Johann Holetschek (29 August 1846 inThuma – 20 November 1923 in Vienna) was anAustrianastronomer, known for his research oncomets. Born in Thuma, inLower Austria, he worked at the observatory of theUniversity of Vienna. He died atVienna.

The craterHoletschek on theMoon is named after him.

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• 19th-century Austrian astronomers
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• Astronomers from Austria-Hungary
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