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Corona Borealis facts for kids

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Corona Borealis
Abbreviation CrB
Genitive Coronae Borealis
Pronunciation genitive
Symbolism The Northern Crown
Right ascension 15h 16m 03.8205s–16h 25m 07.1526s
Declination 39.7117195°–25.5380573°
Area 179 sq. deg. (73rd)
Main stars 8
Stars with planets 4
Stars brighter than 3.00m 4
Stars within 10.00 pc (32.62 ly) 0
Brightest star α CrB (Alphecca or Gemma) (2.21m)
Nearest star HD 144579
(46.86 ly, 17.25 pc)
Messier objects 0
Meteor showers None
Visible at latitudes between +90° and −50°.
Best visible at 21:00 (9 p.m.) during the month of July.

Corona Borealis 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 (northern) was added later on, to contrast with Corona Australis, the southern crown.

Notable features

Abell2142 chandra xray
X-ray image of galaxy cluster Abell 2142

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.


Corona Borealis was sometimes considered to represent a crown that was given by Dionysus to Ariadne, 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" and arranged their camps in a semicircle.

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