Deep-sky object (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Deep-sky object" in English language version.

refsWebsite

Global rank English rank

9books.google.com

3^rd place

3^rd place

5britannica.com

40^th place

58^th place

books.google.com

Fred Schaaf (1998). 40 Nights to Knowing the Sky: A Night-by-Night Sky-Watching Primer. Henry Holt and Company. p. 113. ISBN 978-0-8050-4668-7.
Ian Ridpath (2001). The Illustrated Encyclopedia of the Universe. Watson-Guptill Publications. p. 273. ISBN 978-0-8230-2512-1.
Edward W. Kolb; Rocky Kolb (1999). Blind Watchers of the Sky: The People and Ideas that Shaped Our View of the Universe. Oxford University Press. p. 174. ISBN 978-0-19-286203-7.
Charles Anthony Federer (1942). Sky and Telescope. Sky Publishing Corporation.
Fred Schaaf (1998). 40 Nights to Knowing the Sky: A Night-by-Night Sky-Watching Primer. Henry Holt and Company. p. 13. ISBN 978-0-8050-4668-7.
Grant Privett; Paul Parsons (2001). The Deep-Sky Observer's Year: A Guide to Observing Deep-Sky Objects Throughout the Year. Springer Science & Business Media. p. 11. ISBN 978-1-85233-273-0.
Rajiv Gupta (September 2004). Observer's Handbook 2005. Royal Astronomical Soc of Canada. p. 73. ISBN 978-0-9689141-8-2.
Cavin, Jerry D. (2011). The Amateur Astronomer's Guide to the Deep-Sky Catalogs. Springer New York. p. 149. ISBN 9781461406563.
W.H. Finlay (2003). Concise Catalog of Deep-sky Objects: Astrophysical Information for 500 Galaxies, Clusters and Nebulae. Springer Science & Business Media. p. 10. ISBN 978-1-85233-691-2.

britannica.com

Black hole at the Encyclopædia Britannica
Active glactic nucleus at the Encyclopædia Britannica
Nebula at the Encyclopædia Britannica
Galaxy at the Encyclopædia Britannica
Star cluster at the Encyclopædia Britannica