Antilhue - Chile

Horsehead and NGC 2023
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Image Data

Designation IC 434 (top), B33 (Horsehead Nebula),  NGC 2023 (bottom left)
Constellation Orion  (Ori)
Coordinates 05 h 41 min   -02° 28'
Description The Horsehead nebula (B33) is actually a dark interstellar cloud in our Milky Way that obscures part of a bright red emission nebula. This is IC 434 which is excited by bright Alnitak (Zeta Ori) just outside the field on the left (north). The blue reflection nebula NGC 2023 shines at lower left.  Reflections from Sigma Orionis were incorporated in the image layout as 'cosmic spotlights' to highlight the two main objects in the frame. 

Click on the image for a higher resolution view and here for a close-up of the Horsehead in native resolution.  The field of view is approx. 25' x 37'.  Link to an earlier image with a 6" refractor.

Exposure NRGB 220:75:75:75 min @ -25°C, RGB binned 2x2
Camera SBIG STL-11000 selfguided, Astronomik Type II RGB Filterset
Optics RCOS 14.5" Ritchey-Chrétien @ f/9 (prime focus)
Mount Astro-Physics AP1200GTO
Software MaxIm DL/CCD,  Sigma Pre Beta 11, Registar, Adobe Photoshop CS
Location - Date - Time San Esteban (Chile) - 30/31Oct2005 - 07:00 UTC 
Conditions Transparency 7/10,  Seeing 7/10, Temperature +11°C