North is to the
This image uses the
Hubble palette, where the SII, Ha and OIII data are mapped to the
red, green and blue channels respectively. While the OIII data are
present throughout the image, they are much weaker relative to the
SII and more so to the Ha.
To create the image, the Ha data were
reduced and the brightness of the OIII was strongly increased. To
bring out more detail, the colors were manipulated with PhotoShop's
Selective Color routine. This makes it a "modified" Hubble palette
Sh2-171 is about 2700
light-years from Earth in the constellation Cepheus. The emission
cloud is lit and ionized by the young star cluster Berkeley 59.
The image also
contains six bright and eight dark nebulae as
catalogued by Beverly Lynds. After taking a close look, many of the
entries seem to be just for the sake of making the catalog larger
and have little consequence, if any.