Arneb

α Leporis

Location of α Leporis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Lepus
Right ascension	05h 32m 43.81612s
Declination	−17° 49′ 20.2414″
Apparent magnitude (V)	2.589
Characteristics
Spectral type	F0 Ib
U−B color index	+0.386
B−V color index	+0.217
Astrometry
Radial velocity (Rv)	+23.9 km/s
Proper motion (μ)	RA: +3.56 mas/yr Dec.: +1.18 mas/yr
Parallax (π)	1.47 ± 0.14mas
Distance	2,200 ± 200 ly (680 ± 60 pc)
Absolute magnitude (MV)	−6.574
Details
Mass	13.9 ± 0.8 M☉
Radius	129 R☉
Luminosity	32,000 L☉
Surface gravity (log g)	1.34 ± 0.07 cgs
Temperature	6,850 ± 80 K
Metallicity [Fe/H]	+0.04 dex
Rotational velocity (v sin i)	21 km/s
Age	13 Myr
Other designations
Arneb, 11 Leporis, BD−17°1166, FK5 207, HD 36673, HIP 25985, HR 1865, SAO 150547
Database references
SIMBAD	data

Alpha Leporis (α Leporis, abbreviated Alpha Lep, α Lep), also named Arneb, is the brightest star in the constellation of Lepus.

Alpha Leporis is the star's Bayer designation. The traditional name Arneb comes from the Arabic أرنب ’arnab 'hare' ('Lepus' is Latin for hare). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN; which included Arneb for this star.

This is a massive star with about 14 times the mass of the Sun. The interferometer-measured angular diameter of this star, after correction for limb darkening, is 1.77 ± 0.09 mas. At an estimated distance of 2,218 light-years (680 parsecs), this yields a physical size of about 129 times the radius of the Sun. Alpha Leporis has a stellar classification of F0 Ib, with the Ib luminosity class indicating that it is a lower luminosity supergiant star. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. The effective temperature of the outer envelope is about 6,850 K, which gives the star a yellow-white hue that is typical of F-type stars. It is an estimated 13 million years old.