Wednesday, May 10, 2017

M13 - The Hercules Globular Cluster 29-Apr-2017

Distance 22.2kly (per )

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300a (IR-modified). Exposure data: Best 9 of 11 images at a variety of exposures between 30 and 180 seconds at IS800. Ambient temp ~53°f.
Image capture scale: 0.41 arc-seconds/pixel (i.e., un-binned). Field of view (horizontal) = 41.1 arc-min. Image capture using TSXPro Camera Add On (Software Bisque) via BackyardNikon.
Mount: Orion HDX110 German equatorial mount. Autoguided with a QHY5L-II monochrome planetary & autoguider camera, a Celestron OAG (off-axis guider) using PHD2 autoguiding software, not dithered.
Post processing: ImagesPlus 6.5: NEF conversion and calibration, alignment, stacking/combining using 0 dark frames, a 9 bias frame master and 0 flat frames, Sigma Clipped Average combined.
Stretching and DDP in ImagesPlus Image Processing 6.5.
One pass unsharp mask in ThumbsPlus v10.

No cropping; resized to 50pct. Final image scale/resolution 0.82 as/p.

Seeing: FWHM: 2.80 pixels, 2.30 arcseconds (per TSXPro ImageLink).


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