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M92 in Hercules



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 23 and 27 May 2020,  Camera: ST8300M (Baader LRGB filters)

Exposure: Exposure: 30 x 3 min and 24 x 8 min (1x1 bin) exposure with UV/IR block filter,  10 x 3.5 min (2x2 bin) each RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Subframe calibration - Pixinsight. Subframe integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Non-linear stretching and normalization  - PixInsight.  Curves, Levels, RGB combine, Luminance layering - PixInsight.  Final finishing  - Photoshop.  RGB calibration - eXcalibrator. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This image is a  RGB combine with Luminance layering.  Images processed at resolution 3352x2532. Final Image (full size) is approximately  2800x2100.

North is up in this image.  M92 is a large Globular Cluster (Class IV) in the constellation of Hercules and is the dominant object in this image. It is also known as NGC 6341 and is included in several other less popular catalogs. The image is composed with M92 to the left in order to include several notable background galaxies - IC 4645 (dist unk); PGC59931 (dist unk); PGC 59938 (dist 396 mly); and PGC59984 (dist 363 mly).  There are many other background galaxies - some of which are in the annotated image.  There are other visually apparent background galaxies that are only cataloged in UV and IR surveys (if cataloged at all).  M92 is about 26.7 thousand light years distant. The full size image has an image scale of 0.81 arcsec/pixel.  Some of the brighter stars  and two Quasars are identified in the annotated image. This image replaces an earlier image that can be seen in the Archives here. Horizontal FOV is approximately 38 arc minutes. 

Image center is approximately - Equatorial 2000: RA: 17h 16m 19s  Dec: +4310'07"


All images and content remain the property of Jim Thommes - copyright 2003 - 2020

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