Wednesday, May 10, 2017

M104 - The Sombrero Galaxy in Virgo 25-Mar-2017

Distance 31.13 ± 0.42Mly

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300a (IR-modified). Exposure data: 10 - 10 min. exposures at IS1600. Ambient temp ~53°f.
Image capture scale: 0.41 arc-seconds/pixel (i.e., un-binned). Field of view (horizontal) = 35.5arc-min. Image capture using TSXPro Camera Add On (Software Bisque) via BackyardNikon.
Mount: Orion HDX110 German equatorial mount. Autoguided with an SBIG Sti autoguider, 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 Median combined and finished with a one pass unsharp filter in ThumbsPlus 10.

Cropped to final dimensions. No downsizing. Final image scale/resolution 0.41 as/p.

Seeing: FWHM: 2.92 pixels, 2.39 arcseconds (per TSXPro ImageLink).


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