Sky and Telescope - December 2016

Sky and Telescope - December 2016 - 75 ◀ STARRY SNOWBALL Dan Crowson One of the largest, brightest globular clusters, Messier 3 lies 34,000 light-years away. Its roughly 500,000 stars create a 6th-magnitude glow in Canes Venatici. Details: Astro-Tech AT12RCT Ritchey-Chrétien astrograph with SBIG STF-8300M CCD camera and LRGB ﬁlters. Total exposure: 6 hours. ▾ JELLYFISH NEBUL A Barry Schellenberg Also known as IC 443, this glowing bubble near Eta Geminorum is the remnant of a supernova that exploded roughly 5,000 lightyears away. Details: Borg 101ED astrograph with QSI 683WS-8 CCD camera and Astrodon Hα, S II, and O III ﬁlters. Total exposure: 40.7 hours. Sk yandTelescope.com December 2016 75 http://www.SkyandTelescope.comTable of Contents for the Digital Edition of Sky and Telescope - December 2016ContentsSky and Telescope - December 2016 - Cover1Sky and Telescope - December 2016 - Cover2Sky and Telescope - December 2016 - 1Sky and Telescope - December 2016 - ContentsSky and Telescope - December 2016 - 3Sky and Telescope - December 2016 - 4Sky and Telescope - December 2016 - 5Sky and Telescope - December 2016 - 6Sky and Telescope - December 2016 - 7Sky and Telescope - December 2016 - 8Sky and Telescope - December 2016 - 9Sky and Telescope - December 2016 - 10Sky and Telescope - December 2016 - 11Sky and Telescope - December 2016 - 12Sky and Telescope - December 2016 - 13Sky and Telescope - December 2016 - 14Sky and Telescope - December 2016 - 15Sky and Telescope - December 2016 - 16Sky and Telescope - December 2016 - 17Sky and Telescope - December 2016 - 18Sky and Telescope - December 2016 - 19Sky and Telescope - December 2016 - 20Sky 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