Sh2-223 Region
|
CLICK ON IMAGE FOR FULL SIZE VIEW (4000x3013) Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 30 November and 4 December 2021, Camera: ASI1600MM (Astronomik Gen 2 Ha OIII RGB Filters) Exposure:
Exposure: Ha - 64 x 7 min (gain-300 2x2), OIII - 36 x 7 min (gain-300 2x2)
, RGB -20 x 3 min (gain-120 2x2) each RGB
exposures.
Processing: Data
Collection - Sequence Generator Pro (as FITs). Sub-frame calibration,
Sub-frame registration and integration (Average combine - Winsorized Sigma
Clipping) - PixInsight (WBPP). Mure Denoise - PixInsight. Non-linear stretching, normalization and
gradient removal - PixInsight. Generation of starless nebulosity Ha and
OIII images
for later processing - Star XTerminator. Curves, Levels, stars RGB combine,
stars Luminance
layering - PixInsight. Color Stars and Starless combine - PixInsight. Final finishing -
Affinity Photo.
Photometric RGB calibration
- PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity
Photo. This image is a
Bicolor narrow band image (modified HOO) with RGB stars. Image processed at
4144x2822 resolution. Final
Image size is approximately 4000x3013. North is up in this image. This
image shows the emission nebula (HII region) Sh2-223 (also known as LBN 768).
Sh2-223 is the brighter portion of nebulosity in this image. The larger circular
structure that is associated with Sh2-223 was thought to be a supermova remnant
(SNR G166.2+02.5). It was listed in Green's supernova remnant catalog (which
he has had several revisions during the past two decades). Between the 2001 and
2009 versions this supernova was dropped from Green's catalog - published work
by Foster et. al. showed that this larger structure is only a HII region. This
field also shows two open clusters - SAI 47 (aka MWSC 526) and COIN-Gaia
12. These objects
and some of the brighter stars are identified in the annotated
image. Horizontal FOV is approximately 115
arc minutes. Full size
image scale is 1.73 arcsec/pix. Image center is approximately - Equatorial 2000: RA: 05h 19m 04s Dec: +41°51'56"
|
All images and content remain the property of Jim Thommes - copyright 2003 - 2022Current Web Total Hits - - Unique Visitors |