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NGC 7023 (Caldwell 4) - a reflection nebula in Cepheus
Exploring the Digitized Sky Survey
NGC 7023 (Caldwell 4) - a reflection nebula in Cepheus The effect of stretching the image, using the Digital Development option in MaxIm DL, can be quite dramatic. This is one of the reason why I am concerned when I read about the discovery of new astronomical objects based on short exposures using small telescopes. I think it is quite clear from the image that the cloud of gas and dust known as Caldwell 4 is significantly larger than just the portion reflecting the star light (and hence appearing blue) - look at the dark zones around the perimeter where there are few, if any, stars. http://martin-nicholson.info/ngc7023/ngc7023.htm Martin Nicholson, Daventry, England. http://www.martin-nicholson.info/1/1a.htm Visit the Astronomical Hall of Shame at http://www.geocities.com/queen5658/ |
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