# Zeta2 Librae

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Alpha2 Canum Venaticorum variable in Libra

For other star systems with a similar [Bayer designation](/source/Bayer_designation), see [Zeta Librae](/source/Zeta_Librae).

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[1] 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

**ζ2 Librae** (abbreviated Zeta2 Librae, Zeta2 Lib, ζ2 Lib), also known as **33 Librae**, is a variable [star](/source/Star) in the [constellation](/source/Constellation) [Libra](/source/Libra_(constellation)). It is approximately 260 [light-years](/source/Light-year) away from the [Sun](/source/Sun).[1]

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

## Characteristics

A [light curve](/source/Light_curve) for Zeta2 Librae, adapted from Wraight *et al.* (2012)[6]

33 Librae is an [F-type](/source/F-type_star) [main sequence star](/source/Main_sequence_star), and show abundance of [europium](/source/Europium), [gadolinium](/source/Gadolinium) and [strontium](/source/Strontium) in the spectrum.[3] It is a [rapidly oscillating Ap star](/source/Rapidly_oscillating_Ap_star).[2] It bears the [variable star designation](/source/Variable_star_designation) **GZ Librae**.

## See also

- [List of stars in Libra](/source/List_of_stars_in_Libra)

## References

1. ^ [***a***](#cite_ref-GaiaDR3_1-0) [***b***](#cite_ref-GaiaDR3_1-1) [***c***](#cite_ref-GaiaDR3_1-2) [***d***](#cite_ref-GaiaDR3_1-3) [***e***](#cite_ref-GaiaDR3_1-4) [***f***](#cite_ref-GaiaDR3_1-5) [***g***](#cite_ref-GaiaDR3_1-6) [***h***](#cite_ref-GaiaDR3_1-7) [***i***](#cite_ref-GaiaDR3_1-8) [***j***](#cite_ref-GaiaDR3_1-9) [***k***](#cite_ref-GaiaDR3_1-10) [***l***](#cite_ref-GaiaDR3_1-11) [***m***](#cite_ref-GaiaDR3_1-12) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D6258378305082833408%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-gcvs_2-0) [***b***](#cite_ref-gcvs_2-1) [***c***](#cite_ref-gcvs_2-2) Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". *Astronomy Reports*. **61** (1): 80. [Bibcode](/source/Bibcode_(identifier)):[2017ARep...61...80S](https://ui.adsabs.harvard.edu/abs/2017ARep...61...80S). [doi](/source/Doi_(identifier)):[10.1134/S1063772917010085](https://doi.org/10.1134%2FS1063772917010085).

1. ^ [***a***](#cite_ref-abt1979_3-0) [***b***](#cite_ref-abt1979_3-1) Abt, H. A.; Brodzik, D.; Schaefer, B. (1979). "Spectral types of stars with unusual photometric indices". *Publications of the Astronomical Society of the Pacific*. **91**: 176. [Bibcode](/source/Bibcode_(identifier)):[1979PASP...91..176A](https://ui.adsabs.harvard.edu/abs/1979PASP...91..176A). [doi](/source/Doi_(identifier)):[10.1086/130467](https://doi.org/10.1086%2F130467).

1. **[^](#cite_ref-hr_4-0)** 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](/source/Bibcode_(identifier)):[1995yCat.5050....0H](https://ui.adsabs.harvard.edu/abs/1995yCat.5050....0H).

1. **[^](#cite_ref-supplement_5-0)** 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](/source/Bibcode_(identifier)):[1982bsc..book.....H](https://ui.adsabs.harvard.edu/abs/1982bsc..book.....H).

1. **[^](#cite_ref-Wraight_6-0)** 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"](https://doi.org/10.1111%2Fj.1365-2966.2011.20090.x). *Monthly Notices of the Royal Astronomical Society*. **420** (1): 757–772. [arXiv](/source/ArXiv_(identifier)):[1110.6283](https://arxiv.org/abs/1110.6283). [Bibcode](/source/Bibcode_(identifier)):[2012MNRAS.420..757W](https://ui.adsabs.harvard.edu/abs/2012MNRAS.420..757W). [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2011.20090.x](https://doi.org/10.1111%2Fj.1365-2966.2011.20090.x).

v t e Constellation of Libra List of stars in Libra Libra in Chinese astronomy Stars Bayer α1 α2 (Zubenelgenubi) β (Zubeneschamali) γ (Zubenelhakrabi) δ ε ζ1 ζ2 ζ3 ζ4 η θ ι1 ι2 κ λ μ ν ξ1 ξ2 ο σ (Brachium) τ υ Flamsteed 2 3 4 5 10 11 12 16 17 18 22 23 26 28 30 36 37 41 42 47 48 49 50 Variable HN HO KU KX HR 5504 5455 HD 133131 134439 134440 135485 137010 139139 140283 141569 141937 Other 2M1510 2MASS 1507−1627 CWISEP J1446−2317 HE 1523−0901 WASP-57 WISE 1534−1043 WISE 1541−2250 Exoplanets 23 Librae b c Gliese 581b c e HD 137010 b (unconfirmed) K2-315b WASP-189b Star clusters NGC 5897 Galaxies NGC 5597 5605 5716 5728 5792 5793 5861 5885 5890 5898 5915 5917 Other AP Librae IC 1059 IRAS 14348−1447 PKS 1510−089 PKS 1519−273 QSO B1524−136 RXC J1504.1−0248 BCG Category

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Adapted from the Wikipedia article [Zeta2 Librae](https://en.wikipedia.org/wiki/Zeta2_Librae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Zeta2_Librae?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.