M13 in Hercules




Scope: C8 f/7.2; Location: Del Mar, CA;  11 May. 2005; Camera: Artemis285

Exposure: 8 x 120 sec Luminance exposure (bin 1x1)with Baader IR Block Filter; 8 x 45 sec RGB (bin 2x2)

Processing: Images were captured Artemis Capture (as FITs). Aligned/stacked in Registax 3 and saved as FITS. Luminance and Color channels were scaled and rough color balanced in IRIS. Channels were co-registered in IRIS. The 120 sec exposures were used as the main luminance with level adjustments and curves to bring out object detail. Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB).  Minor star repair was made on brighter edge stars to eliminate artifacts created by level and curve adjustments . Color balancing and final touches were done in Photoshop. SGBNR was used to smooth background noise on the final result. Final Image size is approximately 1392x1040

This image was the third one with the Artemis285 on loan. The image was taken with fairly good conditions at a light polluted site. This is a guided image.  M13 is one of the most prominent and best known globulars of the Northern celestial hemisphere. It  is one of the more outstanding globular clusters - it contains an estimated several 100,000 stars and is estimated to be about 25,100 light years distant. According to Kenneth Glyn Jones, M13 is peculiar in containing one young blue star, Barnard No. 29, of spectral type B2 (I believe it can be seen in this image in the lower right of the globular disc). The membership of this star was confirmed by radial velocity measurement, and is strange for such an old cluster - apparently it is a captured field star. This image replaces an earlier image that can be seen in the Archives here. Horizontal FOV is 21'

Image Center is approximately - Equatorial 2000: RA: 16h 41m 42s Dec: +3627'39"


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