IAA RAS IAA Minor Planet Database

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
2020-01-16 14:14:23 S 05 38 08.938 +80 02 46.72 – V C57
2020-01-16 14:14:23 s 1 -180138.06 3 +329738.88 900.0 – C57
2020-01-16 14:44:23 S 05 38 00.914 +80 02 34.44 – V C57
2020-01-16 14:44:23 s 1 -180771.93 1 +328637.58 420.0 – C57
2020-01-16 15:14:23 S 05 37 52.980 +80 02 22.70 – V C57
2020-01-16 15:14:23 s 1 -181401.33 8 +327528.28 5630.0 – C57
2020-01-16 15:44:23 S 05 37 44.498 +80 02 09.92 – V C57
2020-01-16 15:44:23 s 1 -182026.24 5 +326410.98 6470.0 – C57
2020-01-16 16:14:23 S 05 37 36.818 +80 01 57.40 – V C57
2020-01-16 16:14:23 s 1 -182646.61 4 +325285.65 2880.0 – C57
2020-01-16 16:44:23 S 05 37 28.831 +80 01 45.44 – V C57
2020-01-16 16:44:23 s 1 -183262.40 4 +324152.29 4800.0 – C57
2020-01-16 17:14:23 S 05 37 20.904 +80 01 32.92 – V C57
2020-01-16 17:14:23 s 1 -183873.57 5 +323010.87 2170.0 – C57
2020-01-16 17:44:23 S 05 37 12.936 +80 01 21.04 – V C57
2020-01-16 17:44:23 s 1 -184480.08 7 +321861.38 4950.0 – C57
2020-01-16 18:14:23 S 05 37 04.966 +80 01 08.00 – V C57
2020-01-16 18:14:23 s 1 -185081.89 7 +320703.80 3060.0 – C57
2020-01-16 18:44:23 S 05 36 57.190 +80 00 55.62 – V C57
2020-01-16 18:44:23 s 1 -185678.96 4 +319538.12 6450.0 – C57
2020-01-16 19:14:23 S 05 36 49.114 +80 00 42.91 – V C57
2020-01-16 19:14:23 s 1 -186271.24 7 +318364.33 5060.0 – C57
2020-01-16 19:44:23 S 05 36 41.258 +80 00 30.46 – V C57
2020-01-16 19:44:23 s 1 -186858.70 2 +317182.40 8830.0 – C57
2020-01-16 20:14:23 S 05 36 33.538 +80 00 17.93 – V C57
2020-01-16 20:14:23 s 1 -187441.28 6 +315992.31 7690.0 – C57
2020-01-16 20:44:23 S 05 36 25.646 +80 00 05.51 – V C57
2020-01-16 20:44:23 s 1 -188018.95 5 +314794.06 1590.0 – C57
2020-01-16 21:14:23 S 05 36 17.623 +79 59 52.87 – V C57
2020-01-16 21:14:23 s 1 -188591.66 6 +313587.63 460.0 – C57
2020-01-16 21:44:23 S 05 36 09.919 +79 59 39.73 – V C57
2020-01-16 21:44:23 s 1 -189159.37 3 +312372.99 4240.0 – C57
2020-01-16 22:14:23 S 05 36 02.417 +79 59 27.74 – V C57
2020-01-16 22:14:23 s 1 -189722.03 2 +311150.13 2860.0 – C57
2020-01-16 22:44:23 S 05 35 54.353 +79 59 14.75 – V C57
2020-01-16 22:44:23 s 1 -190279.59 6 +309919.03 6260.0 – C57
2020-01-16 23:14:23 S 05 35 46.478 +79 59 01.90 – V C57
2020-01-16 23:14:23 s 1 -190832.02 0 +308679.68 4370.0 – C57
2020-01-17 00:14:23 S 05 35 31.217 +79 58 36.08 – V C57
2020-01-17 00:14:23 s 1 -191921.25 5 +306176.12 4450.0 – C57
2020-01-17 00:44:23 S 05 35 23.477 +79 58 23.74 – V C57
2020-01-17 00:44:23 s 1 -192457.97 2 +304911.89 6290.0 – C57
2020-01-17 01:14:23 S 05 35 15.631 +79 58 10.38 – V C57
2020-01-17 01:14:23 s 1 -192989.35 7 +303639.32 2580.0 – C57
2020-01-17 02:14:23 S 05 35 00.290 +79 57 45.22 – V C57
2020-01-17 02:14:23 s 1 -194035.93 2 +301069.11 8180.0 – C57
2020-01-17 02:44:23 S 05 34 52.565 +79 57 31.64 – V C57
2020-01-17 02:44:23 s 1 -194551.02 2 +299771.43 7350.0 – C57
2020-01-17 03:14:23 S 05 34 45.288 +79 57 18.76 – V C57
2020-01-17 03:14:23 s 1 -195060.57 8 +298465.35 690.0 – 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)