Corona Borealis
Corona Borealis a Northern Hemisphere constellation otherwise known as the Northern Crown. It is one of the 48 Greek constellations originally described by the 2nd century astronomer Claudius Ptolemy (Wikipedia). Corona Borealis remains one of the 88 modern constellations defined by the International Astronomical Union (Wikipedia).
Corona Borealis (abbrev. = CrB; genitive = Coronae Borealis) covers 179 square degrees or 0.43% of the celestial sphere making it the 73rd largest constellation. It contains 37 stars brighter than apparent magnitude 6.5, the brightest star being Alphekka. See the Corona Borealis Star Chart for a figure illustrating this constellation including the identification of its brighter stars.
For more information see the entries for Corona Borealis at Wikipedia and U. Wisconsin. For a chart of Corona Borealis, see CrB (IAU).
Technical Details
- Object: Corona Borealis
- Date/Time: 2012 Jun 18 at 08:23 UTC
- Location: Bifrost Astronomical Observatory, Portal, AZ
- Mount: Losmandy G-11 German Equatorial Mount
- Lens: Nikkor 85mm f/2.8
- Camera: Canon EOS 550D (Rebel T2i)
- Field of View: 14.9° x 10.0° at 10.4 arc-sec/pixel (web version: 58 arc-sec/pixel)
- Exposure: 2 x 240s, f/2.8, ISO 800 and 120s, f/2.8, ISO 800 with Cokin A830 Diffusion Filter
- File Name: CrB-01w.jpg
- Processing (Adobe Camera Raw): Vignetting Correction, Noise Reduction, White Balance, Curves
- Processing (Photoshop CS5): Average Images, Curves, opacity (with diffusion image)
- Original Image Size: 3454 × 5179 pixels (17.9 MP); 11.5" x 17.3" @ 300 dpi
- Rights: Copyright 2012 by Fred Espenak. All Rights Reserved. See: Image Licensing.