|
|
|
Instrument |
12.5" RCOS @
~f/9 (2880 mm fl) 0.64 arcsec / pixel. The Zoomify image scale
is 0.85 to 3.33 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/ internal filter wheel, AstroDon Gen II Filters |
|
Acquisition Data |
7/18/2012 to 9/18/2012 Chino Valley, AZ... with CCDAutoPilot3
& CCDSoft. AOL guided |
|
Exposure |
|
Lum |
480 min. (16 x
30 min. bin 1x1 ) best of 22 |
|
RGB |
360 min. ( 8 x
15 min. each, bin 2x2) |
|
Ha |
720 min. (24 x
30 min, bin 1x1) |
|
|
Software |
-
CCDSoft, CCDStack, Photoshop CS6.
-
No SDSS stars were available for color balancing, so a standard image-train
color
calibration was used, as determined by
eXcalibrator v3.1, and then adjusted for altitude extinction.
-
PixFix32 (pre-beta) to
repair column defects.
-
CCDBand-Aid version 1.0 to repair STL-11000M vertical bars.
-
CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures,
and
the RGB color image.
-
PhotoShop for
none-linear stretching,
LRGB combine and adding Ha data to the red
channel..
-
Noiseware Pro, a PhotoShop plug-in.
|
|
Comment |
North is to the top.
NGC 6822, Barnard's Galaxy, was discovered by Edward Barnard in
1881. At a distance of only 1.6 million light-years, towards the
constellation Sagittarius, NGC 6822 is a member of our Local Group
of Galaxies. From our vantage point, the irregular dwarf galaxy
appears nearly rectangular. Surrounding the galaxy are several red
HII regions also know as emission nebula.
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