Hemisphere:  Northern  ·  Constellation: Vulpecula (Vul)  ·  Contains:  NGC 6820  ·  NGC 6823  ·  NGC 6830  ·  Part of the constellation Sagitta (Sge)  ·  The star 12Vul  ·  The star 13Vul  ·  The star 4Vul  ·  The star 5Vul  ·  The star 9Vul  ·  The star αSge  ·  The star αVul  ·  The star βSge  ·  The star δSge  ·  The star ζSge
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IC1305 - A Gazillion Stars, 


            David McClain
IC1305 - A Gazillion Stars
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IC1305 - A Gazillion Stars

Technical card

Imaging telescopes or lenses: Canon F2.8 200 mm Telephoto lens

Imaging cameras: Canon EOS 6D plain old DSLR

Mounts: Software Bisque Paramount Parmount MYT

Software: Backyard EOS DSLR image capture software  ·  Software Bisque Sky X Pro TheSkyX Professional suite

Filters: IDAS LPS D1 2"

Dates:Nov. 6, 2015

Frames: 4x300" (20')

Integration: 20'

Avg. Moon age: 24.83 days

Avg. Moon phase: 23.01%

Basic astrometry details

Astrometry.net job: 884055

RA center: 19h 39' 14"

DEC center: +20° 13' 22"

Pixel scale: 42.439 arcsec/pixel

Orientation: -179.946 degrees

Field radius: 6.313 degrees

Resolution: 606x913

Locations: Backyard Observatory, Tucson, AZ, United States


A wide field view of IC305... hmm... I see the body of Sagitta, but which thing, or where, or what, is IC-1305? FOV is roughly 7 x 10 deg.

The camera is red-challenged, and normally I'd boost the low-level red channel a bit. But here we see a red nebula near the top, so if red were present we'd expect to see more of that. So I won't retouch this image at all.

This is a region of the Milky Way where the bright band splits apart, revealing dark channels.

Many years ago we caught a Nova in this region in the Infrared. We discovered, along with others, that about half the novae, about 100 days after outbreak, almost instantly produce a graphite or slicate shell surrounding the central star as the expanding gas and dust cool sufficiently. Silicates leave a distinctive spectral feature between 10-20 micron wavelength.

After seeing from this image just how many stars are in that region, it isn't surprising that novae are common here.


Sky plot

Sky plot


IC1305 - A Gazillion Stars, 


            David McClain