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NGC 7635 "Bubble" and M52



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 31 July and 7 August 2019,  Camera: Atik 383L (Astronomik Gen 2  Ha OIII LRGB Filters)

Exposure: 12 x 8 min  (1x1 bin)  UV/IR block Lum filter, 20 x 10 min (2x2 bin) Ha filter, 16 x 10 min (2x2 bin) OIII  filter, 8 x 4 min (2x2 bin) each RGB filters.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Subframe calibration and registration - PixInsight. Subframe integration (Median combine -  Winsorized Sigma Clipping) - PixInsight.  Non-linear stretching, normalization and gradient removal - PixInsight.  Generation of starless nebulosity images - starnet++.  Starless color mapping and LRGB stars color mapping - PixInsight. Stars and Starless combine - PixInsight. Final finishing  - Photoshop.  RGB calibration - eXcalibrator. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This image is a  modified HOO narrow band mapping with RGB stars.  Images processed at 3354 x 2529 resolution. Final Image size is approximately  2100x2800.

North is up in this image.  This image field is the NGC 7635 / M52 region.  NGC 7635 is known by its common name of the "Bubble Nebula"  and also as LBN 548.  It is encompassed by the larger Sharpless2-162 emission nebula.   A portion of the Sharpless2-161 emission nebula is seen in the upper right. Two notable open star clusters are M52 (AKA NGC 7654)  and [KPS2012] MWSC 3726 (from the Milky Way Star Cluster catalog). There is the Planetary Nebula PN KjPn 8  lower left of the Bubble and the dark nebula LDN 1231 upper right of the Bubble. The open cluster M52 is approximately 4,400 light years distant;  [KPS2012] MWSC 3726 is approximately 8,153 light years distant.  These objects and some of the brighter stars are seen in the annotated image.  The Vertical FOV is 86'. Image scale of the full size image is 1.84 arcsec/pix. 

Image center is located approximately - Equatorial 2000: RA: 23h 22m 05s Dec: +6120'20"


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