30  June  2017
The magnificent Globular Cluster Messier 3    


By Felix Ecker

Messier 3 with brighter star HIP 66725 and some small backround galaxies.
 This very frequently imaged globular cluster in the constellation Canes Venatici near the star Arcturus appears quite
 big even with smaller telescopes and its brightness of 6.2mag makes it a great Messier-Object for both
visual observations and photography. In fact it's core is so full of stars, it can be very tricky to capture both
the surrounding area and the individual stars in the core of this cluster. In this case several exposure times have
 been used to create something similar to an HDR image. Scientists have detected 274 variable stars, which
 is the highest known amount in any cluster yet. This makes it besides it's sheer beauty for amateurs a very
 interesting collection of about 500.000 stars for scientists too.
 Image Data:
 Site: Hellmonsödt, Austria
 Telescope: RASA Astrograph 11inch f2.2
 Camera: Atik 460ex mono
 Filters: Baader LRGB 2"
 Mount: Skywatcher AZ-EQ6
 Software: Maxim DL 6, Pixinsight, Photoshop CS6, DSS
 Exposures: 15*2min R, G, B and 120*2min L + 20*1min L all binned 1x1
 Calibration: Darks, Flat, Bias


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