Beta Leporis (β Leporis, abbreviated Beta Lep, β Lep), formally named Nihal /ˈnaɪ.æl/,[10][11] is the second brightest star in the constellation of Lepus.[12]
Beta Leporis is the star's Bayer designation. It is also known by the traditional named Nihal, Arabic for "quenching their thirst". The occasional spelling Nibal appears to be due to a misreading.[13] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[14] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[15] included a table of the first two batches of names approved by the WGSN; which included Nihal for this star.
In Chinese, 廁 (Cè), meaning Toilet, refers to an asterism consisting of β Leporis, α Leporis, γ Leporis and δ Leporis.[16] Consequently, the Chinese name for β Leporis itself is 廁二 (Cè èr), "the Second Star of Toilet".[17]
Based on parallax measurements from the Hipparcos astrometry satellite,[18] this star is located about 160 light-years (49 parsecs) from the Earth. It has an apparent visual magnitude of 2.81[2] and a stellar classification of G5 II.[3] The mass of this star is 3 times the mass of the Sun and it is about 390 million years old,[2] which is the sufficient time for a star this massive to consume the hydrogen at its core and evolve away from the main sequence, becoming a G-type bright giant.[3] Currently, it has expanded to 12.6 times the Sun's size[2] and is emitting 171 times its luminosity.[8]
This is a double star system and may be a binary, whereby the second star has a brightness of 7.34 mag.[19] Using adaptive optics on the AEOS telescope at Haleakala Observatory, the pair was found to be separated by an angle of 2.58 arcseconds at a position angle of 1.4°.[20] Component B has been observed to fluctuate in brightness and is catalogued as suspected variable star NSV 2008.[21]
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