Triangulum

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For the southern constellation, see Triangulum Australe.

Triangulum
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Abbreviation	Tri
Genitive	Trianguli
Symbology	The Triangle
Right ascension	2 h
Declination	30°
Area	132 sq. deg. Ranked 78th
Number of main stars	3
Number of stars (Bayer-Flamsteed)	14
Number of stars with planets (BF, variable, other stars)	0, 1
Number of bright stars (magnitude < 3)	0
Number of nearby stars (Distance < 100 ly)	2
Brightest star	β Tri (4 Tri) (App. magnitude 3.00)
Nearest Star	δ Tri (8 Tri) (Distance: 35.4 ly)
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 (IPA: /trʌɪˈaŋgjələm/) 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

[edit] Notable features

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

[edit] Notable deep sky objects

Triangulum is the location of the Triangulum Galaxy, M33, one of the members of the Local Group. It is 2.4 million light years away, and at magnitude 5.8 is sufficiently bright that it can be glimpsed with the naked eye under dark skies.

[edit] 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.

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[edit] 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	480