Cluster and Planetary Nebula in Scutum
Instrument: 12.5" f/5 Home made Newtonian
Mount: Astrophysics 1200 QMD
CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling
Guider: Meade DSI Pro w/Lumicon Newt Easy Guider
Exposure: LRGB = 60:20:20:20 (RGB Binned 2x2)
AstroDon RGB Combine Ratio: 1: 1.05: 1.11
Location: Payson, Arizona, Elevation: 5150 ft.
Sky: Seeing FWHM = 10 arcsec (Maxim DL - 10min subframe), Transparency 9/10
Outside Temperature: 55 F
CCD Temperature: -30 C
Image Processing Tools:
Maxim DL: Calibration, deblooming (Starizona Debloomer), aligning, stacking
PixInsight: Curves, Deconvolution
Photoshop CS2: Curves, Color Correction, Gradient removal (Grad Xterminator), Cleanup
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pairing of bright globular cluster and very dim low surface brightness
planetary nebula lies in the constellation of Scutum, in a very
star rich field. The globular cluster to the upper right is NGC6712,
a 8.1 magnitude object of moderate concentration is 10 arcminutes
in size and contains stars ranging from 13 to 16th magnitude.
It appears mostly yellow in this image from interstellar extinction.
On the lower
left is the large but very dim planetary nebula IC1295. Spanning
a huge 90 arc seconds in size, it is around 15th magnitude and
in the largest image you can see a small faint blue central star
which is 15.5 magnitude. This planetary is unusual in that it
photographs a stunning cornflower blue color, unlike most which
are plain greenish or red.
And there is
one other interesting object, albeit rather diminuative in this
field, a arcsecond sized 14th magnitude planetary nebula Kohoutek
4-8 which is located about 2 o'clock from IC1295 and about a
quarter way towards the globular. It also appears blue in color,
and you can see it plotted clearly in Megastar.