Triangulum

From Biocrawler, the free encyclopedia.

For the southern constellation, see Triangulum Australe.

Triangulum
click for larger image
Abbreviation	Tri
Genitive	Trianguli
Symbology	Sicilia
Right ascension	2 h
Declination	32°
Area	132 sq. deg. Ranked 78th
Number of stars (magnitude < 3)	0
Brightest star	β Tri (App. magnitude 3.00)
Meteor showers	None
Bordering constellations	Aries Andromeda
Visible at latitudes between +90° and −58° Best visible during the month of December

Triangulum is a small northern constellation whose three brightest stars, of third and fourth magnitude, form an elongated triangle. It is one of the 88 modern constellations, and also one of the 48 listed by Ptolemy.

Contents

1 Notable features 2 Notable deep sky objects 3 History and mythology 4 Stars 5 See Also 6 External links

Notable features

Triangulum has no stars of the first magnitude. Its brightest stars are β (magnitude 3.00) and α (magnitude 3.41).

Notable deep sky objects

Triangulum is the location of the Triangulum Galaxy, M33, one of the members of the Local Group. It is 3 million light years away, and at magnitude 5.8 is sufficiently bright that it can be glimpsed with the naked eye under dark skies.

History and mythology

An early name of the constellation was Sicilia, because Ceres, patron goddess of Sicily, was claimed to have begged Jupiter that the island be placed in the heavens.

Stars

Stars with proper names:

• Mothallah [Metallah, Ras al Mothallah, Elmuthalleth] or Caput Trianguli (2/α Tri) 3.42

  < رأس المثلث ra´s[u] al-muθallaθ Head of the triangle

Stars with Bayer designations:

4/β Tri 3.00; 9/γ Tri 4.03; 8/δ Tri 4.84; 3/ε Tri 5.50

Stars with Flamsteed designations:

1 Tri 7.53; 5 Tri 6.24; 6 Tri 4.94; 7 Tri 5.25; 10 Tri 5.29; 11 Tri 5.55; 12 Tri 5.29; 13 Tri 5.89; 14 Tri 5.15; 15 Tri 5.38

See Also

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

External links

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• The Deep Photographic Guide to the Constellations: Triangulum (http://www.allthesky.com/constellations/aries/)fr:Triangle (constellation)

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Wikipedia (http://en.wikipedia.org/wiki/Main_Page) Triangulum (http://en.wikipedia.org/wiki/Triangulum) version history (http://en.wikipedia.org/w/index.php?title=Triangulum&action=history) GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License) CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)

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