LBN 7 and LDN 43
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CLICK ON IMAGE FOR FULL SIZE VIEW (2800x2100) 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: -15°47'09"
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