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LBN 174 Region



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 18 July 2020,  Camera: ST8300M (Baader Ha LRGB filters)

Exposure:  24 x 10 min (1x1 bin) Ha filter,  10 x 4 min (1x1 bin) each RGB filters.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration and registration - PixInsight. Sub-frame integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Non-linear stretching, normalization and gradient removal - PixInsight.  Generation of starless nebulosity images - starnet++.  Starless color mapping - Ha on red;  RGB stars color - PixInsight. Stars and Starless combine - PixInsight. Final finishing  - Photoshop.  RGB calibration (for stars) - PixInsight. Annotation - PixInsight, Aladin (Simbad), and PhotoShop. This image is a  starless Ha mapping to red mapping with RGB stars added.  Images processed at 3352 x 2532 resolution. Final Image size is approximately  3000x2250.

North is up in this image.  This is an image of the emission region partially including LBN 174 with overlaps from LBN 170 and 182. For this image, the Ha emission exposure nicely outlines the dark nebula areas in this field.  This field includes dark nebulae LDN 847, 848, 849, 852, 853, and 856; Dobashi 2251 and 2255; and TGU H442 P3, H242 P5, H444 P1, and H445. Several smaller emission structures are within the image field's emission nebulosity - LBN 177, 179 and 181.There are also some open clusters - NGC 6871, IC 1310 (aka Berkeley 50), and Teutsch 8 (aka MWSC 3229)  These objects and some of the brighter stars are seen in the annotated image - the large emission nebulae - LBN 170, 174, and 182 which are only partially present in this field are omitted for clarity. An older image close up of NGC 6871 is in the Archives here. The horizontal FOV is approximately 120'. Image scale of the full size image is 2.4 arcsec/pix. 

Image center is located approximately - Equatorial 2000: RA: 20h 05m 55s Dec: +3515'42" 


All images and content remain the property of Jim Thommes - copyright 2003 - 2020

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