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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
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The 16" Refractor is in the left dome
Georgetown College Observatory
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