Wednesday, April 20, 2016

M27 - The Dumbell Nebula 20-Apr-2016





Distance 1,360ly, in Vulpecula

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300. Exposures: 3 @ 5 min., Ambient temp 59f.
Image capture scale: 0.41 arc-sec/pixel (un-binned). Resized to 50% in ThumbsPlus. Final image scale/resolution 0.82 as/p. Field of view (horizontal) = 24.5 arc-min. Image capture using ImagesPlus Camera Control 6.0.
Mount: Orion HDX110 German equatorial mount. Autoguided with an SBIG Sti autoguider and a Celestron OAG (off-axis guider), with PHD2 autoguiding software, not dithered.
Post processing: ImagesPlus 6.5: NEF conversion and calibration, alignment, stacking/combining using 0 dark frames, a 5 bias frame master and 0 flat frames, Average combined. HDR Stretch, Curves and multiple enhancements in ImagesPlus. Cropped and resized to final dimensions, one pass unsharp mask, contrast, saturation, gamma in ThumbsPlus.

20160420_M27_CombAvg-IPddpadjnr-TPadj.jpg

Monday, April 18, 2016

A Marvelous Coincidence



The Sun and Moon have nearly the same angular size a seen from Earth and so make total solar eclipses possible.

Sunday, April 17, 2016

M16 - The Eagle Nebula 13-Apr-2016




Distance 7,000 ly, in Serpens

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300. Exposures: 3 @ 10 min., Ambient temp 56f.
Image capture scale: 0.41 arc-sec/pixel (un-binned). Field of view (horizontal) = 10.9 arc-min. Image capture using TSXPro Camera Add On (Software Bisque).
Mount: Orion HDX110 German equatorial mount. Autoguided with an SBIG Sti autoguider, a Celestron OAG (off-axis guider) and a Starlight Xpress SXV-AOLF (Adaptive Optics Large Format) device using PHD2 autoguiding software, not dithered.
Post processing: ImagesPlus 6.5: NEF conversion and calibration, alignment, stacking/combining using 0 dark frames, a 5 bias frame master and 7 flat frames, Min/Max Exluded Average combined. HDR Stretch, Curves and multiple enhancements in ImagesPlus. Cropped to final dimensions of 1600x1600. One pass unsharp mask, downsized 50% in ThumbsPlus. Final image scale/resolution 0.82 as/p).

20160413_M16_CombExcAvg-IPddpadj2-TPadj-IPnr-TP2.jpg

Galaxy M66 in Leo 12-Apr-2016




Distance 36 ± 5.0 Mly

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300. Exposures: 4 @ 10 min., Ambient temp 55f.
Image capture scale: 0.41 arc-sec/pixel (un-binned). Field of view (horizontal) = 19.4 arc-min. Image capture using TSXPro Camera Add On (Software Bisque).
Mount: Orion HDX110 German equatorial mount. Autoguided with an SBIG Sti autoguider, a Celestron OAG (off-axis guider) and a Starlight Xpress SXV-AOLF (Adaptive Optics Large Format) device using PHD2 autoguiding software, not dithered.
Post processing: ImagesPlus 6.5: NEF conversion and calibration, alignment, stacking/combining using 0 dark frames, a 5 bias frame master and 7 flat frames, Min/Max Exluded Average combined. HDR Stretch, Curves and multiple enhancements in ImagesPlus. Cropped to final size. Two passes unsharp mask, downsized 50% in ThumbsPlus. Final image scale/resolution 0.82 as/p).

20160412_M66_CombExcAvg-IPddpadj-TPadj.jpg

NGC3628 - The northern galaxy in the Leo Triplet 02-Apr-2016

NGC3628 - The northern galaxy in the Leo Triplet 02-Apr-2016

For details see here
 



Sunspot AR2529 - 17-Apr-2017

Sunspot AR2529 - 17-Apr-2017

Didn't get a chance to take a shot at this until today. Still, pretty respectable size as far as sunspots go.
 
 
Taken with a Nikon D5300, 1/640th sec at ISO 100 through an Explore Scientific 127mmED refractor. Original 6000x4000 frame cropped to 3000x2000 and resized to 50pct.
 

Saturday, April 9, 2016

Recent Work - May, 2015

After a brief hiatus, I'm back to astrophotography.

Here is a sampling of photos taken with the Celestron 14 inch EdgeHD and the Canon 6D (full frame) camera: http://www.pbase.com/wjshaheen/apod_submissions

And, here is a gallery of cumulative work done over the years:
http://www.pbase.com/wjshaheen/astro_images_by_subject

William Shaheen
Gold Canyon, AZ
USA