1866 Sisyphus

1866 Sisyphus /ˈsɪsɪfəs/ is a binary stony asteroid, near-Earth object and the largest member of the Apollo group, approximately 7 kilometers in diameter.

1866 Sisyphus
Discovery
Discovered byP. Wild
Discovery siteZimmerwald Obs.
Discovery date5 December 1972
Designations
MPC designation
(1866) Sisyphus
Pronunciation/ˈsɪsɪfəs/
Named after
Σίσυφος Sīsyphos (Greek mythology)
Alternative designations
1972 XA
Minor planet category
AdjectivesSysiphean /sɪsɪˈfiːən/, Sisyphian /sɪˈsɪfiən/
Orbital characteristics
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc61.55 yr (22,482 days)
Earliest precovery date26 January 1955
Aphelion2.913 AU (435.8 Gm)
Perihelion0.8747312 AU (130.85792 Gm)
Semi-major axis
1.8936992 AU (283.29337 Gm)
Eccentricity0.5386
Orbital period (sidereal)
2.61 yr (952 days)
Mean anomaly
85.918°
Mean motion
0° 22m 41.88s / day
Inclination41.202°
Longitude of ascending node
63.498°
293.09°
Known satellites1
(Orbital period of 27.16±0.05 h)
Earth MOID0.1045 AU (15.63 Gm)
Mars MOID0.1291 AU (19.31 Gm)
Physical characteristics
Dimensions
  • 5.72±0.07 km
  • 6.597±0.189 km
  • 6.859 km
  • 6.86 km (taken)
  • 8 km
  • 8.48 km
  • 8.9 km
Synodic rotation period
  • 2.3909±0.0004 h
  • 2.400 h
  • 2.4 h
  • 2.401±0.001 h
  • 2.424±0.001 h
  • 2.7 h
  • 0.14
  • 0.15
  • 0.19±0.07
  • 0.255±0.049
  • 0.360±0.010
  • 0.3719
  • 11.7±0.2 (R)
  • 12.4
  • 12.51±0.149
  • 13.0

    It was discovered on 5 December 1972, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, and given the provisional designation 1972 XA. It was named after Sisyphus from Greek mythology.

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