Zeta2 Librae
Alpha2 Canum Venaticorum variable in Libra
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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]
 | |
| 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
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.