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Jon Greif

Location of Photo:

Anza-Borrego State Park, Borrego Springs, CA USA

Date/Time of photo:

November 10-12, 2023, between 8 pm and 4 am PST


Takahashi FSQ-85 refractor, ZWO ASI 533MC Pro capture camera, Optolong L-Pro filter, ZWO EAF focuser, ZWO 30 mm guide scope and ZWO ASI294MM Mini guide camera, Rainbow Astro RST-300 mount, ASIAIR Plus controller, Pixinsight processing software.


The Triangulum Galaxy is a spiral galaxy 2.73 million light-years from Earth in the constellation Triangulum. With a diameter of 61,100 light-years, the Triangulum Galaxy is the third-largest member of the Local Group of galaxies, behind the Andromeda Galaxy and the Milky Way. The Triangulum Galaxy was probably discovered by the Italian astronomer Giovanni Battista Hodierna before 1654, and then re-discovered, independently, by Charles Messier, on the night of August 25–26, 1764. It was published in his Catalog of Nebulae and Star Clusters as Messier Object Number 33 (M33). This image was captured over two nights this past weekend while camping in Anza-Borrego State Park, and represents 16 hours of exposure time.