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Instrument |
12.5" RCOS @
~f/9 (2880 mm fl) 0.64 arcsec / pixel. The Zoomify image scale
is 0.64 to 3.58 arcsec / pixel. |
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Mount |
Paramount ME |
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Camera |
SBIG STL-11000 w/ internal filter wheel, AstroDon Gen II Filters |
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Acquisition Data |
3/15/2012 to 3/28/2012 Chino Valley, AZ... with CCDAutoPilot3
& CCDSoft. AOL guided |
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Exposure |
Lum 570 min. (19
x 30 min. bin 1x1)
RGB 495 min. (11 x 15 min. each, bin 2x2) |
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Software |
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CCDSoft, CCDStack,
Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions
and and Russell Croman's GradientXTerminator.
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eXcalibrator 3.0 beta (g-r) color balancing, using 90 stars
from the SDSS-DR7 database.
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PixFix32 (pre-beta) to
repair column defects.
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CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures,
selective deconvolution and
the RGB color image.
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PhotoShop for
on-linear stretching
and LRGB combine.
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Noiseware Pro, a PhotoShop plug-in.
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Comment |
South is ~ to the top.
The image is rotated 135° CW
Arp 104 (NGC 5219 and
5218) was first noted by William Herschel in 1790. However at that
early date, the two galaxies were thought to be nebulae. The
interacting pair of galaxies is located in the constellation Ursa
Major at a distance of about 17 million light-years. The connecting
string of gas, dust and stars is about 22,000 light-years long.
The image also contains 2290 background galaxies down to magnitude
22.5, with many even fainter visible. Also of interest are
13 QSO's.
The most distant is at about 12.8 billion light-years, with a
redshift of 3.52.
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