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|
|
Instrument |
12.5" RCOS @
~f/9 (2880 mm fl) 0.64 arcsec / pixel. The Zoomify image scale
is 0.85 to 3.57 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/ internal filter wheel, AstroDon Gen II Filters |
|
Acquisition Data |
5/11/2012 to 5/18/2012 Chino Valley, AZ... with CCDAutoPilot3
& CCDSoft. AOL guided |
|
Exposure |
|
Lum |
420 min. (14 x
30 min. bin 1x1 ) |
|
RGB |
405 min. ( 9 x
15 min. each, bin 2x2) |
|
|
Software |
-
CCDSoft, CCDStack,
Photoshop CS3 w/ the Fits Liberator plugin.
-
eXcalibrator v3.1 (g-r) color balancing, using 46 stars
from the SDSS-DR8 database.
-
PixFix32 (pre-beta) to
repair column defects.
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CCDBand-Aid (pre-beta) to repair the
STL-11000M vertical bars.
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CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures,
and
the RGB color image.
-
PhotoShop
none-linear stretching
and the LRGB combine.
-
Noiseware Pro, a PhotoShop plug-in.
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Comment |
North is to the right.
These three galaxies are located in the constellation Virgo.
In the center is NGC 4216, at a distance of 21 million light-years.
NGC 4206 is 46 million light-years away at the lower left. At
the upper right and 25 million light-years away is NGC 4222.
Deeper images show large looping tidal tails around NGC 4216. These
are formed by gravitational interaction with satellite galaxies.
At the bottom center,
marked in red, is a 21.7 magnitude Quasar with a redshift of z =
3.716.
Light Travel-Time = 11.626 billion years
Age at Redshift 3.716 = 1.673 billion years
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