Alpha Centauri

Tríréalta a bhfuil Proxima Centauri ann, an réalta is gaire don Domhan seachas ár nGrian féin. Chomh fada sin amach uainn go dtógann sé 4.3 bliain ar sholas teacht uaidh don Domhan, is é sin, tá sé 4.3 solasbhliain amach uainn. As an 6,000 réalta a bhíonn infheicthe ag an tsúil sa spéir istoíche, bíonn sé go híseal sa spéir ó dheas, agus is é an 3ú réalta ar scála na lonrachta é. Ach ní féidir é a fheiceáil in aon chor ag domhanleithead níos mó ná timpeall 28° thuaidh.^[7]

Alpha Centauri
Cineál	ilréalta, réalta threorach, triple star system (en) agus UV-emission source (en)
Cineál speictreach (réalta)	K1V[1]
Réaltbhuíon	an Ceinteár
Aois	J2000.0
Sonraí fithiseacha
Éalárnacht e	0.516
Saintréithe fisiceacha agus réaltmhéadracha
Fad ón Domhan	4.36 ly
Ga	1.227 R☉
Dearbhmhéid	4.385
Méid dhealraitheach (V)	−0.1 (banda V)[2]
Mais	1.1 M☉[3]
Teocht éifeachtach	5,781 K[4]
Saobhdhiallas	742 mas[2]
Dualghluaisne (diallas)	786 mas/y [2]
Dualghluaisne (dronairde)	−3,608 mas/y [2]
Luas gathach	−25.1 km/s[5]
Imtharraingt dromchla	18,000 cm/s²[4]
Dronairde (α)	14h 39m 29.7199s[6]
Diallas (δ)	-60° -49′ -55.999″[6]
Miotalacht	0.25[4]
Dath	U-B colour (en) = 0.23
Lonrachas	1.519 solar luminosity (en)
Cuid de	G-Cloud (en)
Le cuid	Alpha Centauri A Alpha Centauri B Proxima Centauri
Catalóga réalteolaíochta
IRAS 14359-6037 (IRAS) SAO 252838 (Smithsonian Astrophysical Observatory Star Catalog (en) ) α Cen (Bayer designation (en) ) 1ES 1435-60.6 (Einstein Slew survey, Version No. 1 (en) ) 1RXS J143940.4-605020 (1RXS (en) ) 2EUVE J1439-60.8 (The second Extreme Ultraviolet Explorer source catalog (en) ) CCDM J14396-6050AB (Catalog of Components of Double and Multiple Stars (en) ) EUVE J1439-60.8 (The first Extreme Ultraviolet Explorer source catalog (en) ) FK5 538 (FK5 (en) ) GC 19728 (Boss General Catalogue (en) ) GCRV 8519 (General Catalogue of Stellar Radial Velocities (en) ) IDS 14328-6025 AB (Index Catalogue of Visual Double Stars (en) ) LPM 534 (Luyten Proper-Motion catalogue (en) ) uvby98 100128620 (uvbyβ Photoelectric Photometric Catalogue (en) ) WDS J14396-6050AB (Washington Double Star Catalog (en) ) WDS J14403-6051AB (Washington Double Star Catalog (en) ) Ci 20 875 (Catalogue of proper motion stars (en) ) [TSA98] J143948.42-605021.66 (Initial results of a comprehensive ultrasoft survey of the Einstein IPC database: source list and confirmation of the selection procedure (en) ) RX J1439.5-6050 (X-ray survey of the Large Magellanic Cloud by ROSAT (en) ) PM 14362-6038 (Catalogs of proper-motion stars. I. Stars brighter than visual magnitude 15 and with annual proper motion of 1" or more (en) )

Alpha Centauri

Tagairtí

1. "Search for associations containing young stars (SACY). I. Sample and searching method" (as Béarla) (Nollaig 2006) (3): 695-708. doi:10.1051/0004-6361:20065602.
2. "" .
3. URL tagartha: http://adsabs.harvard.edu/abs/1994A&A...292..115A.
4. Thomas Nordlander (21 Aibreán 2016). "TheGaia-ESO Survey: Sodium and aluminium abundances in giants and dwarfs" (as Béarla): A115. doi:10.1051/0004-6361/201528014.
5. Michel Mayor (16 Aibreán 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ∼14 000 F and G dwarfs" (as Béarla) (3): 989–1019. doi:10.1051/0004-6361:20035959.
6. Thomas Nordlander (21 Aibreán 2016). "TheGaia-ESO Survey: Sodium and aluminium abundances in giants and dwarfs" (as Béarla): A115. doi:10.1051/0004-6361/201528014.
7. Hussey, Matt (2011). "Alpha Centauri". Fréamh an Eolais. Coiscéim. p. 32.

Tá an t-alt seo bunaithe ar ábhar as Fréamh an Eolais, ciclipéid eolaíochta agus teicneolaíochta leis an Ollamh Matthew Hussey, foilsithe ag Coiscéim sa bhliain 2011. Tá comhluadar na Vicipéide go mór faoi chomaoin acu beirt as ucht cead a thabhairt an t-ábhar ón leabhar a roinnt linn go léir.

Is síol é an t-alt seo. Cuir leis, chun cuidiú leis an Vicipéid. Má tá alt níos forbartha le fáil i dteanga eile, is féidir leat aistriúchán Gaeilge a dhéanamh.