:14:30 S 06 14 46.301 -85 03 03.67 V C57
2019-06-20 15:14:30 s 1 +151271.97 2 +102838.04 9180.0 C57
2019-06-20 15:44:30 S 06 15 08.119 -85 01 17.87 V C57
2019-06-20 15:44:30 s 1 +151484.04 4 +105634.76 2250.0 C57
2019-06-20 20:14:30 S 06 18 13.222 -84 44 56.22 V C57
2019-06-20 20:14:30 s 1 +152306.45 0 +130003.38 7910.0 C57
2019-06-20 20:44:30 S 06 18 32.477 -84 43 06.89 V C57
2019-06-20 20:44:30 s 1 +152287.51 1 +132622.63 7240.0 C57
2019-06-20 21:14:30 S 06 18 51.094 -84 41 16.15 V C57
2019-06-20 21:14:30 s 1 +152248.39 2 +135224.40 3840.0 C57
2019-06-20 21:44:30 S 06 19 10.838 -84 39 19.84 V C57
2019-06-20 21:44:30 s 1 +152189.56 0 +137808.76 9580.0 C57
2019-06-20 22:14:30 S 06 19 28.238 -84 37 36.70 V C57
2019-06-20 22:14:30 s 1 +152111.46 5 +140375.79 6290.0 C57
2019-06-20 22:44:30 S 06 19 46.414 -84 35 48.44 V C57
2019-06-20 22:44:30 s 1 +152014.54 8 +142925.54 5760.0 C57
2019-06-20 23:14:30 S 06 20 04.022 -84 33 59.08 V C57
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)