M12 in Ophiuchus
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CLICK ON IMAGE FOR FULL SIZE VIEW (2744x3942) 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
image. This 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: -01°50'11"
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