Nebulae represent clouds of gas and dust which appear as hazy or fuzzy objects when viewed through a telescope and are
characterized as one of four types (emission, planetary, reflection or dark). Emission nebulae, such as the Lagoon
nebula (M8), simply glow, for example, with a stunning shade of red. Planetary nebulae appear as small greenish disks
through a telescope, thus emulating the planets Uranus and Neptune, as a result of gas masses being thrown off by dying
stars (ex. M27, Dumbbell nebula) or represent supernova remnants (ex. M1, Crab nebula). In contrast, reflection nebulae
are characterized with gas surrounding young stars which reflect the stellar light (ex. M45, Pleiades) and, thus, yield
beautiful images of nebulosity. Finally, dark nebulae are detectable and studied only using parts other than the visible
spectrum and are believed to be associated with the formation of stars (ex. M16 in Serpens).
Note: One of the most impressive regions of the summer sky is the large area just south of the bright star Deneb (á-Cyg, mag 1.33) and where one will find two massive emission nebulae, namely the North American Nebula (NGC 7000) and the Pelican Nebula (IC 5067 and IC 5070), separated by a thin dark dust lane. The Pelican Nebula lies at a distance of 1,900 light-years away and spans 15 light-years in diameter. It is often depicted in two forms; the larger widefield version encompasses the complete nebula and is designated as IC 5070 whereas a smaller region with protruding tendrils and near the neck of the "pelican" is also often referred to by the same name but under a different designation within the IC catalog (IC 5067). The rich emission is associated with star formation and it is expected that this area of the sky will look dramatically different in a few million years owing to a plethora of new stars and a significantly reduced amount of hydrogen.
Note: For a wider field of view of the Pelican Nebula and which is under a different code, namely IC 5070, click here.
Please click on the image below to display in higher resolution (1200 x 900)
Ced 183A, LBN 353
RA / Dec:
20h 50m 54s /
44° 25' 06"
25' x 10'
July 10, 2008
00:00 - 04:35 UT+3
AP 160 f/7.5 StarFire EDF
AP 1200GTO GEM
SBIG LRGB + IR-block