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.
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