Alpha Lupi

Alpha Lupi
Location of α Lupi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Lupus
Right ascension 14h 41m 55.75579s[1]
Declination –47° 23′ 17.5155″[1]
Apparent magnitude (V) 2.30[2] (2.29 - 2.34[3])
Characteristics
Spectral type B1.5 III[4]
U−B color index –0.88[2]
B−V color index –0.20[2]
Variable type β Cep[3]
Astrometry
Radial velocity (Rv)+5.4 ± 0.6[5] km/s
Proper motion (μ) RA: −20.94[1] mas/yr
Dec.: −23.67[1] mas/yr
Parallax (π)7.02 ± 0.17 mas[1]
Distance460 ± 10 ly
(142 ± 3 pc)
Absolute magnitude (MV)−4.3[6]
Details
Mass10.1 ± 1.0[7] M☉
Radius7.46 ± 0.17[8][a] R☉
Luminosity18,200+860
−820[8] L☉
Surface gravity (log g)3.46[6] cgs
Temperature24,550[8] K
Metallicity [Fe/H]0.04[9] dex
Rotational velocity (v sin i)9.5[8] km/s
Age16–20[5] Myr
Other designations
CD-46°9501, FK5 541, HD 129056, HIP 71860, HR 5469, SAO 225128[10]
Database references
SIMBADdata

Alpha Lupi (α Lupi, α Lup) is a blue giant star, and the brightest star in the southern constellation of Lupus. According to the Bortle Dark-Sky Scale, its apparent visual magnitude of 2.3[2] makes it readily visible to the naked eye even from highly light-polluted locales. Based upon parallax measurements made during the Hipparcos mission,[11] the star is around 460 light-years (140 parsecs) from the solar system.[1] It is one of the nearest supernova candidates.[12]

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  12. ^ Cite error: The named reference Firestone2014 was invoked but never defined (see the help page).


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