Nebula data source information
Wolfram|Alpha Knowledgebase, 2019.
Background sources and references:
Association of Universities for Research in Astronomy, Inc. The STScI Digitized Sky Survey. »
- Cox, A. N. (Ed.). Allen's Astrophysical Quantities. (4th ed.) Springer, 2000.
Davenhall, A. C. and S. K. Leggett. "Constellation Boundary Data." Strasbourg Astronomical Data Center. »
- Meeus, J. Astronomical Algorithms. (1st ed.) Willmann-Bell, 1991.
Powell, R. An Atlas of the Universe. »
- Roman, N. G. "Identification of a Constellation from a Position." Publications of the Astronomical Society of the Pacific 99, no. 617 (1987): 695-699.
- Shaya, E., J. Gass, and G. Schneider. Astronomical Data Center.
"SIMBAD Astronomical Database." Strasbourg Astronomical Data Center. »
Steinicke, W. Revised New General Catalogue and Index Catalogue. »
"VizieR Service." Strasbourg Astronomical Data Center. »
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