Planetary Nebula in Canis Minor
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: 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: 35 F
CCD Temperature: -30 C
Processing Tools: Maxim DL, Gralaks Sigma, Photoshop, PixInsight, CCDOps Debloomer.
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low surface brightness nebula can just barely be detected visually
with a 20 inch telescope using an OIII filter, and a dark high
altitude Arizona dark sky site. The primary reason besides being
spread out over 6 arcminutes of sky, is that the dominant wavelength
in this nebula is a very deep crimson red, with little radiation
in either the green OIII or blue Hb emission lines. This G2V
balanced image shows us a very deeply colored nebula, with two
bright knots on either side of a deep blue 17.1 magnitude central
star. The structure resembles the Helix nebula in form, but of
course considerably fainter.
Sharp eyed imagers
will also see a small nebulous patch just off the lower left
edge of the nebula. This is MAC0751+0257, a 17th magnitude anonymous
calibrated color and saturation in this LRGB image was maintained
with a process I will be posting in an article in a week or two.