Beta Librae information

Beta Librae
	The position of β Librae (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Libra
Right ascension	15h 17m 00.41382s
Declination	−09° 22′ 58.4919″
Apparent magnitude (V)	2.61
Characteristics
Spectral type	B8 V
U−B color index	−0.359
B−V color index	−0.106
Variable type	Suspected
Astrometry
Radial velocity (Rv)	−35.2 km/s
Proper motion (μ)	RA: −98.10 mas/yr ; Dec.: −19.65 mas/yr
Parallax (π)	17.62 ± 0.16 mas
Distance	185 ± 2 ly ; (56.8 ± 0.5 pc)
Absolute magnitude (MV)	−1.16
Details
Mass	3.5+0.3; −0.2 M☉
Radius	4.9 R☉
Luminosity	130 L☉
Temperature	12300 K
Metallicity [Fe/H]	0.33 dex
Rotational velocity (v sin i)	250 km/s
Age	80+50; −40 Myr
Other designations
	Zubeneschamali, Kiffa Australis, Lanx Borealis, β Lib, 27 Librae, BD-08° 3935, FK5 564, HD 135742, HIP 74785, HR 5685, NSV 7009, SAO 140430
Database references
SIMBAD	data

Beta Librae (β Librae, abbreviated Beta Lib, β Lib), formally named Zubeneschamali /zuːˌbɛnɛʃəˈmeɪli/,^[10]^[11] is (despite its 'beta' designation) the brightest star in the zodiac constellation of Libra. From parallax measurements, its distance can be estimated as 185 light-years (57 parsecs) from the Sun.^[1]

The apparent visual magnitude of this star is 2.6.^[2] According to Eratosthenes, Beta Librae was observed to be brighter than Antares. Ptolemy, 350 years later, said it was as bright as Antares. The discrepancy may be due to Antares becoming brighter, but this is not known for certain. It could simply be caused by Beta Librae being a variable star, showing a present-day variability of 0.03 of a magnitude.^[12]

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^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
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[aaa474_2_653-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).

[scfs-2] Cite error: The named reference scfs was invoked but never defined (see the help page).

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[Kunitzsch-10] Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.

[IAU-CSN-11] "IAU Catalog of Star Names". Retrieved 28 July 2016.

[Auk-12] Cite error: The named reference Auk was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
The position of β Librae (circled)
Constellation	Libra
Right ascension	15^h 17^m 00.41382^s^[1]
Declination	−09° 22′ 58.4919″^[1]
Apparent magnitude (V)	2.61^[2]
Characteristics
Spectral type	B8 V^[3]
U−B color index	−0.359^[4]
B−V color index	−0.106^[4]
Variable type	Suspected
Astrometry

Radial velocity (R_v)	−35.2^[2] km/s
Proper motion (μ)	RA: −98.10^[1] mas/yr Dec.: −19.65^[1] mas/yr
Parallax (π)	17.62 ± 0.16 mas^[1]
Distance	185 ± 2 ly (56.8 ± 0.5 pc)
Absolute magnitude (M_V)	−1.16^[5]

Details

Mass	3.5+0.3 −0.2^[3] `M`_☉
Radius	4.9^[6] `R`_☉
Luminosity	130 `L`_☉
Temperature	12300^[7] K
Metallicity [Fe/H]	0.33^[3] dex
Rotational velocity (v sin i)	250^[8] km/s
Age	80+50 −40^[3] Myr

Other designations
Zubeneschamali, Kiffa Australis, Lanx Borealis, β Lib, 27 Librae, BD-08° 3935, FK5 564, HD 135742, HIP 74785, HR 5685, NSV 7009, SAO 140430^[9]
Database references
SIMBAD	data

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