Zeta Tucanae

Zeta Tucanae
Location of ζ Tucanae (near center).
Observation data
Epoch J2000      Equinox J2000
Constellation Tucana
Right ascension 00h 20m 04.25995s[1]
Declination −64° 52′ 29.2549″[1]
Apparent magnitude (V) 4.23
Characteristics
Spectral type F9.5 V[2]
U−B color index 0.02[3]
B−V color index 0.58[3]
Variable type None[4]
Astrometry
Radial velocity (Rv)8.8 ± 0.02[5] km/s
Proper motion (μ) RA: 1,707.42[1] mas/yr
Dec.: 1,164.30[1] mas/yr
Parallax (π)116.46 ± 0.16 mas[1]
Distance28.01 ± 0.04 ly
(8.59 ± 0.01 pc)
Absolute magnitude (MV)4.67[6]
Details
Mass0.99±0.02[7] M☉
Radius1.08±0.08[8] R☉
Luminosity1.26[8] L☉
Surface gravity (log g)4.48[9] cgs
Temperature5,970[9] K
Metallicity [Fe/H]−0.18[9] dex
Rotation31.1±0.1 d[10]
Rotational velocity (v sin i)3.0[11] km/s
Age2.1–3.02[12][13] Gyr
Other designations
ζ Tuc, FK5 10, GC 401, GJ 17, HD 1581, HIP 1599, HR 77, SAO 248163, LHS 5, LTT 167[14]
Database references
SIMBADdata

Zeta Tucanae, Latinized from ζ Tucanae, is a star in the constellation Tucana. It is a spectral class F9.5 main sequence star with an apparent magnitude of +4.23. Despite having a slightly lower mass, this star is more luminous than the Sun.[7] Based upon parallax measurements by the Hipparcos spacecraft, it is approximately 28.0 light years from Earth.[1] This is one of the least variable stars observed during the Hipparcos mission.[4][15]

The composition and mass of this star are very similar to the Sun, with a slightly lower mass and an estimated age of three billion years. The solar-like qualities make it a target of interest for investigating the possible existence of a life-bearing planet.[15]

Based upon an excess emission of infrared radiation at 70 micrometres, this system is believed to have a debris disk. The disk is orbiting the star at a minimum radius of 2.3 astronomical units. It is radiating with a maximum temperature of 218 K.[12] As of 2009, no planet has been discovered in orbit around this star.[16]

The components of this star's space velocity are U = −60, V = −4 and W = −38 km/s. These correspond to the velocity toward the Galactic Center, the velocity along the direction of galactic rotation, and the velocity toward the north galactic pole, respectively.[17] It is orbiting through the galaxy at a mean distance of 8.4 kpc from the Galactic Center and with an orbital eccentricity of 0.16.[15]

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