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NGC 4088 and 4085 in Ursa Major



Scope: Celestron 9.25 Edge 235 mm at f/7, Location: Blair Valley, Anza Borrego Desert, CA   20 March 2015  Camera: ST8300M

Exposure: Exposure: 16 x 9 min  (2x2 bin) exposure with UV/IR block,  8 x 4.5 min (3x3 bin) RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Calibrated, stacked (Sigma Kappa Combine) in Deep Sky Stacker, L - RGB channel registration, equalization, central gradient removal - Astroart.  Curves, Levels, and Luminance development, RGB combine - Images Plus. Finishing  - Photoshop. Color calibration with eXcalibrator. This image is UV/IR Block for the Luminance channel and then a LRGB combine with Luminance layering.  Saturation in LAB color.   Final Image size processed at approximately 2400x1813 cropped and resized to 2400x1800.

North is up in this image.  This field  shows the somewhat irregular galaxy NGC 4088 (also known as ARP 018 - morphology SAB(rs)bc). NGC 4088 is the dominant galaxy in this image; NGC 4085 is visually smaller (below NGC 4088). This field contains many other smaller galaxies most of which are background to NGC 4088 and NGC 4085.  Distance measurements vary from 22 to 68 million light years  for NGC 4088 with most clustered between 45 - 55 million light years and agrees with redshift estimates; NGC 4085 estimates  vary between 52 and 78 milliion light years . There are a number of  more distant (and thus visually smaller) galaxies in this field; some redshift based distance estimates are over two billion light years.  The smaller galaxies are identified  and highlighted in the annotated image.    The Horizontal FOV is 38'

Image center is approximately - Equatorial 2000: RA: 12h 05m 28s Dec: +5026'54" 


All images and content remain the property of Jim Thommes - copyright 2003 - 2015 copyright 2003 - 2012

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