Comet Giacobini-Zimmer (21P) passing in front of M35

Tim B. Hunter
Location of photo
Grasslands Observatory, Elgin, AZ
Date/Time of photo
15 September 2015
ASA 20-inch f/3.6 refractor, FLI Proline 9000 CCD, 45-second exposures in photometric R, V, and B
Blended image showing Comet Giacobini-Zimmer (21P) at three different times in front of M35
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