Noctua (Latin: owl) was a constellation near the tail of Hydra in the southern celestial hemisphere, but is no longer recognized.[1] It was introduced by Alexander Jamieson in his 1822 work, A Celestial Atlas, and appeared in a derived collection of illustrated cards, Urania's Mirror.[2] Now designated Asterism a, the owl was composed of the stars Sigma Librae, 4 Librae and 54–57 Hydrae, which range from 3rd to 6th magnitude.[3][4]
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The French astronomer Pierre Charles Le Monnier had introduced a bird on Hydra's tail as the constellation Solitaire, named for the extinct flightless bird, the Rodrigues solitaire, but the image was that of a rock thrush which had been classified in the genus Turdus, giving rise to the constellation name Turdus Solitarius, the solitary thrush. It has also been depicted as a mockingbird.[4] The boundaries of the constellation were defined as longitude 0° to 26°30' and from the ecliptic to 15° S.[1]
NGC 5694
editThe Noctua could be used as an observer's guide to try to detect de globular star cluster NGC 5694, of which the location is immediately west of it.
References
edit- ^ a b Bakich, Michael E. (22 June 1995). The Cambridge Guide to the Constellations. Cambridge University Press. pp. 45–47. ISBN 978-0-521-44921-2.
- ^ Kanas, Nick (5 June 2012). Star Maps: History, Artistry, and Cartography. Springer Science & Business Media. pp. 185–6. ISBN 978-1-4614-0917-5.
- ^ O'Meara, Steve (14 June 2007). Herschel 400 Observing Guide. Cambridge University Press. p. 192. ISBN 978-0-521-85893-9.
- ^ a b Ian Ridpath (1988). Star Tales. James Clarke & Co. p. 151. ISBN 978-0-7188-2695-6.
External links
edit- Ian Ridpath's Star Tales – Noctua
- Obsolete Constellations: Noctua, the owl
- Robert Goodacre (1828). A glossary: or, Explanation of the principal terms used in the sciences of astronomy and geography; with a description of the principal stars and constellations of the heavens (Fifth ed.). Sutton & Son. p. 62.