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NGC 4654 and NGC 4639



Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: DAA Observatory, Shelter Valley, CA,  28 March 2017  Camera: ST8300M (Baader Ha LRGB filters)

Exposure: Exposure:  16 x 12 min (1x1 bin) exposure with IR/UV Block filter, 8 x 4 min (2x2 bin) RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Calibrated, stacked (Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration, equalization, and gradient removal - Astroart.  Curves, Levels, RGB combine - ImagesPlus. Luminance Layering, final stretch, finishing, nd annotating  - Photoshop.  RGB calibration - eXcalibrator. This image is a  RGB combine with Luminance layering.  Color saturation in LAB color.  The IR/UV Blocking filter exposure stack was used for the luminance layer. Images processed at 3352 x 2532 resolution. Final Image size is approximately  2800 x 2100.

North is up in this image.   This galaxy field spans the border of Virgo and Coma Berenices. The two prominent spiral galaxies are NGC 4654 and NGC 4639. There are numerous  visually smaller galaxies in this field - NGC 4611, 4620, 4635, 4659 and IC 3735, 3742. One Galaxy in this field, PCG042700, has a whopping red shift of 3.734977 (upper right quadrant - better pointed out in the annotated image). This is a very dim object in this image.  These galaxies and a few brighter stars are identified in the annotated image.. NGC 4654  is about 63 million light years distant from Earth; NGC 4639 is about 66 light years distant. Horizontal FOV is 85'

Image center is located approximately - Equatorial 2000: RA: RA: 12h 47m 45s Dec: +1345'51"


All images and content remain the property of Jim Thommes - copyright 2003 - 2017 copyright 2003 - 2012

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