title: Johann Holetschek
text: Johann Holetschek (29 August 1846 in Thuma – 20 November 1923 in Vienna) was an Austrian astronomer, known for his research on comets.  Born in Thuma, in Lower Austria, he worked at the observatory of the University of Vienna.  He died at Vienna.      
  
  The crater Holetschek on the Moon is named after him.
  
  Sources
  All About Austria
  
  19th-century Austrian astronomers
  1846 births
  1923 deaths
  Discoverers of comets
  20th-century Austrian astronomers
  People from Waidhofen an der Thaya District
  Academic staff of the University of Vienna
  University of Vienna alumni