Corona Borealis
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| Corona borealis | |
|---|---|
 click for larger image | |
| Abbreviation | CrB |
| Genitive | Coronae Borealis |
| Symbology | The Northern Crown |
| Right ascension | 16 h |
| Declination | +30° |
| Area | 179 sq. deg. Ranked 73rd |
| Number of stars | 22 |
| Number of bright stars
(magnitude < 3) | 1 |
| Number of nearby stars
(Distance < 100 ly) | 2 |
| Brightest star | (α CrB) (Alphecca or Gemma) (App. magnitude 2.2) |
| Nearest Star | ρ CrB (Distance: 56.81 ly) |
| 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 (IPA: /kəˈrəʊnə ˌbɒriˈɑːlɪs/, Latin: 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.
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[edit] Notable features
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.
[edit] 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.
[edit] Mythology
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.
[edit] Stars
- Stars with proper names:
- (5/α CrB) 2.22 Alphecca [Alphacca, Alphekka] or Gemma or Gnosia [Gnosia Stella Coronae] or Asteroth [Ashtaroth]
- < النائر الفكّة an-na´ir al-fakkah The bright one of the broken (ring of stars)
- < gemma The jewel
- < gnōsia stella corōnæ Star of Ariadne's ("of Knossos's") crown
- < עשתרות cašterôt, Astarte (idols) [plural of Ashtoreth Astarte/Ishtar, the Semitic fertility goddess]
- (5/α CrB) 2.22 Alphecca [Alphacca, Alphekka] or Gemma or Gnosia [Gnosia Stella Coronae] or Asteroth [Ashtaroth]
- (3/β CrB) 3.66 Nusakan
- < ? an-nasaqan The (two) series
- (3/β CrB) 3.66 Nusakan
- Stars with Bayer designations:
- 8/γ CrB 3.81; 10/δ CrB 4.59; 13/ε CrB 4.14; 7/ζ1 CrB 6.00; 7/ζ2 CrB 5.07; 2/η CrB – double 4.99, 6.08; 4/θ CrB 4.14; 14/ι CrB 4.98; 11/κ CrB 4.79; 12/λ CrB 5.43; 6/μ CrB 5.14; 20/ν1 CrB 5.20; 21/ν2 CrB 5.40; 19/ξ CrB 4.86; 1/ο CrB 5.51; 9/π CrB 5.57; 15/ρ CrB 5.39 – has a planet; 17/σ CrB – double 5.23, 6.66; 16/τ CrB 4.73; 18/υ CrB 5.80
- Other notable stars:
- R CrB 5.85 - 14.8 – R CrB variable prototype
| The 48 Constellations listed by Ptolemy |
|---|
| Andromeda • Aquarius • Aquila • Ara • Argo Navis • Aries • Auriga • Boötes • Cancer • Canis Major • Canis Minor • Capricornus • Cassiopeia • Centaurus • Cepheus • Cetus • Corona Australis • Corona Borealis • Corvus • Crater • Cygnus • Delphinus • Draco • Equuleus • Eridanus • Gemini • Hercules • Hydra • Leo • Lepus • Libra • Lupus • Lyra • Ophiuchus • Orion • Pegasus • Perseus • Pisces • Piscis Austrinus • Sagitta • Sagittarius • Scorpius • Serpens • Taurus • Triangulum • Ursa Major • Ursa Minor • Virgo |
| The 88 modern Constellations |
|---|
| Andromeda • Antlia • Apus • Aquarius • Aquila • Ara • Aries • Auriga • Boötes • Caelum • Camelopardalis • Cancer • Canes Venatici • Canis Major • Canis Minor • Capricornus • Carina • Cassiopeia • Centaurus • Cepheus • Cetus • Chamaeleon • Circinus • Columba • Coma Berenices • Corona Australis • Corona Borealis • Corvus • Crater • Crux • Cygnus • Delphinus • Dorado • Draco • Equuleus • Eridanus • Fornax • Gemini • Grus • Hercules • Horologium • Hydra • Hydrus • Indus • Lacerta • Leo • Leo Minor • Lepus • Libra • Lupus • Lynx • Lyra • Mensa • Microscopium • Monoceros • Musca • Norma • Octans • Ophiuchus • Orion • Pavo • Pegasus • Perseus • Phoenix • Pictor • Pisces • Piscis Austrinus • Puppis • Pyxis • Reticulum • Sagitta • Sagittarius • Scorpius • Sculptor • Scutum • Serpens • Sextans • Taurus • Telescopium • Triangulum • Triangulum Australe • Tucana • Ursa Major • Ursa Minor • Vela • Virgo • Volans • Vulpecula |
[edit] External links
cs:Severní koruna (souhvězdí) co:Corona Borealis da:Nordlige Krone de:Nördliche Krone (Sternbild) el:Στέφανος Βόρειος es:Corona Borealis eo:Boreala Krono (konstelacio) fr:Couronne boréale hr:Sjeverna kruna ga:Coróin an Tuaiscirt ko:북쪽왕관자리 it:Corona Boreale (costellazione) la:Corona Borealis (sidus) lt:Šiaurės Vainikas hu:Északi Korona csillagkép nl:Noorderkroon ja:かんむり座 nn:Nordlege krone pl:Korona Północna pt:Corona Borealis ro:Coroana Boreală (constelaţie) ru:Северная Корона (созвездие) sk:Súhvezdie Severná koruna fi:Pohjan kruunu sv:Norra kronan th:กลุ่มดาวมงกุฎเหนือ tr:Corona Borealis (takımyıldız) uk:Північна Корона (сузір'я) zh:北冕座
