Corona Borealis
Encyclopedia : C : CO : COR : Corona Borealis
| Corona borealis | |
|---|---|
| |
| Abbreviation | CrB |
| Genitive | Coronae Borealis |
| Symbology | The Northern Crown |
| Right ascension | 16 h |
| Declination | +30° |
| Area | List of constellations by area>Ranked 73rd |
| Number of stars (magnitude < 3) | 1 |
| Brightest star | α CrB) (Alphecca or Gemma) (Apparent magnitude>App. magnitude 2.2) |
| Meteor showers | None |
| Bordering constellations | |
| Visible at latitudes between +90° and −50° Best visible at 21:00 (9 p.m.) during the month of July | |
|
Corona Borealis (Latin for northern crown) 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 featuresIt 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 objectsCorona 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.MythologyCorona 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.Stars
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