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Click the image for a wider,
50% size, view. (1800 x 1200 - 1.03 MB)
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Instrument |
12.5" RCOS @
~ f/9 (2880 mm fl) at 0.64 arcsec/pixel. Shown at 1.28 and 2.72 arcsec/pixel. |
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Mount |
Paramount ME |
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Camera |
SBIG STL-11000 w/
FW8 filter wheel & AstroDon Gen-2 LRGB filters. |
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Acquisition Data |
5/10/2016 to 6/4/2016 Chino Valley, AZ. with CCD Commander & CCDSoft. AOL
guided |
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Exposure |
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Lum |
390 min (13 x
30 min) Bin 1x1 |
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RGB |
360 min (8 x
15 min. each channel) Bin 2x2 |
eXcalibrator RGB ratios are 1.00,
0.92 & 1.26 |
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Software & Processing Notes |
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CCDSoft, CCDStack,
PixInsight, Photoshop CS6.
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eXcalibrator
v5.0 for (g:r) color balancing, using
103 stars from the SDSS-DR9 database.
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CCDBand-Aid to repair
KAI-11000M vertical bars.
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CCDStack to
calibrate all sub exposures and create the RGB image.
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PixInsight to
register, normalize, data reject, combine the luminance sub exposures,
gradient removal, non-linear stretching with HistogramTransformation and to create the LRGB image.
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PhotoShop for the final touch-up.
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Comment |
North is ~ to the top.
The galaxies are shown rotated 25° clockwise.
The NGC 5846 group is
located in the constellation Virgo. From left to right, the galaxies
are NGC 5850, 5846, 5845 and 5839. The respective distances are 122,
85, 74 and 63 million light years. |
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