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 261 light-years away from the Sun.^[2]

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)	6.69[1]
Characteristics
Evolutionary stage	main sequence star
Spectral type	Ap
Variable type	α2 CVn
Astrometry
Proper motion (μ)	RA: −68.387[1] mas/yr Dec.: 7.364[1] mas/yr
Parallax (π)	12.6122 ± 0.0334 mas[1]
Distance	258.6 ± 0.7 ly (79.3 ± 0.2 pc)
Details
Mass	1.77 M☉
Radius	1.97 R☉
Luminosity	10.473 L☉
Temperature	7406 K
Age	1.096 Gyr
Other designations
GSC 06188-01530, HD 137949, BD-16 4093, SAO 159292, HIP 75848, 2MASS J15293475-1726274, GC 20814, GCRV 8945, HIC 75848, NSV 7104, PPM 230311, SRS 12967, TD1 18282, TYC 6188-1520-1, UBV 13283, UBV M 20794, uvby98 100137949 V, GZ Lib, WDS J15296-1726A, YZ 107 5681, uvby98 100137949, Gaia DR1 6258378300780159232, WEB 12909, Gaia DR2 6258378305082833408, ζ2 Lib, GEN# +1.00137949, SKY# 28036, Renson 39240, UC 2014A, 33 Lib
Database references
SIMBAD	data

Zeta² Librae does not have an HR number, although it is included in the Bright Star Catalogue Supplement.^[3][4]

Characteristics

A light curve for Zeta² Librae, adapted from Wraight et al. (2012)^[5]

33 Librae is an F-type main sequence star.^[2] It is an α² Canum Venaticorum variable^[2] or a rapidly oscillating Ap star, thus it bears the variable star designation GZ Librae and is almost 14 times brighter than the Sun.^[6]

See also

• List of stars in Libra

References

1. Gaia Collaboration (2020-11-01). "VizieR Online Data Catalog: Gaia EDR3 (Gaia Collaboration, 2020)". VizieR Online Data Catalog: I/350. Bibcode:2020yCat.1350....0G.
2. "Universe Guide–ζ²/33 Librae". Universe Guide. Retrieved 2023-11-19.
3. Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
4. Hoffleit, D.; Jaschek, C. (1982). "The Bright Star Catalogue. Fourth revised edition. (Containing data compiled through 1979)". The Bright Star Catalogue. Fourth Revised Edition. (Containing Data Compiled Through 1979). Bibcode:1982bsc..book.....H.
5. Wraight, K. T.; Fossati, L.; Netopil, M.; Paunzen, E.; Rode-Paunzen, M.; Bewsher, D.; Norton, A. J.; White, Glenn J. (February 2012). "A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars". Monthly Notices of the Royal Astronomical Society. 420 (1): 757–772. arXiv:1110.6283. Bibcode:2012MNRAS.420..757W. doi:10.1111/j.1365-2966.2011.20090.x.
6. Anderson, E.; Francis, C. (2012). "HIP 75848". Extended Hipparcos Compilation (XHIP). VizieR. Retrieved 2021-01-08.