LBN 635, 636, LDN 1340
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CLICK ON IMAGE FOR FULL SIZE VIEW (4000x2660) Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 25 October 2022, Camera: ASI2600MM (Astronomik type 2c LRGB filters) Exposure:
Exposure: Lum - 64 x 4 min (gain-130 1x1)
, RGB -20 x 2.5 min (gain-101 1x1) each RGB
exposures.
Processing: Data
Collection - Sequence Generator Pro (as FITs). Sub-frame calibration
- Pixinsight (WBPP). Sub-frame registration and integration (Average combine - Winsorized Sigma
Clipping) - PixInsight (WBPP). Mure Denoise - PixInsight. Non-linear
stretching and
gradient removal - PixInsight. Generation of starless nebulosity Luminance
images
for later processing - Star XTerminator. The "stars only" image separately stretched,
Luminance starless and mono stars combine for luminance construction -
PixInsight. RGB combine, RGB stretching,
Photometric RGB calibration (SPCC), and Luminance
layering - PixInsight. Final finishing -
Affinity Photo. Annotation - PixInsight, Aladin (Simbad), and Affinity
Photo. This image is a LRGB wide band image with Luminance layering. Image processed at
6180x4109 resolution. Final
Image size is approximately 4000x2660. North is up in this image. This
image shows the Bright Nebulae LBN 635 and LBN 636. They are an emission
region and a reflection nebula (respectively) and are centered in this image.
The dark nebula LDN 1340 as well as star forming clouds LDN 1340
A,B,C surround LBN 635 and 636. The IR spectrum open cluster Majaess 29 is
in the region of LDN 1340A and is mostly obscured by the dusty interstellar
medium of LDN 1340A. Its distance is 3,016 light years - meaning the cloud
must be closer in distance in order to obscure the cluster. The image shows a
wider field context of the region with its extended nebulosity. Interestingly,
the image shows some background galaxies. Several of these galaxies can be seen
through the dusty interstellar matter (though somewhat
obscurely). These galaxies have catalog designations from the ZOAG
catalog. These objects
and some of the brighter stars are identified in the annotated
image. Horizontal FOV is approximately 150
arc minutes. Full size
image scale is about 2.25 arcsec/pix. Image center is approximately - Equatorial 2000: RA: 2h 30m 11s Dec: +73° 02' 32"
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