Xi Persei

Xi Persei
Menkib, ξ Per
Perseus constellation map.svg
Stars of Perseus
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 58m 57.9011s[1]
Declination +35° 47′ 27.717″[1]
Apparent magnitude (V) 4.042[1]
Spectral type O7.5IIIe[1]
U−B color index +-0.97[1]
B−V color index +0.03[1]
Variable type slightly variable
Radial velocity (Rv) 70.1[1] km/s
Proper motion (μ) RA: 1.92[1] mas/yr
Dec.: 2.30[1] mas/yr
Parallax (π) 1.84 ± 0.70[1] mas
Distance approx. 1800 ly
(approx. 500 pc)
Absolute magnitude (MV) −4.70
Mass 40 [2] M
Luminosity 330,000 [2] L
Temperature 37,000 [2] K
Rotation 216 km/s.
Age 2–3×106[2] years
Other designations
46 Per, HR 1228, HD 24912, FK5 148, SAO 56856

Xi Persei (ξ Per) is a star in the constellation Perseus. It has the traditional name Menkib (Menchib, Menkhib, Arabic for "shoulder" [of the Pleiades]). Menkib has an apparent magnitude of +4.042 and is classified as a blue giant (spectral class O7.5III). It is approximately 1800 light years from Earth.

Its apparent luminosity is 13,500 times that of the Sun. If we include the ultraviolet light that emanates from Menkib, however, its total (bolometric) luminosity increases to 330,000 times that of the Sun.

The star has a mass of some 40 solar masses and a surface temperature of 37,000 kelvins, making it one of the hottest stars that can be seen with the naked eye.


  1. ^ a b c d e f g h i j "SIMBAD query result: Menkhib -- Emission Line Star". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Menkhib. Retrieved 2010-02-08. 
  2. ^ a b c d Professor James B. (Jim) Kaler. "MENKIB (Xi Persei)". University of Illinois. http://stars.astro.illinois.edu/sow/menkib.html. Retrieved 2010-02-07. 

External links

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