Beta Leporis

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Template:Short description

β Leporis
Template:Location mark
Location of β Leporis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lepus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 2.84[2]
Characteristics
Spectral type G5 II[3]
U−B Template:Engvar +0.47[2]
B−V Template:Engvar +0.82[2]
R−I Template:Engvar +0.44[4]
Astrometry
Radial velocity (Rv)−13.6 ± 0.9[5] km/s
Proper motion (μ) RA: −5.02[1] mas/yr
Dec.: −85.92[1] mas/yr
Parallax (π)20.34±0.18 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.65[6]
Details
Mass3.5 ± 0.1[7] Template:Solar mass
RadiusTemplate:Solar radius calculator[8] Template:Solar radius
LuminosityScript error: No such module "val".[9] Template:Solar luminosity
Surface gravity (log g)2.60 ± 0.03[7] cgs
TemperatureScript error: No such module "val".[9] K
Metallicity [Fe/H]Script error: No such module "val".[9] dex
Rotational velocity (v sin i)11[10] km/s
Age240[7] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Nihal, β Lep, Beta Leporis, Beta Lep, 9 Leporis, 9 Lep, BD−20 1096, FK5 204, GC 6762, HD 36079, HIP 25606, HR 1829, PPM 248938, SAO 170457, WDS 05282-2046A.[3]
Database references
SIMBADdata

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Beta Leporis (β Leporis, abbreviated Beta Lep, β Lep), formally named Nihal Template:IPAc-en,[11][12] is the second brightest star in the constellation of Lepus.[13]

Nomenclature

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.[14] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[16] included a table of the first two batches of names approved by the WGSN; which included Nihal for this star.

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Toilet, refers to an asterism consisting of β Leporis, α Leporis, γ Leporis and δ Leporis.[17] Consequently, the Chinese name for β Leporis itself is Script error: No such module "Lang". (Script error: No such module "Lang".), "the Second Star of Toilet".[18]

Properties

Based on parallax measurements from the Hipparcos astrometry satellite,[19] this star is located about Script error: No such module "convert". from the Earth. It has an apparent visual magnitude of 2.84 and a stellar classification of G5 II. The mass of this star is 3.5 times the mass of the Sun and it is about 240 million years old,[7] 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] The angular diameter of Beta Leporis, after correction for limb darkening, is Script error: No such module "val"..[20] At the distance to this star, it yield a physical radius of 15.9 times the radius of the Sun.[8]

This is a double star system and may be a binary, whereby the second star has a brightness of 7.34 mag.[21] 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°.[22] Component B has been observed to fluctuate in brightness and is catalogued as suspected variable star NSV 2008.[23]

References

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  1. ↑ a b c d e Script error: No such module "Citation/CS1".
  2. ↑ a b c Script error: No such module "Citation/CS1".
  3. ↑ a b c Script error: No such module "citation/CS1".
  4. ↑ HR 1829, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 18, 2008.
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ a b c d Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".. The radius (R*) is given by:
    2⋅R*=(10−3⋅49.2⋅3.003) AU0.0046491 AU/R⨀≈31.78⋅R⨀
  9. ↑ a b c Script error: No such module "Citation/CS1". Beta Leporis' database entry at VizieR.
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  18. ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
  19. ↑ Script error: No such module "citation/CS1".
  20. ↑ Script error: No such module "Citation/CS1".
  21. ↑ Script error: No such module "citation/CS1".
  22. ↑ Script error: No such module "citation/CS1".
  23. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Lepus

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