|Discovered by||Robert Luther|
|Discovery date||February 20, 1890|
|1955 MO; 1959 GB; 1961 WF|
|Epoch October 22, 2004 (JD 2453300.5)|
|Aphelion||499.173 Gm (3.337 AU)|
|Perihelion||325.456 Gm (2.176 AU)|
|412.314 Gm (2.756 AU)|
|1671.295 d (4.58 a)|
Average orbital speed
|Dimensions||32.2 ± 2.2 km (IRAS)|
|Mass||3.5×1016 kg (assumed)|
|2.0 ? g/cm³|
|1200 hr (50 d)|
288 Glauke (// GLAW-kee) is an asteroid from the asteroid belt discovered by Robert Luther in 1890. It was the last of his asteroid discoveries. It is named after Glauke, a daughter of Creon a king of Corinth in Greek mythology.
Glauke has an exceptionally slow rotation period of about 1200 hours (50 days). This makes it the slowest-rotating non-planetary object known in the Solar System (both Mercury and Venus rotate more slowly). The rotation is believed to be "tumbling", similar to 4179 Toutatis.
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