Nightscapes & Deep Sky
Brian A. Morganti
Barnard-150 (Seahorse Nebula)
Barnard 150 (B150)
dark nebula is a type of interstellar cloud that is so dense that it
obscures the light from the background emission or reflection nebula
or that it blocks out background stars. The extinction of the light
is caused by interstellar dust grains located in the coldest,
densest parts of larger molecular clouds. The form of such
dark clouds is very irregular as they have no clearly defined outer
boundaries and sometimes take on convoluted serpentine shapes. The
largest dark nebulae are visible to the naked eye, appearing as dark
patches against the brighter background of the Milky Way. In the
inner regions of dark nebulae important events take place, such as
the formation of stars and masers.
B150 is also known as the Seahorse Nebula.
With a bit of imagination the dark nebula shown in the image above
roughly outlines the shape of a seahorse with its head pointing
downward as it floats in a sea of stars roughly 2 degrees wide in
the northern sky.
Date & Location:
September 11 & 12, 2012
- Bernville, PA
Weather: Calm Winds, Temperature
range 53F to 48F (11th) & 58F to 50F (12th).
11th & 12th -Clear with average transparency.
SQM-L: 11th = 20.39
start - 20.53 finish, 12th = 20:31 start - 20:55 finish
TeleVue NP101is APO Refractor with 0.8x Focal Reducer (432mm @
Filter: Hutech IDAS-LPS (Light
Mount: AstroPhysics AP900GTO
Orion SSAG @5 seconds exposures
T1i (500d) Hap Griffin modified - Baader UV/IR
x 10 minute subs @ ISO800 - 430 minutes total
exposure (7 hours 10 min)
Master Dark & Bias 50F
PS CS6, GradientXTerminator, NIK filter tools
Nebula are becoming one of my favorite images to photograph, but
they do require a large number of sub-exposures and tedious
processing in order to to show any fine details such as
tendrils. Although over 7 hours of exposures were used to
create the above image, there were at least another 2 hours that
were not used due to poor guiding or software rejection.
Nightscapes & Deep Sky Colors