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Friday, September 4, 2015

Half a million stars and Messier 7

This is a second image produced as a collaboration with me and Eric Recurt. The data is shot from his observatory at Tenerife. The Observatory locates at 2400 m altitude and at 28 degrees North. The site has excellent seeing conditions, 0.8 " on average and can be below 0.3 "  

Messier 7, "My God, it's full of stars!
Be sure to click for a full size image! (Quote, 2001: A Space Odyssey)

Image shows the dense starfiel of Milkyway. Bright star cluster at lower middle is called Messier 7.
Just right from the Messier 7 locates a dark nebula B 287. In this image is visible about 500.000 stars of our Milky Way. 
Click the photo to see all of them! (2100x2100 pixels)

A closeup of Messier 7
Click for a large image

Planetary nebula PN Hf2-1 
Click for a large image

Planetary Nebula PN Hf2-1 is a blue dot at middle of the image area.


Messier 7 (M7, NGC 6475) is an open cluster of stars in the constellation Scorpius. This is the southernmost object in Messier's catalog.  Distance from the Earth is about 900 light years and it has a radius of 25 light years. Estimated age is around 200 million years.

Technical details

Processing workflow

Deconvolution with a CCDStack2 Positive Constraint, 27 iterations, added at 33% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
 340mm F3.3 astrograph


Cameras and filters
FLI PL 16803

Exposure times
Luminance, 11 x 300s = 55min
Red = 6 x 180s = 18min
Green = 6 x 180s = 18min
Blue = 6 x 180s = 18min
Total 1h 49min

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