M13 (NGC 6205) - The Great Globular Cluster in Hercules

LRGB combination - spikes added (Click for a larger view 1200 x 1200 px)



M13 (NGC 6205) - The Great Globular Cluster in Hercules, class V

Discovered by Edmond Halley in 1714, and catalogued by Charles Messier on June 1, 1764.

M13 is now modestly recognized as the Great Globular Cluster in Hercules, one of the brightest globular star clusters in the northern sky. Towards its center, stars are about 500 times more concentrated than in the solar neighborhood. Telescopic views reveal the spectacular cluster's hundreds of thousands of stars. At magnitude 5.8, M13 is visible to the keen unaided eye at a dark-sky observing site. At a distance of 25 000 light-years, the cluster stars crowd into a region 150 light-years in diameter.

Right Ascension 16 : 41.7 (h:m)
Declination +36 : 28 (deg:m)
Distance 25.1 (kly)
Visual Brightness 5.8 (mag)
Apparent Dimension 20 (arc min)

Seeing: Pickering 8 rating - Good to Excellent
Optic(s): Celestron 11" Schmidt Cassegrain + TSSCKorr2" flattener @ f/8
Mount: ASA DDM85 Premium - operated by my friend Emil Ivanov
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomics L, R, G, B set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-04-26
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 15 min, R = 15 min, G = 15 min, B = 15 min, (Bin 1), Subexposures = 3 min, Total Exposure Time - 60 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided thanks to ASA DDM85 Premium mount

PixInsight / PS


All Contents copyright Velimir Popov unless otherwise noted.