Réaltnéal an Phortáin

Iarmhar réalta a chonaic réalteolaithe Síneacha ag pléascadh go mórthaibhseach i 1054, rud nár breathnaíodh san iarthar. D'ainmnigh William Parsons an réaltnéal i 1848. Léiríonn na grianghrafanna de gréasán achrannach filiméad mórthimpeall ar an néal lonrach. Ollnóva a bhí sa phléascadh seo: chaith sé amach a chisil sheachtracha agus d'fhág neodrónréalta dhlúth ag a lár, a fheictear anois mar phulsár a rothlaíonn 30 uair gach soicind.^[3]

Réaltnéal an Phortáin
Cineál	iarsma ollnóva
Fionnachtaí	John Bevis
Dáta fionnachtana	1731
Réaltbhuíon	an Tarbh
Saintréithe fisiceacha agus réaltmhéadracha
Fad ón Domhan	1.93 kpc [1]
Dearbhmhéid	−3.2
Méid dhealraitheach (V)	8.4 (banda V)
Dronairde (α)	5h 34m 31.9399s[2]
Diallas (δ)	22° 0′ 52.2″[2]
Le cuid	Pulsár an Phortáin
Catalóga réalteolaíochta
NGC	1952
M1 (réad Messier) NGC 1952 (NGC) IRAS 05314+2200 (IRAS) 1ES 0532+21.5 (Einstein Slew survey, Version No. 1 (en) ) NVSS J053428+220202 (NRAO VLA Sky Survey (en) ) 2C 481 (Second Cambridge Catalogue of Radio Sources (en) ) 3C 144 (Third Cambridge Catalogue of Radio Sources (en) ) 3C 144.0 (Third Cambridge Catalogue of Radio Sources (en) ) 4C 21.19 (Fourth Cambridge Survey (en) ) LBN 833 (Lynds' Catalogue of Bright Nebulae (en) ) LBN 184.62-05.65 (Lynds' Catalogue of Bright Nebulae (en) ) SH 2-244 (A catalogue of HII regions (en) ) 3FHL J0534.5+2201 (3FHL: The Third Catalog of Hard Fermi-LAT Sources (en) ) 2U 0531+22 (The UHURU catalog of X-ray souces (en) ) 3A 0531+219 (The Ariel V (3A) catalogue of X-ray sources - II. Sources at high galactic latitude ( b > 10 ) (en) ) 3CR 144 (The revised 3C catalogue of radio sources (en) ) 3U 0531+21 (The third UHURU catalog of X-ray sources (en) ) 4U 0531+21 (The fourth UHURU catalog of X-ray sources (en) ) AJG 1 (The structure of the Milky Way. I. A radio continuum survey of the galactic plane at 408 MHz (en) ) CTB 18 (A survey of galactic radiation at 960 MC/S (en) ) PKS 0531+219 (The Parkes catalogue of radio sources. Declination zone +20 to +27 (en) ) VRO 21.05.01 (A 610.5 MHz survey of the sky between declinations +40 and +44 degrees (en) ) [DGW65] 25 (A catalogue of discrete sources observed at 400 Mc/s (en) ) PBC J0534.5+2201 (The Palermo Swift-BAT hard X-ray catalogue. II. Results after 39 months of sky survey (en) ) ARGO J0535+2203 (TeV GAMMA-RAY SURVEY OF THE NORTHERN SKY USING THE ARGO-YBJ DETECTOR (en) ) 3FGL J0534.5+2201i (Fermi Large Area Telescope third source catalog (en) )

Tagairtí

1. Virginia Louise Trimble (Deireadh Fómhair 1973). "The Distance to the Crab Nebula and NP 0532" (as Béarla): 579–585. doi:10.1086/129507.
2. "VLBI imaging of a flare in the Crab nebula: more than just a spot" (as Béarla) (2011): 10–10. doi:10.1051/0004-6361/201117082.
3. Hussey, Matt (2011). "Réaltnéal an Phortáin". Fréamh an Eolais. Coiscéim. p. 534.

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.