LBN 639 in Pisces
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CLICK ON IMAGE FOR FULL SIZE VIEW (3352x2514) 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: +16°31'18"
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