C9 Sh2-155 Cave Nebula

C9  Sh2-155 Cave Nebula

Selected by NASA for Astronomy Picture of the Day Nov 6th 2015

C9-Cave-Nebula-SII-Ha-OIII-Screen--PS3-V6--for-web 1

The Cave Nebula Sh2-155 or Caldwell 9,  is in the constellation Cepheus. It is approximately 2400 light years away, and 35 light years across. It is a dim, and diffuse bright nebula, within a larger nebula complex containing reflection, emission,  and dark nebulosity. This image is a narrowband image containing 15.5 hrs of Ha OIII SII and also Luminance added in the amount of 6.5 hrs. Total exposure time 22hrs

 FS Image



Ha 300min


OIII 300min


SII 330min


Luminance 380 min




 Scope               Planewave 17″

Camera            SBIG 11002 and AOX

Mount               Paramount ME

Filters               Astrodon  Ha5nm  OIII3nm  SII3nm   Luminance

Exposures       Ha 5hrs    OIII 5hrs   5.5SII hrs   30min subs //   Lum 6.3hrs  20min subs

Location           SRO observatories  2014




Below is an Image of C9 Cave Nebula with TMB 130mm from 2011


Sh2-155   20min Ha Subframes x 20 = 400 min combined image


Sh2-155   20min OIII  Subframes x 12 = 240 min combined image

Sh2-155   20min SII  Subframes x 15 = 300 min combined image

Scope              TMB130mm

Camera           Apogee U8300

Mount               Atlas EQG

Filters               Astrodon  Ha5nm  OIII3nm  SII3nm

Exposures       Ha 6.6hrs    OIII 4hrs   SII 5hrs   20min subs

Location           Connellsville Pa.  Home Observatory     2011

Click Here for Link to HaRGB Cave Nebula Image 

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