|
|
|
Instrument |
12.5" RCOS @ ~f/9
(2880 mm fl) 0.64 arcsec / pixel. The Zoomify image scale is
0.85 to 2.84 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/
internal filter wheel, AstroDon Gen II Filters |
|
Acquisition Data |
1/9/2013 to 3/17/2013 Chino Valley, AZ... with CCDAutoPilot5
& CCDSoft. AOL guided. |
|
Exposure |
|
Lum |
840
min. (28 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 54 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 and create the RGB
image.
-
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 top.
NGC 2841 is a tightly
wound unbarred spiral galaxy in the constellation Ursa Major. A 2001
Hubble Space Telescope survey, of the galaxy's Cepheid variables,
shows that NGC 2841 is about 46 million light-years from Earth. With
a diameter of over 150,000 light–years, the galaxy is larger than
the Milky Way.
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