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Instrument |
12.5" RCOS @ ~f/9
(2880 mm fl) 0.64 arcsec / pixel. The Zoomify image scale is
0.85 to 2.87 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/
internal filter wheel, AstroDon G1 Filters |
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Acquisition
Date |
4/01/2009 to 5/13/2009
Chino Valley, AZ |
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Exposure |
|
Lum |
405 min (27 x 15 min,
bin 1x1) |
|
RGB |
405 min ( 9 x 15
min each, bin 1x1) |
|
Ha |
900 min (30 x 30 min
each, bin 1x1) |
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Software |
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CCDSoft, CCDStack,
Photoshop CS6, PixInsight and Noel Carboni's actions.
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eXcalibrator v4.1 for
(g-r) color balancing, using 22 stars from the SDSS-DR9
database.
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CCDBand-Aid
to repair STL-11000M vertical bars.
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CCDStack to calibrate, register,
normalize, data reject, combine the sub exposures and to create the RGB
image.
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PixInsight for gradient removal and
initial non-linear stretching.
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PhotoShop for the LRGB combine & final
touch-up.
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Noiseware 5, a PhotoShop plug-in.
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Comment |
North is ~ to the top... the image is rotated 21 Deg's to the right.
Discovered by Pierre
Méchain, in 1781, Messier 106 (also known as NGC 4258) is a spiral
galaxy in the constellation Canes Venatici. M106 is at a distance of
about 23 million light-years from Earth. It is also a Seyfert
II galaxy, which means that due to x-rays and unusual emission lines
detected, it is suspected that part of the galaxy is falling into a
supermassive black hole in the center.
NGC 4248, to the right,
at a distance of about 21 million light-years is a
possible companion galaxy.
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