Triangulum
From Wikipedia, the free encyclopedia
- For the southern constellation, see Triangulum Australe.
| Triangulum | |
|---|---|
 click for larger image | |
| Abbreviation | Tri |
| Genitive | Trianguli |
| Symbology | The Triangle |
| Right ascension | 2 h |
| Declination | 30° |
| Area | 132 sq. deg. Ranked 78th |
| Number of stars | 14 |
| Number of bright stars
(magnitude < 3) | 0 |
| Number of nearby stars
(Distance < 100 ly) | 2 |
| Brightest star | β Tri (App. magnitude 3.00) |
| Nearest Star | δ Tri (Distance: 35.4 ly) |
| 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 (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.
Contents |
[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.
[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 |
|
| 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
[edit] See also
| 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
cs:Trojúhelník (souhvězdí) co:Triangulum da:Trekanten de:Dreieck (Sternbild) el:Τρίγωνον es:Triangulum eo:Triangulo (konstelacio) fr:Triangle (constellation) ga:An Triantán hr:Trokut (zviježđe) ko:삼각형자리 it:Triangolo (costellazione) la:Triangulum (sidus) lt:Trikampis (astronomija) hu:Északi Háromszög csillagkép nl:Driehoek (sterrenbeeld) ja:さんかく座 nn:Det sørlege triangelet pl:Trójkąt (gwiazdozbiór) pt:Triangulum ru:Треугольник (созвездие) sk:Súhvezdie Trojuholník fi:Kolmio (tähdistö) sv:Triangeln (stjärnbild) th:กลุ่มดาวสามเหลี่ยม tr:Triangulum (takımyıldız) zh:三角座
