Supernova Remnant SNR G160.8+02.6 (Sh2-221)

CLICK ON IMAGE FOR FULL SIZE VIEW (6000x4855)

Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA,  Dates: 8, 11, 19 November; 5, 8, 12 December 2023,  Camera: ASI2600MM (Astronomik type 2c Ha, OIII, RGB filters)

Exposure:  Panel 1: Ha - 92 x 4 min (gain-160 1x1), OIII - 92 x 4 min (gain-160 1x1), RGB 36 x 2 min (each filter - gain-101 1x1).

Exposure:  Panel 2: Ha - 88 x 4 min (gain-160 1x1), OIII - 88 x 4 min (gain-160 1x1), RGB 36 x 2 min (each filter - gain-101 1x1).

Processing: Data Acquisition -  N.I.N.A.  - as FITs.  Sub-frame calibration - Pixinsight (WBPP). Sub-frame  registration and integration (Average combine - Winsorized Sigma Clipping) - PixInsight (WBPP).  Mure Denoise - PixInsight. Deconvolution - BlurxTerminator (via PixInsight). Non-linear stretching and gradient removal - PixInsight.  Generation of starless nebulosity Ha and OIII images for later processing - Star XTerminator.  RGB combine, RGB stretching, SpectroPhotometric RGB calibration (SPCC) - PixInsight. Mosaic By Coordinates and Gradient Merge Mosaic - PixInsight.  Final finishing  - Affinity Photo. Annotation - PixInsight, Aladin (Simbad), and Affinity Photo. This image is a combination narrow band HOO/Foraxx image  with RGB stars. Image panels  processed at 6248x4176 resolution. Final Mosaic Image size is approximately  6000x4855.

North is up in this image.  This is a two panel mosaic image. It shows the Supernova Remnant SNR G160.8+02.6. This SNR is also known as HBH 9  and Sh2-221 (although this latter reference is unclear in Simbad and the early catalogs of Sharpless and Lynds). It is  a relatively close distance (compared to other SNR's) of about 1,760 light years.  In the right upper left is the small HII nebula Sh2-219 whose distance is much further than that of the SNR -  estimates range from about 12,700 to 13,700 light years. In the lower right is a complex consisting of LBN 755, Barnard 25, and LDN 1465.  There are also a few background  galaxies that can be seen in the full size image (at full zoom).  These objects and some of the brighter stars are identified in the annotated image.   Horizontal FOV is approximately 3.11 degrees. Full size image scale is about 1.87 arcsec/pix.

Image center is located approximately - Equatorial 2000: RA: 04h 59m 36s Dec: +46°31'15"

All images and content remain the property of Jim Thommes - copyright 2003 - 2024

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