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Sh2-91 in Cygnus



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 20 June  and 17 July 2020,  Camera: ST8300M (Ha RGB filters) and Atik 383L (Astronomik Gen 2  OIII  Filter)

Exposure:  24 x 10 min (2x2 bin) Ha filter, 16 x 10 min (2x2 bin) OIII  filter, 10 x 4 min (1x1 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 (modified HOO mapping) and RGB stars color - PixInsight. Stars and Starless combine - PixInsight. Final finishing  - Photoshop.  RGB calibration - eXcalibrator. Annotation - PixInsight, Aladin (Simbad), and PhotoShop. This image is a  modified HOO narrow band mapping with RGB stars.  Images processed at 3352 x 2532 resolution. Final Image size is approximately  2800x2100.

North is up in this image.  This image field is a composition of the Sh2-91 (also known as LBN 147) emission nebula object. It is the southeast part of a much larger (and roughly circular) supernova remnant known as SNR 065.3+05.7. Also in this image is Min 1-92, a Post-AGB Star (proto-PN) or pre-planetary nebula. In this image, it is so small, it simply looks like a slightly elongated star.  These objects and some of the brighter stars are seen in the annotated image.  The horizontal FOV is approximately 120'. Image scale of the full size image is 2.53 arcsec/pix. 

Image center is located approximately - Equatorial 2000: RA: 19h 35m 32s Dec: +2944'39" 


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

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