Sharpless 308 (the Dolphin Nebula)
A Narrowband HOO Palette image of the faint emission nebula Sharpless 308 (also cataloged as Sh2-308, RCW 11, and LBN 1052), or simply referred to as the Dolphin Nebula.
Sh2-308 is an emission nebula and HII region located near the center of the constellation Canis Major, composed of ionised Hydrogen. It is about 8 degrees south of Sirius, the brightest star in the night sky. The nebula is bubble-like, surrounding a Wolf-Rayet star named EZ Canis Majoris. This star is in the brief, pre-supernova phase of its stellar evolution.
About this image:
This image is the result of photographing over several nights from the Southern Hemisphere (from dark rural skies, to my Pier at home). Deep Sky Objects like this is a challenge, as it pushes the limits of my modest Telescope gear.
24 x 600 sec. 7nm Hydrogen-Alpha (Ha).
24 x 600 sec. 6.5nm Doubly Ionized Oxygen (OIII).
William Optics Star 71mm f/4.9 Imaging APO Refractor.
Sensor cooled to -15°C on my QHY163M.
Calibration frames: Bias, Darks and Flats.
SGP Mosaic and Framing Wizard.
Astrometry.net ANSVR Solver via SGP.
Pre-Processing and Linear workflow in PixInsight,
and finished in Photoshop.
Center RA, Dec: 103.602, -23.925
Center RA, hms: 06h 54m 24.409s
Center Dec, dms: -23° 55' 29.074"
Size: 1.48 x 1.11 deg
Radius: 0.925 deg
Pixel scale: 3.33 arcsec/pixel
Orientation: Up is 113 degrees E of N
View an Annotated Sky Chart for this image.
View this image in the WorldWideTelescope.
Nr. 1 in Flickr Explore:
Top 25 Photos on Flickr in 2019:
APOD GrAG on 2020/01/01:
The Art of Astrophotography:
Also visit my Flickr Group: The Art of Astrophotography, that features the work of Astrophotographers from around the world.