SH2-170, the Little Rosette Nebula

Sharpless 170 (SH2-170) is an emission nebula located in the constellation Cassiopeia, a few degrees north of Caph. About 20 x 20 arcminutes across, it is called “Little Rosette” thanks to its resemblance to the real Rosette Nebula in the constellation Monoceros.

The photo coming with this post comes from raw data dating back a few years (2017), acquired with my Moravian G2-8300 CCD camera.

This nebula emits its light mostly in the H-alpha band and, to a smaller extent, its core also shines in the OIII band, which is not visible in my image because I didn’t use an OIII filter back then. Anyway, as the raw frames looked quite promising, I decided to process them. In my opinion, the final result is not too bad.

This one is an Ha:R:G:B composite from 51:10:7:7 subs (15 minutes for H-alpha, 10 minutes for broadband), for a total of a bit less than 17 hours acquired over two nights, 17 and 18 November 2017 through a TS 130/900 refractor.

Hope you like it! 🙂