Friday 30 September 2016

Astrognome Scrapbook Themisto


Themisto also known as Jupiter XVIII is a small irregular satellite of Jupiter was discovered on September 30th 1975, the subsequently lost, and rediscovered in 2000.

Themisto seen moving against starry background

Themisto was first discovered by Charles T. Kowal and Elizabeth Roemer, however, not enough observations were made to establish an orbit and it was subsequently lost. Then, in 2000, a seemingly new satellite was discovered it was soon confirmed that this was the same as the one observed in 1975.

Themisto only has a radius of about 4 kilometres and takes around 129 days to orbit Jupiter.

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