M13, also known as the “Great Hercules Globular Cluster” is one of the most prominent and best known globular clusters of the Northern sky.

With an apparent magnitude of 5.8, it is just visible with the naked eye under good conditions.
Its diameter is about 145 light-years, and it is composed of several hundred thousand stars.

M13 is 25.100 light years away from Earth

Other versions

Previous/older images:

Apr 01, 2006 – Canon 20D (Orion USA 80/600 ED 30m)

Image data

Object info
Name M13 – The Hercules Globular Cluster
Type Globular cluster
Constellation Hercules
Right ascension 16h 41m 41s
Declination +36° 27′ 37″
Distance 22.200 ly
Other designations NGC6205
Image info
Image date Jun. 01, 2011
Light frames 21x 3 min. UHC-S unbinned
Total integration 1h 03m
Dark frames 10x
Flat frames 15x p. filter unbinned. Created with an A3 size Posterpoweruk flatfield panel
Bias frames 15x
Software used CCDOps, CCDSoft, ImagesPlus, PixInsight LE, Photoshop CS4
Processing CCDOPS was used for focussing. Image Acquisition was done using CCDSoft.
All separate frames were calibrated, aligned and stacked in ImagesPlus 2.8.
PixInsight LE was used for DBE, Photoshop CS4 was used for further processing – curves adjustment, levels adjustment, etc.
Noel Carboni’s toolset was used as well (Local Contrast Enhancement, Deep Space Noise Reduction)
(L)RGB combine was done in Photoshop.
Equipment info
Telescope Orion Optics SPX 10″ Newton
Corrector Televue 2″ Paracorr coma corrector (FL: 1.380mm f/5.43)
Mount Losmandy G-11
Camera SBIG ST-8300M
Guide camera Atik 1HS Mono
Guide scope Celestron 60/700 Achromat
Autoguide software PHD Guiding
Filters IDAS LPS-P2
Location Landgraaf, The Netherlands
Image comments