Triangulum

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For the southern constellation, see Triangulum Australe.

Triangulum
Image:Triangulum constellation map.png click for larger image
Abbreviation	Tri
Genitive	Trianguli
Symbology	Sicilia
Right ascension	2 h
Declination	30°
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	Andromeda Pisces Aries Perseus
Visible at latitudes between +90° and −60° Best visible at 21:00 (9 p.m.) 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.

1 Notable features
2 Notable deep sky objects
3 History and mythology
4 Notable and named 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.

Image:Pleiades large.jpg

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Notable and named stars

BD	F	Names and other designations	Mag.	Ly away	Comments
β	4	Beta Trianguli	3.00	124
α	2	Alpha Trianguli, Mathallah, Metallah, Ras al Mothallah, Elmuthalleth, Caput Trianguli	3.42	64.1	رأس المثلث ra´s[u] al-muθallaθ Head of the triangle
γ	9	Gamma Trianguli	4.03	118
δ	8	Delta Trianguli	4.84	35.4
	6	6 Trianguli	4.94
	14	14 Trianguli	5.15
	7	7 Trianguli	5.25
	10	10 Trianguli	5.29
	12	12 Trianguli	5.29
	15	15 Trianguli	5.38
ε	3	Epsilon Trianguli	5.50	370
	11	11 Trianguli	5.55
	13	13 Trianguli	5.89
	5	5 Trianguli	6.24