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LBN 639 in Pisces



Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 15, 19 September 2020,   Camera: ST8300M (Baader  LRGB filters)

Exposure: Exposure: 26 x 12 min  (1x1 bin) exposure with UV/IR block filter,  12 x 5 min (1x1 bin) each RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Subframe calibration - Pixinsight. Subframe  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Non-linear stretching, normalization and gradient removal - PixInsight.  Generation of starless nebulosity Luminance image for later processing - starnet++. Curves, Levels, RGB combine, Luminance layering - PixInsight. Stars and Starless  Luminance combine - PixInsight.  Final finishing  - Photoshop.  RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This is a RGB image with luminance layering. The luminance stack, slightly stretched, was separated in to starless and "stars only" images. The stretching on each (starless and "stars only") continued separately. The starless  and "stars only" was then combined  after they were separately finished. The resulting image was used as luminance for the  image composed of the RGB data. Images processed at 3352 x 2532 resolution. Final Image size is approximately  3352x2514.

North is up in this image.  This image  shows  LBN 639 and the surrounding nebulosity. LBN 639 is the brightest portion of the nebulosity. LBN 639 is part of the larger structure of  the MBM 3 molecular cloud which covers about 5.5x3.5 degrees of sky roughly centered about LBN 639. This region of sky is outside the galactic plane so the star field is sparse. But the distance is relatively close. There are  four PGCC molecular clouds within this field - two of which have distance estimates that place this nebulosity at about 807 to 858 light years. There are quite a few background galaxies  and a few distant quasars. These objects and some of the brighter stars are identified in the annotated image Horizonal FOV is approximately 88 arc minutes. Full size image scale is 1.57 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 01h 14m 43s Dec: +1631'18"


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