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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 2.86 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/
internal filter wheel, AstroDon Gen II Filters |
|
Acquisition Data |
3/13/2013 to 5/6/2013 Chino Valley, AZ... with CCDAutoPilot5
& CCDSoft. AOL guided. |
|
Exposure |
|
Lum |
510
min. (17 x 30 min. bin 1x1) |
|
RGB |
405 min. ( 9 x
15 min. each bin 2x2) |
|
|
Software |
-
CCDSoft, CCDStack,
Photoshop CS6, PixInsight and Noel Carboni's actions.
-
eXcalibrator v4.0 for
(u-g), (g-r) color balancing, using 35 stars from the SDSS-DR9
database.
-
CCDBand-Aid
to repair STL-11000M vertical bars.
-
CCDStack to calibrate, register,
normalize, data reject, combine the sub exposures, create the RGB
image and selective luminance Maximum Entropy deconvolution.
-
PixInsight for gradient removal and
initial non-linear stretching.
-
PhotoShop for the LRGB combine & final
touch-up.
-
Noiseware 5, a PhotoShop plug-in.
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Comment |
North is ~ to the
left. The galaxy is shown rotated 70° counterclockwise.
M109 (NGC 3992) is a
beautiful barred spiral galaxy in the constellation Ursa Major. At a
distance of 55 million light years, the galaxy is visible in
binoculars as a faint fuzzy patch. Pierre Méchain, Charles Messier's
assistant, discovered the galaxy in 1781. The three bright blue
galaxies are satellites of M109. From left to right they are UGC
6969, UGC 6940 and UGC 6923.
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