Cave Nebula SH2-155
CLICK ON IMAGE FOR FULL SIZE VIEW (2800x2115)
Scope: Mak-Newt 152 mm f/4.8, Location: Tierra Del Sol, CA, 7 August 2010 Camera: ST8300M
Exposure: 10 x 9 min H-Alpha Exposure (1x1), 10 x 6 min UV/IR Block Luminance (1x1), 7 x 3 min 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 equalized in Astroart. Central gradient was removed in Astroart. Channels were co-registered in Astroart. G2V factors were applied to color channels in Astroart. The 9 minute H-Alpha block exposures were combined with the 6 minute luminance exposures for the main luminance construction with level adjustments and curves to bring out object features. LRGB combine was done in Photoshop. Sharpening was done on the luminance channel. Final touches and color balance tweaks in Photoshop. Final Image size is approximately 3352x2532 (resized to 2800x2100).
North is up in this image. This object is referenced in two catalogues Caldwell 9 and SH2-155. It is also popularly known as the Cave Nebula. This object is located in the constellation of Cepheus. One distinctive feature is the dark area left of the bright nebula with few stars. This is a region of dust obscuring the star field behind it. The small blue reflection nebula in the lower right is on of the van den Bergh objects - vdB-155. The Cave Nebula is about 2,400 light years distant from Earth. This image replaces and earlier image that can be seen in the Archives here. Horizontal FOV is 88 arc minutes.
Image center is approximately - Equatorial 2000: RA: 22h 57m 29s Dec: +62°28'50"
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