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Sh2-129 and Ou4



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 24 May; 1, 21, 25 June; and 3 July 2022,  Camera: ASI1600M (Astronomik Gen 2  Ha OIII RGB Filters)

Exposure:  2 panel mosaic - Ha (ea panel) - 64 x 5 min (gain-200 1x1), OIII (1 panel only) - 142 x 6 min (gain-240 1x1),  RGB (ea panel) - 20 x 2 min (gain-139 1x1) each RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight. Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  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.  Mosaic combine - MosaicByCoordinates  and GradientMergeMosaic - Pix Insight. 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 4656x3520 resolution (ea panel). Final Mosaic Image size is approximately  5002x3474.

North is up in this image.  This image shows the emission nebula Sh2-129 (also known as LBN 449, Ced 190) and  the outflow nebula Ou4.  The blue Ou4 is sometimes called "The Squid" and the red Sh2-129 is sometimes called "The Bat."  Ou4 is said to be embedded in Sh2-129 - evidence of this is the bright edge of the southern lobe of Ou4 beginning to impinge the denser Sh2-129. This image field also shows three LBN objects (the afore mentioned LBN 449, LBN 453, and 445) as well as some dark nebulae from TGU and Dobashi.   These objects and some of the brighter stars are identified in the annotated imageHorizontal FOV is approximately 2.67 degrees. Full size image scale is 1.92 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 21h 11m 39s Dec: +5954'33"


All images and content remain the property of Jim Thommes - copyright 2003 - 2022

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