Sh2-91 in Cygnus
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CLICK ON IMAGE FOR FULL SIZE VIEW (2800x2100) 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
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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: +29°44'39"
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