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M12 in Ophiuchus




Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 24 May 2022,  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: L - 62 x 3 minutes (gain-121 2x2) ,  RGB - 20 each x 2 minutes  - (gain-121 2x2).

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight (WBPP). Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight (WBPP).  Mure Denoise - PixInsight.  Non-linear stretching, normalization and gradient removal - PixInsight.   Curves, Levels, RGB combine, Luminance layering - PixInsight. Photometric RGB calibration (SPCC) - PixInsight.  De-convolution - BlurXTerminator.  Final finishing  - Affinity Photo.  Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  LRGB with luminance layering.  Image processed at 3942x2744 resolution. Final Image size is approximately  2744x3942.

North is up in this image.  This is the Globular Cluster M12 (also known as NGC 6218). Its distance is about 15,680 light years. Two galaxies in the outer extent of M12 (visually) are LEDA 110303219 and 2MASS j16470262-0202514. The distance of LEDA 1103219 is 797 million light years (by redshift estimate).  The edge-on galaxy in the upper left is UGC 10554 (Scd edge-on) - its distance is 74 million light years (by redshift) and 104 million light years (by Tulley-fisher) These objects, information, background galaxies and some of the brighter stars are identified in the annotated imageThis image replaces an earlier image that can be seen in the Archives here. Vertical FOV is approximately 38.15 arc minutes. Full size image scale is approximately 0.58 arcsec/pix.

Image Center approximately - Equatorial 2000: RA: 16h 47m 34s Dec: -0150'11"


All images and content remain the property of Jim Thommes - copyright 2003 - 2023

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