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Contains:  Horsehead nebula, IC 434, NGC 2023
Getting plate-solving status, please wait...
Horsehead Nebula in Ha, 


            Michael Southam
Horsehead Nebula in Ha
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Horsehead Nebula in Ha

Technical card

Dates:Jan. 29, 2016

Frames:NBPF Hydrogen-a 12nm: 11x300" bin 1x1

Integration: 0.9 hours

Darks: ~5

Avg. Moon age: 19.81 days

Avg. Moon phase: 73.88%

Basic astrometry details job: 944965

RA center: 5h 41' 0"

DEC center: -2° 27' 32"

Pixel scale: 0.724 arcsec/pixel

Orientation: 85.291 degrees

Field radius: 0.448 degrees

Resolution: 3804x2314


This is my first attempt at the Horsehead Nebula and first Ha only image. After not being able to resolve the nebula with a 5 minute luminance exposure, I turned to Ha. I was excited to see the Horsehed was easily visible in the first exposure so I kept the capture going. The final stack is 11 x 300" shots. I have had limited success using the PI Batch Reprocessing script to stack Ha frames so I decided to stack manually. The resulting image integration was noisy and star trailed. I set the Batch Reprocessing script and was pleasantly surprised when the stack worked first time.

The Horsehead Nebula (also known as Barnard 33 ) is a dark nebula in the constellation Orion. The nebula is located just to the south of the star Alnitak, which is farthest east on Orion's Belt, and is part of the much larger Orion Molecular Cloud Complex. The nebula was first recorded in 1888 by Scottish astronomer Williamina Fleming on photographic plate B2312 taken at the Harvard College Observatory. The Horsehead Nebula is approximately 1500 light years from Earth. It is one of the most identifiable nebulae because of the shape of its swirling cloud of dark dust and gases, which bears some resemblance to a horse's head when viewed from Earth.



Michael Southam
License: Attribution-NonCommercial-ShareAlike Creative Commons


  • Horsehead Nebula in Ha, 


            Michael Southam
  • Final
    Horsehead Nebula in Ha, 


            Michael Southam

Sky plot

Sky plot


Horsehead Nebula in Ha, 


            Michael Southam

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