StormEffects

Nightscapes & Deep Sky Colors

Astrophotography Brian A. Morganti


 Barnard B92 & B93 - Dark Nebula

Dark Nebula & Star Cluster NGC6603

 Sagittarius

 

Barnard Dark Nebula B92 (right) & B93 (left) are dark nebula caused by dense obscuring dust blocking light from more distant stars behind them. B92 is very dense and opaque. A lone 12th-magnitude star seems to be visible inside of M92, but it is really in the foreground. B92 is located at a distance of 10,000 light-years. B92 is sometimes called the Black Hole.

B93 is much more mottled in appearance. It is also located 10,000 light-years away.  Both B92 and B93 were cataloged by E. E. Barnard in 1913.  The small star cluster in the lower left in NGC 6603. These three objects are estimated to all be 10,000 light years distant from Earth. The general pinkish-reddish hue is the larger emission nebula known as Sharpless 41.

North is to the top in the above image.

IMAGE DETAILS:

  • Date & Location:  July 27/28, 2016 - StarEffects Observatory, Bernville. PA

  • Weather:  Calm winds, average temp of 70F

  • Sky Conditions:  Clear with Above Average Transparency - Average Transparency at finish. 

  • SQM-L:  Start to Finish 20:45 - 20:56

  • Optics:  TeleVue NP101is 540mm w/Field Flattener @ f5.4

  • Filter:  Astronomic  EOS clip-in CLS (Light Pollution Suppression)

  • Mount:  AP900GTO

  • Guiding:  TeleVue TV60is - Orion Star Shoot AG - 5 second exp - excellent graph

  • Camera:  Canon TIi  Hap Griffin modified - Baader UV/IR

  • Exposure:  27 x 5min @ ISO800  (total 2 hours 15 min)

  • Calibration Frames:  Darks, Bias 70F - 10 Flats acquired w/Alnitak Flat Man

  • Processing:    Images Plus 5.75a, PS CS6, GradientXTerminator, NIK filter tools 

  • Comments:  A seldom photographed DSO with only a few images found on the internet, no doubt due to several nearby well known objects just above the "teapot" in Sagittarius.  Dark Nebula continue to be one of my favorite targets and this one stands out well against the bright star field of the Milky Way.

Astrophotography  -  Nightscapes & Deep Sky Colors

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