LBN 635, 636, LDN 1340

 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"

All images and content remain the property of Jim Thommes - copyright 2003 - 2023

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