Nebula in Cepheus
Instrument: 12.5" f/5 Home made Newtonian
Platform: Astrophysics 1200 QMD
CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling
Guider: SBIG ST4
Exposure: Ha^RGB = 180:20:20:20
RGB Combine Ratio: 1: 1.05: 1.11
Filters: AstroDon RGB Tricolor + Ha
Location: Payson, Arizona
Elevation: 5150 ft.
Sky: Seeing FWHM = 6.2 arcsec (Maxim DL - 10min subframe), Transparency 9/10
Outside Temperature: 45 F
CCD Temperature: -20 C
Processing Tools: Maxim DL, Gralaks Sigma, Photoshop, PixInsight, Starazona Debloomer.
HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS
GLOBULARS OPEN CLUST PLANETARIES LINKS
object surrounds the blue hot open cluster NGC7380 in an area
of the sky rich in red and blue nebulosities. At 7.2 magnitude,
the cluster is over 12 arcminutes in size, and contains 40 stars
in which the brightest members are 7.5 magnitude. Most have a
bluish tint, however there are dozens of background stars that
are yellows and oranges.
Sharpless 2-142 is mostly hydrogen emission, with isolated patches
of blue and white reflection nebulosity. it is larger than this
frame, spanning over half a degree in size and contains large
numbers of knots, globules and bright shock fronts from colliding
molecular clouds. A very peculiar white reflection nebula marks
the core of the nebula, seen just below center here. White reflection
nebula are rare, and are caused by the normally blue coloration
overlain by unilluminated yellowish dust neutralizing the color
An hour of standard
G2V balanced RGB data was taken for star and nebular color contrasts.
3 hours of hydrogen data was added in with lighten to both the
red and blue channels (Ha + Hb) to maintain precise star colors
and a nebular color as close as possible to the RGB color image.
Most of the stars in this image were severely bloomed, and thankfully
the Starizona Debloomer did a respectable job at cleaning them