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Craig & Tammy Temple



Location of Photo:

Hendersonville, TN, USA

Date/Time of photo:

March 7, April 5 & 29, 2013


Telescope: Stellarvue Raptor SVR105 @ f/7 Accessories: Stellarvue SFF7-21 flattener; Dew control by Dew Buster; Alnitak Flat-Man; Atik EFW2 Mount: Takahashi EM-200 Temma2 Camera: Atik 314L+ CCD @ -10.0C Guiding: Atik OAG; Starlight Xpress Lodestar via PHD Filters: Baader LRGB Exposure: 110 x 3min. (L) binned 1x1, 15 x 180 R, G, & B binned 2x2 Acquisition: ImagesPlus Camera Control v5.0 Processing: PixInsight 1.8 Post-processing: PixInsight 1.8; Adobe Photoshop CS5


NGC 3521 is a spiral galaxy that lies about 35 million light-years away in the constellation Leo (The Lion). This is a typical example of a flocculent spiral galaxy. These galaxies have “fluffy” spiral arms in contrast to those with the sweeping arms of grand-design spirals, such as the famous Whirlpool galaxy. Although French astronomer Charles Messier had identified several other galaxies of similar brightness in the constellation of Leo, he missed this one. It was in the year that Messier published the final version of his catalogue, 1784, that another famous astronomer, William Herschel, discovered this gem.




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