Sh2-155, The Cave Nebula in Cepheus

Posted by Rod Pommier
on Wednesday, September 4, 2019
Sh2-155 is a faint nebula in the constellation Cepheus that is nicknamed the Cave Nebula.
It is one of the rare regions in the sky that show red emission, blue reflection, and dark nebulosity in the same view. It lies 2,400 light-years from Earth.

Image Data:
Telescope/mount: Celestron Compustar C14 with Starizona LF reducer/corrector (f/7.5)
Camera: SBIG STL 11000 with Baader Planetarium Ha, R, G, and B filters
SBIG AO-L adaptive optics at 3 Hz
Location: Pommier Observatory, Portland, OR, USA
Dates: 2017-09-23 through 2017-10-02
Exposures: Ha:R:G:B = 900:95:95:90 = 19 hours 40 minutes total exposure

See additional astrophotographs at
To leave a comment you must be a member of our community.
Login to your account now, or register for an account to start participating.
No one has commented yet.
Join our Community!

Our community is FREE to join. To participate you must either login or register for an account.


Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. View our Privacy Policy.

Find us on Facebook