NGC 4261 Region in Virgo
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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, 3 December 2016
Camera: ST8300M (Baader Ha LRGB filters) Exposure:
Exposure: 14 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, and finishing -
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 to the
left in this image.
The main feature in this image is the NGC 4261 galaxy group. The more dominant
galaxies in this group are NGC 4260, 4261, and 4281. NGC 4261 is believed to
host a massive central black hole. This group lies in the direction of the Virgo
Cluster of Galaxies in the sky but is considered separate in that it has about
twice the red shift of the Virgo Cluster. Also in this field is the
deep background cluster of Abell 1516. By red shift look back, the Abel Cluster
is estimated about 1.08 billion light years distant. These objects are identified in the
annotated
image.. The NGC 4261 galaxy group is
centered about 100 to 120 million light years distant. This image replaces an
earlier image that can be accessed in the Archives
here. Horizontal FOV is
approximately 88 arc minutes. Image center is located approximately - Equatorial 2000: RA: 12h 19m 24s Dec: +05°49'00"
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