Sharpless SH-2 308



Sharpless 308 (also known as Sh2-308, S 308 or RCW 11) is a cosmic bubble of nearly 60 light-years across, located some 5,200 light-years from Earth in the constellation of Canis Major, the Greater Dog. Known as a Wolf-Rayet bubble, it has an age of about 70,000 years and an expansion velocity of about 60 kilometers per second.

Imaging telescopes or lenses: William Optics FLT 110 TBM with focal reducer Flt110 w Reducer
Imaging cameras: QSI 683WSG-8 OAG QSI 683
Mounts: Skywatcher NEQ6
Guiding cameras: Orion Starshoot Autoguider Starshoot autoguider
Focal reducers: WILLIAM OPTICS P-FLAT 4 P-Flat 4
Software: Photoshop CS5,  Nebulosity 3.2, Noel Carboni’s Astro Tools for PhotoShop Noel Carboni Actions,  PHD GUIDING,  Nik Software, Inc. Nik Filters,  Sky Safari Pro, iOS Sky Safari Pro
Filters: astrodon 5nm NB filters NarrowBand Filters
Accessories: Kendrick Standard Dual Channel Controller
Resolution: 2775×2199
Dates: Feb. 13, 2015
Frames: 45×900″
Integration: 11.2 hours
Avg. Moon age: 22.98 days
Avg. Moon phase: 41.24%
RA center: 103.595 degrees
DEC center: -23.847 degrees
Pixel scale: 1.742 arcsec/pixel
Orientation: 88.776 degrees
Field radius: 0.856 degrees
Locations: My backyard, Melbourne, Victoria, Australia

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