Mira

For other uses, see Mira (disambiguation).
Mira[1]
Location of Mira (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension 02h 19m 20.79210s[2]
Declination −02° 58′ 39.4956″[2]
Apparent magnitude (V) 2.0 to 10.1[3]
Characteristics
Spectral type M7 IIIe[4] (M5e-M9e[3])
U−B color index +0.08[5]
B−V color index +1.53[5]
Variable type Mira[3]
Astrometry
Radial velocity (Rv)+63.8[6] km/s
Proper motion (μ) RA: +9.33[2] mas/yr
Dec.: −237.36[2] mas/yr
Parallax (π)10.91 ± 1.22 mas[2]
Distanceapprox. 300 ly
(approx. 90 pc)
Absolute magnitude (MV)+0.99[7] (variable)
Orbit[8]
Period (P)497.88 yr
Semi-major axis (a)0.8″
Eccentricity (e)0.16
Inclination (i)112°
Longitude of the node (Ω)138.8°
Periastron epoch (T)2285.75
Argument of periastron (ω)
(secondary)		258.3°
Details
Mass1.18[9] M☉
Radius332–402[10] R☉
Luminosity (bolometric)8,400–9,360[10] L☉
Temperature2,918–3,192[10] K
Age6[9] Gyr
Other designations
Stella Mira, Collum Ceti, Wonderful Star,[11] ο Ceti, 68 Ceti, BD−03°353, HD 14386, HIP 10826, HR 681, LTT 1179, SAO 129825
Database references
SIMBADdata

Mira (/ˈmaɪrə/), designation Omicron Ceti (ο Ceti, abbreviated Omicron Cet, ο Cet), is a red-giant star estimated to be 200–300 light-years from the Sun in the constellation Cetus.

ο Ceti is a binary stellar system, consisting of a variable red giant (Mira A) along with a white dwarf companion (Mira B). Mira A is a pulsating variable star and was the first non-supernova variable star discovered, with the possible exception of Algol. It is the prototype of the Mira variables.

  1. ^ Cite error: The named reference IAU-CSN was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference gcvs71 was invoked but never defined (see the help page).
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  5. ^ a b Cite error: The named reference apj87 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference rgcrv was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 22 January 2017.
  9. ^ a b Cite error: The named reference apj275 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference aaa421 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference allen1963 was invoked but never defined (see the help page).