Triangulum

Encyclopedia : T : TR : TRI : Triangulum

For the southern constellation, see Triangulum Australe.

Triangulum


 click for larger image

Abbreviation

Tri

Genitive

Trianguli

Symbology

Sicilia

Right ascension

2 h

Declination

30°

Area

List of constellations by area>Ranked 78th

Number of stars
(magnitude < 3)

Brightest star

β Tri
(Apparent magnitude>App. magnitude 3.00)

Meteor showers

None

Bordering
constellations

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.

Contents

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 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.

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.

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

Source: The Bright Star Catalogue, 5th Revised Ed., The Hipparcos Catalogue, ESA SP-1200

External links

Wikimedia Commons has media related to:

[Special]

[The Deep Photographic Guide to the Constellations: Triangulum]

From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.

Triangulum

Notable features

Notable deep sky objects

History and mythology

Notable and named stars

See also

External links