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Sunday, March 22, 2015

Messier 13, the Great Globular Cluster in Hercules

The season is about to end up here 65N for about six months. We have had clear skies for a couple of weeks now and I have lots of new material to publish in near future.

Messier 13 is a kind of fast project shot between dimmer targets. My location is not ideal for a broadband targets, like galaxies and clusters, due to massive light pollution. How ever, this is my try with a M13.

Messier 13
Click for a much large image

LRGB photo of the Great Globular Cluster in Hercules. Note. galaxy NGC 6207 at a lower left corner. 


M13 locates in constellation Hercules at a distance of 25000 light years. The Great Globular Cluster in Hercules is one of the most brightest globular star clusters in northern sky. Stars are backed to a spherical formation with a diameter of about 150 light years.

Technical details

Processing work flow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Celestron Edge HD 1100 @ f7 with 0,7 focal reducer for Edge HD 1100 telescope

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2

Custom Scientific LRGB 50mm Square Filters 

Exposure times
Luminance, 14 x 600s = 2h 20min
Red, 6 x 200s binned 2x2 = 20 min.
Green, 6 x 200s binned 2x2= 20 min.
Blue, 6 x 200s  binned 2x2 = 20 min
Total 3h 20min

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