Global Information1866 Sisyphus information
| Discovery[1] | |
|---|---|
| Discovered by | P. Wild |
| Discovery site | Zimmerwald Obs. |
| Discovery date | 5 December 1972 |
| Designations | |
MPC designation | (1866) Sisyphus |
| Pronunciation | /ˈsɪsɪfəs/ |
Named after | Σίσυφος Sīsyphos (Greek mythology)[2] |
Alternative designations | 1972 XA |
Minor planet category |
|
| Adjectives | Sysiphean /sɪsɪˈfiːən/,[4] Sisyphian /sɪˈsɪfiən/[5] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 61.55 yr (22,482 days) |
| Earliest precovery date | 26 January 1955 |
| Aphelion | 2.913 AU (435.8 Gm) |
| Perihelion | 0.8747312 AU (130.85792 Gm) |
Semi-major axis | 1.8936992 AU (283.29337 Gm) |
| Eccentricity | 0.5386 |
Orbital period (sidereal) | 2.61 yr (952 days) |
Mean anomaly | 85.918° |
Mean motion | 0° 22m 41.88s / day |
| Inclination | 41.202° |
Longitude of ascending node | 63.498° |
Argument of perihelion | 293.09° |
| Known satellites | 1[a][6][7][8] (Orbital period of 27.16±0.05 h) |
| Earth MOID | 0.1045 AU (15.63 Gm) |
| Mars MOID | 0.1291 AU (19.31 Gm) |
| Physical characteristics | |
| Dimensions |
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Synodic rotation period |
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Geometric albedo |
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Spectral type |
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Absolute magnitude (H) |
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1866 Sisyphus /ˈsɪsɪfəs/ is a binary[8] stony asteroid, near-Earth object and the largest member of the Apollo group, approximately 7 kilometers in diameter.
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.[3][20]
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