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M14 (NGC 6402) is a globular cluster found in the constellation of Ophiuchus (the Serpent Holder). It is at a distance of 30 thousand light years, has a magnitude of 7.6, and spans 12 arc-min of sky. It was discovered by Charles Messier in 1764. It is said that this is the first astronomical object whose image was taken by a CCD camera.
The image above was taken with the 12" LX200, AO7, and ST-8E camera at f/6.3 on July 3rd 2003 at home from the Mistletoe Observatory. It is an RGB image (as detailed below) with a total exposure time of 40 min. Calibration and alignment were done in MaxIm DL. Final contrast curves were set in Photoshop.
Filter |
Exposure | Count | Binning |
Red | 10 min | 2 x 5 min | 2x2 |
Green | 10 min | 2 x 5 min | 2x2 |
Blue | 20 min | 4 x 5 min | 2x2 |