- The Owl Nebula
Nebula in Ursa Major
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 = 8.5 arcsec (Maxim DL - 10min subframe), Transparency 8/10
Outside Temperature: 15 C
CCD Temperature: -20 C
Processing Tools: Maxim DL, Photoshop, PixInsight, RW Debloomer.
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of this object in both amateur and professional images ranges
quite a gamut. I've seen blues, greens, reds and every color
in between. This image is G2V calibrated and I feel is pretty
close to correct. The core of this object appears as a bluish-green
hue, surrounded by a crimson red double rim. The central star
is a lovely sky blue coloration as well. In the larger views
you will see six or seven stars inside the nebula itself. The
Owl is 12th magnitude, and a large 3.4 minutes in size - twice
the size of the Ring in Lyra.
The field is
filled with dozens of very faint galaxies, most 16th to 18th
magnitude. The most famous of these is the faint tuft of nebulosity
just touching the star to the upper right of the nebula. This
object, pgc34279 is a bright 16.1 magnitude spiral galaxy which
is .8 arcminutes long.
Seeing was horrid,
but the sky was clear and transparent for this image.