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Corona australis
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Abbreviation	CrA
Genitive	Coronae Australis / Coronae Austrinae
Symbology	The Southern Crown
Right ascension	19 h
Declination	−40°
Area	128 sq. deg. Ranked 80th
Number of stars (Bayer-Flamsteed)	13
Number of bright stars (magnitude < 3)	0
Number of nearby stars (Distance < 100 ly)	0
Brightest star	α CrA (App. magnitude 4.1)
Nearest Star	α CrA (Distance: 130 ly)
Meteor showers	Beta Corona Austrinids
Bordering constellations	Sagittarius Scorpius Ara Telescopium
Visible at latitudes between +40° and −90° Best visible at 21:00 (9 p.m.) during the month of August

Corona Australis (IPA: /kəˈrəʊnə ˌɒsˈtrɑːlɪs/) or Corona Austrina (IPA: /ˌɒsˈtriːnə/, Latin: southern crown) was one of Ptolemy's 48 constellations, and also counts among the 88 modern constellations. The name contrasts with Corona Borealis.

Contents 1 History 2 Naming mixup 3 Stars 4 References 5 External links

[edit] History

The constellation was sometimes considered to be the crown of Sagittarius, which had fallen on the ground for some reason.

[edit] Naming mixup

In 1932 the International Astronomical Union officially changed the name of this constellation to "Corona Austrina" (with genitive "Coronae Austrinae"). This may have been due to an inadvertent naming mixup which has never been corrected [1], but in any case the official IAU website continues to list "Corona Austrina" as the official name [2]. In practice, the original name "Corona Australis" continues to be more widely used.

[edit] Stars

Stars with proper names:

• (α CrA) 4.11 Alphekka Meridiana [Alfecca Meridiana]

  < فكّة al-fakkah The broken (ring of stars)

Stars with Bayer designations:

β CrA 4.10; γ CrA – double 4.23, 4.99; δ CrA 4.57; ε CrA 4.83; ζ CrA 4.74; η¹ CrA 5.46; η² CrA 5.60; θ CrA 4.63; κ¹ CrA 6.31; κ² CrA 5.67; λ CrA 5.11; μ CrA 5.20

Other notable stars:

• R CrA 11.50 – variable

[edit] References

• The Cambridge Guide to the Constellations, Michael E. Bakich, Cambridge University Press, 1995, pg. 85

Constellations changed by Johann Bayer in the 1603 text Uranometria

Centaurus | split into | Centaurus | Crux

Leo | split into | Leo | Coma Berenices

Piscis Austrinus | split into | Piscis Austrinus | Grus

Sagittarius | split into | Sagittarius | Corona Australis

Constellations changed by Lacaille in 1763

Argo Navis split into Carina | Puppis | Vela

Eridanus split into Eridanus | Fornax

Sagittarius | Corona Australis altered to create Telescopium

Centaurus | Lupus altered to create Circinus

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

• Corona Australis photo - [3]

ca:Corona Austral

cs:Jižní koruna (souhvězdí) da:Sydlige Krone de:Südliche Krone (Sternbild) es:Corona Australis eo:Aŭstrala Krono (konstelacio) fr:Couronne australe ga:Coróin an Deiscirt ko:남쪽왕관자리 hr:Južna kruna it:Corona Australe (costellazione) la:Corona Australis (sidus) lt:Pietų Vainikas hu:Déli Korona csillagkép nl:Zuiderkroon ja:みなみのかんむり座 nn:Sørlege krone pl:Korona Południowa pt:Corona Australis ru:Южная Корона (созвездие) sk:Súhvezdie Južná koruna fi:Etelän kruunu sv:Södra kronan th:กลุ่มดาวมงกุฎใต้ tr:Corona Australis (takımyıldız) zh:南冕座