|
|
|
Instrument |
12.5" RCOS @
~f/9 (2880 mm fl) 0.64 arcsec / pixel. The Zoomify image scale
is 0.64 to 3.40 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/ internal filter wheel, AstroDon Gen II Filters |
|
Acquisition Data |
10/16/2011 to 10/17/2011 Chino Valley, AZ... with CCDAutoPilot3
& CCDSoft. AOL guided |
|
Exposure |
|
Lum |
210 min. (14 x
15 min. bin 1x1 ) |
|
RGB |
270 min. ( 6 x
15 min. each, bin 2x2) |
|
|
Software |
-
CCDSoft, CCDStack,
PixInsight, Photoshop CS3 w/ the Fits Liberator plugin.
-
No SDSS stars were available, so a standard image-train
color
calibration was used... as determined by
eXcalibrator v3.1.
-
PixFix32 (pre-beta) to
repair column defects.
-
CCDBand-Aid (pre-beta) to repair the
STL-11000M vertical bars.
-
CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures,
and
the RGB color image.
-
PixInsight was used to remove strong
gradients from a bright nearby Moon.
-
PhotoShop
none-linear stretching
and the LRGB combine.
-
Noiseware Pro, a PhotoShop plug-in.
|
|
Comment |
North is to the top.
The Open Star Cluster, NGC 1245, is in the direction for the
constellation Perseus, at a distance of 8200 to 9200 light-years.
William Herschel discovered it in 1786. The cluster contains over
100 stars and has an apparent diameter of nine arc-minutes. NGC 1245
is an excellent object for the backyard observer and is best seen
with a magnification of 100-200x.
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