is a small northern constellation
whose main stars
form a semicircular arc. It is one of the 88 modern constellations, and was also one of the 48 constellations listed by Ptolemy
, who referred to the constellation as Corona. The Borealis
added later on, to contrast with Corona Australis
, the southern crown.
It has no first magnitude stars. Its brightest star, α CrB
(Alphecca, also known as Gemma) is of magnitude 2.2 (slightly variable
) and is considered a member of the diffuse Ursa Major Moving Group
. The constellation contains several interesting variable stars: two of the best known are R Coronae Borealis
and T Coronae Borealis
Notable deep sky objects
Corona Borealis contains no bright deep sky objects. Abell 2065
is a highly concentrated galaxy cluster
containing over 400 members, the
brightest of which are of 16th magnitude
| α|| Alphecca|| Arabic|| "The broken" ring of stars |
| β|| Nusakan|| Arabic|| The two series |
| T|| Blaze Star|| English|| The star that blazes now and then |
Corona Borealis was sometimes considered to represent a crown that was given by Dionysus
, the daughter of Minos
of Crete. At other points it was considered to belong, in a sense, to Boötes
, the herdsman, or the keeper of the bears. The Cheyenne tribe called it "Camp Circle" as they arranged their camps in a semicircle.
In Welsh mythology
, the Northern Crown was called Caer Arianrhod
, ‘the Castle of the Silver Circle,’ and was the heavenly abode of the Lady Arianrhod
- Ian Ridpath and Wil Tirion (2007). Stars and Planets Guide, Collins, London. ISBN 978-0007251209. Princeton University Press, Princeton. ISBN 978-0691135564.
- Squire, C. (2000). The mythology of the British Islands: an introduction to Celtic myth, legend, poetry and romance. London & Ware: UCL & Wordsworth Editions Ltd.