Sh2-129 and Ou4
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CLICK ON IMAGE FOR FULL SIZE VIEW (5002x3474) 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
image. Horizontal 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: +59°54'33"
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