Spiral Galaxy in Leo
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: L(R^Ha)GB = 60:20+50:20:20 (RGB Binned 2x2) This ^ symbol means "Lighten"
RGB Combine Ratio: 1: 1.05: 1.11
Filters: AstroDon RGB Tricolor
Location: Payson, Arizona
Elevation: 5150 ft.
Sky: Seeing FWHM = 4.5 arcsec (Maxim DL - 10min subframe), Transparency 9/10
Outside Temperature: 35 F
CCD Temperature: -30 C
Processing Tools: Maxim DL, Gralaks Sigma, Photoshop, PixInsight, Starazona Debloomer.
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There few galaxies in Leo that are
as detailed and display outer structure like this one. This 9.7
magnitude object spans a huge 13 arcminutes across, and in the
same field we can find many distant 16th magnitude galaxies as
well. The brightest of these is UGC5086, directly above the galaxy
near the top of the frame. This 16th magnitude dwarf is .9 mins
in size. A peculiar object is to the left (south) of the galaxy,
a small disk of light known as MAC0932+2122, another 16th magnitude
galaxy only .4 mins in size and of unknown classification. This
image has enhanced hydrogen regions, however still maintains
the overall G2V precise color calibration.
Standard L combine of
6 ten minute exposures with Astrodon Clear filter. 50m of Halpha
data was combiend at 75% with the 20m Red data using lighten
to maintain the G2v contribution for the stars accurately, yet
increase the contrast for the nebula only. Stars were darkened
or removed by subtracting the B+G image from the Halpha data.
This removed the Ha bright stars, and the galaxies core. That
was used for a normal RGB combine using G2V ratios.