LDN 1357 vdB7 and vdB9 in Cassiopeia
CLICK ON IMAGE FOR FULL SIZE VIEW (1800 x 1350)
Scope: ES "Levy" MN152 Mak-Newt, 152 mm at f/4.8, Location: Laguna Mountains, CA 21 September 2011, Camera: ST8300M
Exposure: 16 x 9 minutes IR/UV Block (1x1 bin), 8 x 4 minutes RGB Exposures (2x2)
Processing: Images were captured with CCDSoft. Aligned/stacked and dark subtracted in Astroart ; Sigma Combine method was used for stacking subs. All channels were scaled and rough color balanced in Astroart. Central Gradient removal was done in Astroart. Channels were co-registered in Astroart. The 9 minute 1x1 exposures were combined for the main luminance construction . Level adjustments and curves were used to bring out object features. LRGB combine was done in Photoshop. A light background noise reduction was applied in PixInsight LE (SGBNR) and with surface smoothing in Photoshop. Final touches and color balance in Photoshop. Final Image size is approximately 3352x2532 (resized to 1800x1350).
All exposures in this image were guided; North is to the right in this image. This is a region of gas and dust. The main dark cloud in this image is LDN 1357. Objects in this field are vdB9 / LBN 643, LDN 1355, and. LDN 1358 (upper right). In the lower right is vdB 7 around the star bright star HD 17138. The distance from Earth to HD 17138 is about 203 light years. The Horizontal FOV is 80'.
Image center is located approximately - Equatorial 2000: RA: 02h 53m 44s Dec: +69°06'04"
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