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Sh2-132 "Lion Nebula"



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 23 July and 21, 27 August 2022,  Camera: ASI2600MM (Astronomik type 2c RGB, 6 nm Ha, OIII filters)

Exposure: Exposure: Ha - 63 x 5 min (gain-180 1x1), OIII - 64 x 5 min (gain-180 1x1) ,  RGB -20 x 2 min (gain-100 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, normalization and gradient removal - PixInsight.  Generation of starless nebulosity Ha and OIII images for later processing - Star XTerminator. Curves, Levels, stars RGB combine, stars Luminance layering - PixInsight. Color Stars and Narrow band Starless  combine - PixInsight.  Final finishing  - Affinity Photo.  Photometric RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  Bicolor narrow band image (modified HOO) with RGB stars.  Image processed at 6248x4176 resolution. Final Image size is approximately  5000x3336.

North is up in this image.  This image shows the emission nebula Sh2-132 (also known as LBN 473) .  Included are LBN 471 and Dark nebulae Barnard 369 (LDN 1150), LDN  1154, 1156, 1161, 1163, TGU H621. There are several small open clusters in this image - Berkeley 94 and NGC 7226. Just a little northeast of NGC 7226 in a small planetary nebula PN G101.5-00.6. Sh2-132 is ionized by two Wolf-Rayet stars WR 152 and 153 and some OB stars in several embedded clusters. The former (WR 152) is toward what appears to be an OIII shell in the belly of the "Lion". These stars are estimate to be 15 to 16 thousand light years distant, so Sh2-132 is in this range for distance.  These objects and some of the brighter stars are identified in the annotated imageHorizontal FOV is approximately 150 arc minutes. Full size image scale is about 1.8 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 22h 17m 42s Dec: +5542'53"


All images and content remain the property of Jim Thommes - copyright 2003 - 2022

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