title: Per Collinder
text: # Per Collinder
  
  Per Collinder (22 May 1890 – 6 December 1975) was a Swedish astronomer.
  
  Born at Sundsvall, he is known for a catalog of open clusters that he published in 1931, which is today known as the Collinder catalogue. He has written the books History of navigation and Worlds in Orbit.
  
  He was married twice, and his first wife gave him four children. Collinder died at Uppsala.
  
  