|
|
|
Instrument |
12.5" RCOS @
~f/9 (2880 mm fl) 0.64 arcsec / pixel. The Zoomify image scale
is 0.85 to 3.24 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/ internal filter wheel, AstroDon Gen II Filters |
|
Acquisition Data |
10/29/2011 to 12/28/2011 Chino Valley, AZ... with CCDAutoPilot3
& CCDSoft. AOL guided |
|
Exposure |
Lum 510 min. (34
x 15 min. bin 1x1) best 34 of 51
Ha
480 min. (16
x 30 min. bin 1x1)
RGB 405 min. (
9 x 15 min. each, bin 2x2) |
|
Software |
-
CCDSoft, CCDStack,
Photoshop CS and Noel Carboni's actions.
-
eXcalibrator for (b-v), (v-r) color balancing, using 10 stars
from the NOMAD1 database.
-
PixFix32 (pre-beta) to
repair column defects.
-
PixInsight for
on-linear stretching
and gradient removal.
-
CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures and
create the color image.
-
PhotoShop for the LRGB
combine and final tweaks.
-
Noiseware Pro, a PhotoShop plug-in.
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|
Comment |
North is to the top.
NGC 925 is a strongly
barred somewhat distorted galaxy in the constellation Triangulum.
The NED database places the galaxy at a distance of about 14.5
million light-years. NGC 925 has at least 132 cataloged HII regions.
Many of these bright red-pink areas are visible in the above image.
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