Discovery[1] | |
---|---|
Discovered by | P. Wild |
Discovery site | Zimmerwald Obs. |
Discovery date | 5 December 1972 |
Designations | |
(1866) Sisyphus | |
Pronunciation | /ˈsɪsɪfəs/ |
Named after | Σίσυφος Sīsyphos (Greek mythology)[2] |
1972 XA | |
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) |
1.8936992 AU (283.29337 Gm) | |
Eccentricity | 0.5386 |
2.61 yr (952 days) | |
85.918° | |
0° 22m 41.88s / day | |
Inclination | 41.202° |
63.498° | |
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 | |
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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