Father Johann Georg Hagen

Obituary: MNRAS 91, 337 (1931); AN 240, 131 (1930)

Hagen is famous for his observations of 5800 NGC objects with the 16" refractor at Vatican Observatory, Castelgandolfo, starting in 1911. The result was published 1922 as A preparatory
catalogue for a Durchmusterung of nebulae. The zone catalogue
. Also known are the obscure Hagen clouds.

Vatican Observatory and 16" Zeiss Refractor

The 16" Refractor is in the left dome


Georgetown College Observatory