Cave nebula (Sh2-155) in Hubble palette

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 and is approximately 2400 light years from Earth.

 

Details

M: Mesu 200

T: TMB 152/1200

C: QSI690-wsg with 3nm NB filters

 

35x1800s Ha

35x1800s OIII

35x1800s SII

 

52hrs and 30 minutes total exposure time

Done