Zeta2 Librae

For other star systems with a similar Bayer designation, see Zeta Librae.

ζ² Librae (abbreviated Zeta² Librae, Zeta² Lib, ζ² Lib), also known as 33 Librae, is a variable star in the constellation Libra. It is approximately 260 light-years away from the Sun.^[1]

Zeta² Librae

Location of ζ2 Librae (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Libra
Right ascension	15h 29m 34.7424s[1]
Declination	−17° 26′ 27.378″[1]
Apparent magnitude (V)	6.66 - 6.71[2]
Characteristics
Evolutionary stage	main sequence star
Spectral type	F0VspEuGdSr[3]
Variable type	roAp[2]
Astrometry
Proper motion (μ)	RA: −68.387 mas/yr[1] Dec.: +7.364 mas/yr[1]
Parallax (π)	12.6122±0.0334 mas[1]
Distance	258.6 ± 0.7 ly (79.3 ± 0.2 pc)
Details
Mass	1.7[1] M☉
Radius	1.8[1] R☉
Luminosity	9.7[1] L☉
Surface gravity (log g)	4.15[1] cgs
Temperature	7,543[1] K
Metallicity [Fe/H]	0.39[1] dex
Age	977[1] Myr
Other designations
33 Librae, GZ Librae, HD 137949, HIP 75848, 2MASS J15293475-1726274, BD-16 4093, GSC 06188-01530, SAO 159292, TYC 6188-1520-1, WDS J15296-1726A
Database references
SIMBAD	data

Zeta² Librae does not have an HR number, although it is included in the Bright Star Catalogue Supplement.^[4][5]

Characteristics

A light curve for Zeta² Librae, adapted from Wraight et al. (2012)^[6]

33 Librae is an F-type main sequence star, and show abundance of europium, gadolinium and strontium in the spectrum.^[3] It is a rapidly oscillating Ap star.^[2] It bears the variable star designation GZ Librae.

See also

• List of stars in Libra