M3 (also known as NGC 5272) is a globular cluster. It's about 34,000 light-years away and is made up of around 500,000 stars. It's one of the most beautiful globular clusters, easily seen in a moderate-sized amateur telescope.

Technical Information      
Date:                        June, 2013
Location:                 Green Valley, Arizona
Telescope:               Takahashi FSQ-106EDX
Camera:                   SBIG STT-8300M
Filters:                      Astrodon Gen 2
Mount:                     AstroPhysics 1200
Exposure:                 LRGB = 270:60:60:60 minutes, all unbinned
Software:                  Acquisition: Maxim DL 5, TheSkyX, Pinpoint, CCD Commander
                                  Processing: CCDStack, PhotoShop CS6 with various plugins