Nebula in Cassiopeia
Instrument: 12.5" f/5 Home made Newtonian
Platform: Astrophysics 1200 QMD
CCD Camera: SBIG 10XME NABG with Enhanced Cooling
Guider: SBIG ST4
Exposure: LRGB = 60:20:20:20 (RGB Binned 2x2)
RGB Combine Ratio: 1: 1.05: 1.11
Filters: AstroDon RGB Tricolor
Location: Payson, Arizona
Elevation: 5150 ft.
Sky: Seeing FWHM = 6 arcsec (Maxim DL - 10min subframe), Transparency 8/10
Outside Temperature: 45 F
CCD Temperature: -30 C
Processing Tools: Maxim DL, Photoshop, PixInsight, CCDOps Debloomer.
HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS
GLOBULARS OPEN CLUST PLANETARIES LINKS
quarter of an arcminute wide, this exciting combination of red
emission and blue reflection nebulosity is difficult to photograph
because of the nearby bright variable star Gamma Cassiopeia,
which varies from 1.6 to 3rd magnitude. The difficulty is that
with such a brilliant star just outside the field, bright rays
and artifacts usually wash out the entire image. I spent quite
some time on this image removing such unwanted light scatter.
I was impressed
at how low of a noise this image was at -30C, no noise reduction
was needed on this shot.