Messier 5 or M5 (also designated NGC 5904) is a globular cluster in the constellation Serpens. It was discovered by Gottfried Kirch in 1702. Spanning 165 light-years in diameter, M5 is one of the largest known globular clusters.
At 13 billion years old, M5 is also one of the eldest globular clusters in the Milky Way Galaxy. Its distance is about 24,500 light-years from Earth, and it contains more than 100,000 stars, as many as 500,000 according to some estimates.
Telescope: Celestron CS5 5-Inch Schmidt-Cassegrain (f/10 1250mm focal length)
Guiding Scope: Orion 80mm f/5.0 Refractor
Imaging Camera: Canon D100 Full Spectrum modified
Guiding Camera: Orion StarShoot AutoGuider
Imaging Software: Back Yard EOS v3.1
Guiding Software: PHD Guiding 2
Mount: Orion Sirius EQ-G
Light Frames: 16 x 60 seconds @3200 ISO + 20x 90 seconds @3200 ISO
Flats: 20 x 1/4000 seconds @3200 ISO
Darks: 10 x 60 seconds @3200 ISO + 10x 90 seconds @3200 ISO
Dark Biases: 20 x 1/4000 seconds @3200 ISO
Stacked & Processed: PixInsight v1.8