Visible LHaRGB

Near infrared LRGB


Click above for larger images 


Catalogue and alternative designations NGC 253, Sculptor Galaxy, silver coin galaxy


Type Galaxy 
Position 00 47 33, -25 17 18
Constellation Sculptor
Camera and Telescope STXL6303E and 36.8 cm Ritchey Chretien
Focal Ratio F9
Exposure Details For the visible image, LHaRGB 150:80:120:150:120 with Astrodon series 2 filters.  All unbinned. For the infrared image, LRGB 135:80:80:80. Luminance unbinned and colours binned 2x2. The infrared shot utilizes the fact that the sensitivity of the 6303 chip extends beyond 1 micron. Red is assigned to a band  peaking at about 850 nm, Blue to 830 nm and blue to 750 nm. The luminance is "visible blocked" with zero response shorter than 700 nm. Special Astrodon filters (not sold anymore) were used. 
Description At magnitude 8 NGC 253 is one of the brightest galaxies in the sky and is quite large at 27.5 x 6.8'.  It was discovered by Caroline Herschel in 1783.