Sharpless 2-140 Nebula in Cepheus (Jeff Husted)

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Sharpless 2-140 Nebula in Cepheus

This nebula is along the northeast circumference of a very large molecular cloud called the Cepheus Bubble. This is a bubble of gas and dust that is around 500 light years across and approximately 2700 light years away. From our vantage point on earth, this bubble extends across 10 degrees of sky! The bubble was formed only 10-20 million years ago inside one of the outer spiral arms of our galaxy. Stars in the center of the bubble formed and the most massive ones quickly exploded marking the origin of this molecular cloud. The subsequent compression wave of gas triggered new star formation- especially along the edges of the bubble where the gas is most dense. SH2-140 is one such region (credit NOAO.edu). A faint reflection nebula is visible to the right of SH2-140 near the blue star HR 8490. I can't find any details on it. Vdb 153 can be seen at the very bottom left of center. Imaging Details: Televue NP127is f5.2 refractor at f4.2 with TV focal reducer; Atik 383L+ at -18 deg C; Orion EQ-G mount;TS OAG; Astrodon E series LRGB filters & 3nm Ha filter: 6 hours Ha; 3.5 hours Luminance; 60/60/120 minutes R/G/B. Total exposure: about 13.5 hours over three nights in August 2014 at Grandview. Processed with Images Plus; Maxim DL; Photoshop; EasyHDR. Thanks for looking!

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Sharpless 2-140 Nebula in Cepheus

Sharpless 2-140 Nebula in Cepheus

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Sharpless 2-140 Nebula in Cepheus

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