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Monday, April 6, 2015

A globular cluster Messier 3

I have shot couple of clusters at this Autumn season and I have published an image of Messier 13 in Hercules before. My light polluted location is not ideal for broadband targets, like clusters, but with little extra work with processing, they turned to be kind of beautiful. Image is shot at March 17. 2015.

Messier 3 (M3)
Click for a large image

LRGB shot of Messier 3

A closeup


Messier 3 (also known as M3 or NGC 5272) is a globular cluster in the constellation Canes Venatici. This cluster is one of the largest and brightest and It's located at a distance of about 33,900 light-years away from Earth. M3 has an apparent magnitude of 6.2, making it visible to the naked eye under dark conditions.

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

10-micron 1000

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, 8 x 600s = 1h 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 2h 20min

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