Zeta Hydrae

ζ Hydrae
Location of ζ Hydrae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hydra
Right ascension 08h 55m 23.62614s[1]
Declination +05° 56′ 44.0354″[1]
Apparent magnitude (V) 3.10[2]
Characteristics
Spectral type G9 II-III[3]
U−B color index +0.82[2]
B−V color index +1.00[2]
Astrometry
Radial velocity (Rv)+22.8[4] km/s
Proper motion (μ) RA: –100.06[1] mas/yr
Dec.: +15.46[1] mas/yr
Parallax (π)19.51 ± 0.18 mas[1]
Distance167 ± 2 ly
(51.3 ± 0.5 pc)
Absolute magnitude (MV)–0.24[5]
Details[6]
Mass3.09±0.1 M☉
Radius17.61±0.19 R☉
Luminosity174.2±9.3 L☉
Surface gravity (log g)2.48[7] cgs
Temperature4,996±30 K
Metallicity [Fe/H]–0.21[8] dex
Rotational velocity (v sin i)2.5[8] km/s
Age370±40 Myr
Other designations
16 Hydrae, BD+06 2060, FK5 334, HD 76294, HIP 43813, HR 3547, SAO 117264.[9]
Database references
SIMBADdata

Zeta Hydrae (ζ Hya, ζ Hydrae) is a solitary star in the equatorial constellation of Hydra. This is a generally faint constellation, so, at an apparent visual magnitude of +3.10,[2] this is the third-brightest member after Alphard and Gamma Hydrae.

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