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Instrument |
12.5" RCOS @ ~f/9
(2880 mm fl) 0.64 arcsec / pixel. Shown at 1.28 and
3.56 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/
FW8-STL filter wheel, AstroDon Gen II Filters. |
|
Acquisition Data |
7/29/2013 to 7/30/2013
Chino Valley, AZ. with CCDAutoPilot5 & CCDSoft. AOL guided. |
|
Exposure |
|
RGB |
180 min. ( 6 x
10 min. each bin 2x2) |
|
|
Software |
-
CCDSoft,
CCDStack, PixInsight & PhotoShop.
-
No SDSS stars were
available for color balancing, so a standard image-train
color
calibration was used, as determined by
eXcalibrator v4.1, and then adjusted for altitude extinction
-
PixFix32 (pre-beta) to
repair hot/cold pixels and column defects.
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CCDStack to register,
normalize, data reject , combine sub exposures and creating the RGB.
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 6633 is an open cluster in the constellation Ophiuchus. At a
distance of about 1000 light-years, the cluster appears nearly as
large as the full moon. NGC 6633 contains about 30 young hot blue
stars with an age of about 600 million years. This does not seem
very young until we compare to our Sun's age of about 4.5 billion
years.
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