Combination of 60 1 minute images with an H-alpha filter.
SBIG ST -8XE CCD. 100mm f/4 Nikon lens.
Sharpless 2-132 is a large but faint emission nebula in Cepheus. It is one of many such nebulae in Cepheus, as seen in the above image. The large nebula towards the bottom right of the image is Sharpless 2-132.
The above image was processed using the H-alpha images as the red channel. This is the preferred palette of the European Southern Observatory. The HST observers prefer to use the SII images as the red channel since the SII line is at a slightly longer wavelength than the H-alpha line. This results in a more green-dominated image as shown below.
