SH2-155 Cave Nebula

[Avdhoeven]

This image shows SH2-155, also known as the Cave Nebula, Sh2-155 or Caldwell 9, is a dim and very diffuse bright nebula within a larger nebula complex containing emission, reflection, and dark nebulosity. It is located in the constellation Cepheus.

Visually it is a difficult object, but with adequate exposure, makes a striking image. The nebula gets its name Cave Nebula from the dark lane at the eastern side abutting the brightest curve of emission nebulosity which gives the appearance of a deep cave when seen through a telescope visually.

For this image exposures were taken during 7 nights from August till October 2015. The long exposure time was necessary to get out the dark nebulae properly in my light polluted surroundings.

Telescope: TMB-92 / f/5.5

Camera: QSI 583ws

Mount: Skywatcher NEQ6

Exposures:

9x 600s R,G,B (4,5h)

23 x 600s Ha (3,8 h)

19 x 1200s Ha (6,3 h)

61 x 300s L (5,1 h)

50 x 600s L (8,3 h)

35 x 600s UHC (5,8 h)

Total: 33,8 hours

SH2-155 Cave Nebula by Andre van der Hoeven, on Flickr

[jabeoo1]

That is stunning!  I am sure it was hard work & its worked out just lovely.  I had not even heard of this until object until this image.  Congratulations. 

[MikeODay]

Fantastic image - well done and thank you for sharing.