NGC 4654 and NGC 4639
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ON IMAGE FOR FULL SIZE VIEW (2800x2100)
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: +13°45'51"
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