Daily Archives: February 17, 2014
The Cosmic Web of the Tarantula Nebula
Image Credit & Copyright: Damian Peach
NASA APOD 17-Feb-2014
NGC 7000: North American Complex
The North America Nebula (NGC 7000 or Caldwell 20) is an emission nebula in the constellation Cygnus, close to Deneb (the tail of the swan and its brightest star). The remarkable shape of the nebula resembles that of the continent of North America, complete with a prominent Gulf of Mexico. It is sometimes incorrectly called the “North American Nebula”.
The North America Nebula is large, covering an area of more than four times the size of the full moon; but its surface brightness is low, so normally it cannot be seen with the unaided eye. Binoculars and telescopes with large fields of view (approximately 3°) will show it as a foggy patch of light under sufficiently dark skies. However, using a UHC filter, which filters out some unwanted wavelengths of light, it can be seen without magnification under dark skies. Its prominent shape and especially its reddish color (from the hydrogen Hα emission line) show up only in photographs of the area.
Imaging telescopes or lenses: Takahashi CCA-250
Mounts: Software Bisque Paramount ME
Guiding cameras: SBIG STi
Focal reducers: Takahashi 645 Reducer QE 0.72X
Software: PixInsight, MaximDL 5
Filters: Astrodon Ha 3nm, Astrodon 3nm SII, Astrodon 3nm OIII
Dates: Oct. 7, 2013
Integration: 4.0 hours
Autor: Craig Prost
AstroPhotography of the day by SPONLI
17 February 2014
We select the best works of amateur astrophotographers with details of equipment, shooting processing etc.