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LBN 7 and LDN 43



Scope: Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 19 December 2019,  Camera: ST8300M (Baader LRGB filters)

Exposure: Exposure: 24 x 9 min  (1x1 bin) exposure with UV/IR block filter,  10 x 4 min (2x2 bin) each RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Subframe calibration - Pixinsight. Subframe  registration and integration (Median 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 - eXcalibrator. Annotation - PixInsight, Aladin (Simbad and NED), and PhotoShop. This image is a  RGB combine with Luminance layering.  Images processed at 3352 x 2532 resolution. Final Image size is approximately  2800x2100.

North is up in this image.  This image shows a region of interstellar material and dust illuminated by nearby stars as well as dark nebulae of dust blocking the light from background stars. The illuminated dust structure is LBN 7; the dark nebulae are Dobashi 74 and LDN 43. There are four parts to LDN 43 (plus S, D, and E). The annotated image doesn't  indicate these four separately - just the overall structure. Within the LDN and LBN structure are two cometary nebulae GN 16.311.3 and GN 16.31.7.  A cometary nebula is a descriptive term for these and similar nebulae since the nebula has the shape of a comet.  There are several background galaxies in the image (6dF J1634296-152207, 6dF J1633551-153149, 2MFGC 13265, and others). These objects and some of the brighter stars are identified in the annotated image. Horizontal FOV is approximately 88 arc minutes. Full size image scale is 1.89 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 16h 35m 02s Dec: -1547'09"


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