Sh 2-117
Coordinates: (85.49°, -1.0°)
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Sh 2-117 is composed of the North American and Pelican nebulae, NGC 7000/IC 5070/IC 5067, which are visible through gaps in the Rift system of dusty giant molecular clouds that separates the Gould Belt from the Cygnus X complex.
Sh 2-117 appears to be ionised by the O5V star 2MASS J20555125+4352246. This star is heavily obscured by the dust in the Lynds dark nebula LDN 935, a Rift cloud which lies at a distance of about 520 parsecs in front of Sh 2-117, and appears to divide the North American and Pelican nebulae.
The radio source W80 appears in this direction. A 2009 paper concludes that W80 is generated only partly by Sh 2-117 and includes emission from 4 distinct sources located at different distances along the line of sight.
Only a small part of this large and relatively close region appears in this image. You can see a better image of this huge nebula here.
Sh 2-117 appears to be ionised by the O5V star 2MASS J20555125+4352246. This star is heavily obscured by the dust in the Lynds dark nebula LDN 935, a Rift cloud which lies at a distance of about 520 parsecs in front of Sh 2-117, and appears to divide the North American and Pelican nebulae.
The radio source W80 appears in this direction. A 2009 paper concludes that W80 is generated only partly by Sh 2-117 and includes emission from 4 distinct sources located at different distances along the line of sight.
Only a small part of this large and relatively close region appears in this image. You can see a better image of this huge nebula here.
The radio source W80 appears to be four distinct structures located at different distances along the line of sight. [1]
Appears to be ionised by the heavily obscured O5V star 2MASS J205551.25+435224.6 behind LDN 935 [2]
LDN 935 lies at a distance of 520 +/- 50 pc. [3]
Appears to be ionised by the heavily obscured O5V star 2MASS J205551.25+435224.6 behind LDN 935 [2]
LDN 935 lies at a distance of 520 +/- 50 pc. [3]
Notes
1. ^ Cersosimo, J. C., Muller, R. J., Figueroa Vélez, S., et al. (2007). "On the Distance and Structure of W80", The Astrophysical Journal, Vol. 656, 248-254. [2007ApJ...656..248C]
2. ^ Comerón, F. & Pasquali, A. (2005). "The ionizing star of the North America and Pelican nebulae", Astronomy and Astrophysics, Vol. 430, 541-548. [2005A&A...430..541C]
3. ^ Laugalys, V., Straižys, V., Vrba, F. J., et al. (2006). "CCD Photometry and Classification of Stars in the North America and Pelican Nebulae Region. III. The Dark Cloud L935", Baltic Astronomy, Vol. 15, 483-510. [2006BaltA..15..483L]
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Most of the sources used to create these nebula descriptions are listed in the
notes section for each description. In some cases,
for example the Avedisova, Humphreys and Reed catalogs, the source is used extensively and is not listed in the
individual nebula descriptions. See this catalog overview
for more information on the catalogs and the general sources used
to create these descriptions and this introduction to HII regions
on the general history of this area of astronomy.
This image was created using the POSS-II/UKSTU data of the Digitized Sky Survey and SuperCOSMOS using the process described here.
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and this acknowledgement taken from the DSS site:
The Digitized Sky Surveys were produced at the Space Telescope Science Institute under U.S. Government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. The plates were processed into the present compressed digital form with the permission of these institutions.
The Second Palomar Observatory Sky Survey (POSS-II) was made by the California Institute of Technology with funds from the National Science Foundation, the National Geographic Society, the Sloan Foundation, the Samuel Oschin Foundation, and the Eastman Kodak Corporation.
The UK Schmidt Telescope was operated by the Royal Observatory Edinburgh, with funding from the UK Science and Engineering Research Council (later the UK Particle Physics and Astronomy Research Council), until 1988 June, and thereafter by the Anglo-Australian Observatory. The blue plates of the southern Sky Atlas and its Equatorial Extension (together known as the SERC-J), as well as the Equatorial Red (ER), and the Second Epoch [red] Survey (SES) were all taken with the UK Schmidt.
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The "Equatorial Red Atlas" of the southern sky was made with the UK Schmidt Telescope. Plates from this survey have been digitized and compressed by the ST ScI. The digitized images are copyright ? 1992-5, jointly by the UK SERC/PPARC (Particle Physics and Astronomy Research Council, formerly Science and Engineering Research Council) and the Anglo-Australian Telescope Board, and are distributed herein by agreement.
The compressed files of the "Palomar Observatory - Space Telescope Science Institute Digital Sky Survey" of the northern sky, based on scans of the Second Palomar Sky Survey are copyright ? 1993-1995 by the California Institute of Technology and are distributed herein by agreement. The compressed files of the "Palomar Observatory - Space Telescope Science Institute Digital Sky Survey" of the northern sky, based on scans of the Second Palomar Sky Survey are copyright ? 1993-1995 by the California Institute of Technology and are distributed herein by agreement.