Selected as Astronomy Picture of the Day on 19 May 2006
22 narrow-band H&alpha images were combined into a mosaic covering approx. 41°×23°. In addition, a 4-frame color mosaic was assembled from images taken with a Canon EOS 350D digital SLR camera. In the color mosaic, the R channel was "enhanced" with the Hα data ("lighten only" mode); in addition, contrast-stretched copies of the Hα image were superimposed on the G and B channels, resulting in a "semi-false-color" HαRGB image.
|Camera||:||Ha: Starlight Xpress SXV-H9, Color: Canon EOS 350D|
|Lens||:|| Ha: Minolta 1.4/50 mm lens, stopped down to f/2.4.
Color: Canon 1.8/50 mm, stopped down to f/4.
|Filter||:||Astronomik Ha (13 nm FWHM)|
|Mount||:||Vixen Super Polaris DX|
|Dates||:|| Ha: 21/22 Mar. 2004, 24-27 Feb. 2006
Color: 03 Mar. 2006
|Exposure||:||Ha: 2x15 min; Color: 6x5 min|
|Site||:|| Ha: Cederberg Observatory;
Color: Koornlandskloof Guest Farm
|Processing||:|| Bias, dark frame, flat field correction, registration and digital development: IRAF;
mosaic assembly: SExtractor, Match, custom software and Swarp;