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Beta Leonis

Denebola
Leo constellation map.svg
Red circle.svg

Location of β Leonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 49m 03.57834s
Declination +14° 34′ 19.4090″
Apparent magnitude (V) 2.113
Characteristics
Spectral type A3Vvar
U−B color index +0.153
B−V color index +0.107
Variable type suspected δ Sct
Astrometry
Radial velocity (Rv) –0.2 km/s
Proper motion (μ) RA: –497.68 mas/yr
Dec.: –114.67 mas/yr
Parallax (π) 90.91 ± 0.52mas
Distance 35.9 ± 0.2 ly
(11.00 ± 0.06 pc)
Details
Mass 1.78 M
Radius 1.728 R
Luminosity 15 L
Surface gravity (log g) 4.0 cgs
Temperature 8,500 K
Metallicity [Fe/H] +0.00 dex
Rotational velocity (v sin i) 128 km/s
Age 100–380 Myr
Other designations
Deneb Aleet, β Leonis, 94 Leo, BD+15°2383, FK5 444, GCTP 2738.00, GJ 448, HD 102647, HIP 57632, HR 4534, LHS 2462, LTT 13249, SAO 99809.
Database references
SIMBAD data

Denebola, also designated Beta Leonis (β Leonis, abbreviated Beta Leo, β Leo) is the third-brightest star in the zodiac constellation of Leo. It is an A-type main sequence star with 75% more mass than the Sun and fifteen times the Sun's luminosity. Based on parallax measurements from the Hipparcos astrometry satellite, the star is at a distance of about 36 light-years (11 parsecs) from the Sun. Its apparent visual magnitude is 2.14, making it readily visible to the naked eye. Denebola is a suspected Delta Scuti type variable star, meaning its luminosity varies very slightly over a period of a few hours.

β Leonis (Latinised to Beta Leonis) is the star's Bayer designation. In Johann Bayer's Uranometria (1603), it was designated β (Beta) as the second-brightest star in the constellation. It also bears the Flamsteed designation of 94 Leonis (assigned on the basis of increasing right ascension rather than luminosity) and additional designations followed as the star was recorded in subsequent star catalogues.

The traditional name Denebola is shortened from Deneb Alased, from the Arabic phrase ذنب الاسد ðanab al-asad 'tail of the lion', as it represents the lion's tail, the star's position in the Leo constellation. (Deneb in Cygnus has a similar name origin.) In the Alphonsine Tables it was recorded as Denebalezeth. On R. A. Proctor's 1871 star chart of the Northern Hemisphere it was designated Deneb Aleet. 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 Denebola for this star. It is now so entered in the IAU Catalog of Star Names.


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Wikipedia

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