Mira

Mira
Cineál	déréalta, réalta ard-dualghluaisne, réalta líne astúcháin, foinse fho-mhilliméadrach, méasar réaltfhisiceach agus foinse infridhearg
Cineál speictreach (réalta)	M5-9IIIe+DA
Fionnachtaí	David Fabricius
Dáta fionnachtana	13 Lúnasa 1596
Réaltbhuíon	an Míol Mór
Aois	J2000.0
Saintréithe fisiceacha agus réaltmhéadracha
Fad ón Domhan	92 pc
Méid dhealraitheach (V)	6.53 (banda V)
Mais	1.2 M☉
Teocht éifeachtach	3,000 K
Saobhdhiallas	10.91 mas
Dualghluaisne (diallas)	−237.36 mas/y
Dualghluaisne (dronairde)	9.33 mas/y
Luas gathach	63.5 km/s
Dronairde (α)	2h 19m 20.7921s
Diallas (δ)	-2° -58′ -39.4956″
Aois measta	6 gigaannum (en)
Le cuid	Mira A; Mira B
Catalóga réalteolaíochta
	GSC 04693-01144 (Guide Star Catalog (en) ); HD 14386 (catalóg Henry Draper); HIP 10826 (Hipparcos Catalogue (en) ); HR 681 (Bright Star Catalogue (en) ); IRAS 02168-0312 (IRAS); SAO 129825 (Smithsonian Astrophysical Observatory Star Catalog (en) ); AAVSO 0214-03 (American Association of Variable Star Observers (en) ); ADS 1778 AP (Aitken Double Star Catalogue (en) ); 2MASS J02192081-0258393 (2MASS); ASAS J021920-0258.6 (All Sky Automated Survey (en) ); BD-03 353 (Durchmusterung (en) ); CCDM J02194-0258AP (Catalog of Components of Double and Multiple Stars (en) ); CSI-03 353 1 (Catalog of Stellar Identifications (en) ); GC 2796 (Boss General Catalogue (en) ); GCRV 1301 (General Catalogue of Stellar Radial Velocities (en) ); HIC 10826 (Hipparcos Input Catalogue (en) ); IRC +00030 (Two-Micron Sky Survey (en) ); JP11 625 (JP11 (en) ); LTT 1179 (Luyten Two-Tenths catalogue (en) ); NLTT 7657 (New Luyten Two-Tenths catalogue (en) ); PLX 477 (General Catalogue of Trigonometric Stellar Parallaxes (en) ); PLX 477.00 (General Catalogue of Trigonometric Stellar Parallaxes (en) ); PPM 184482 (PPM Star Catalogue (en) ); RAFGL 318 (The Revised AFGL (RAFGL) catalogue (en) ); TD1 1361 (TD1 Catalog of Stellar Ultraviolet Fluxes (en) ); TYC 4693-1144-1 (Tycho Catalogue (en) ); UBV 21604 (UBV Photoelectric Photometry Catalogue (en) ); UCAC3 175-6614 (Third USNO CCD Astrograph Catalog (en) ); UCAC4 436-002922 (Fourth USNO CCD Astrograph Catalog (en) ); omi Cet (General Catalogue of Variable Stars); WDS J02193-0259Aa,Ab (Washington Double Star Catalog (en) ); YZ 93 562 (Yale Observatory Zone Catalog (en) ); DO 430 (Dearborn Observatory Catalogue (en) ); ASAS J021921-0258.8 (All Sky Automated Survey (en) ); [LFO93] 0216-03 (CO and HCN observations of circumstellar envelopes. A catalogue - mass loss rates and distributions (en) ); WEB 2282 (Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Radial velocities: The Wilson-Evans-Batten catalogue (en) ); ο Cet (Bayer designation (en) ); 68 Cet (Flamsteed designation (en) )

Réalta i réaltbhuíon an Mhíl Mhóir a ndearnadh taifeadadh uirthi den chéad uair i 1596, ach a aithníodh mar réalta athraitheach i 1638. Fathachréalta dhearg a athraíonn le tréimhse 331 lá ó mhéid 10 suas go dtí 2. Bhain sí méid 1.2 amach i 1779, i measc an 20 réalta is gile sa spéir. Is í an chéad shampla de réaltaí ar leith iad athraithigh Mira, réaltaí athraitheacha fadtréimhseacha le tréimhsí chomh fada le míonna nó níos mó.^[8]