Epsilon Tucanae

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Template:Short description

Epsilon Tucanae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Tucana
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.50[2]
Characteristics
Spectral type B8 V[3] or B9 IV[4]
U−B Template:Engvar −0.28[2]
B−V Template:Engvar −0.08[2]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[5] km/s
Proper motion (μ) RA: +47.93[1] mas/yr
Dec.: −22.95[1] mas/yr
Parallax (π)8.74±0.18 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.80[6]
Details
MassScript error: No such module "val".[3] Template:Solar mass
Luminosity389[3] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[3] cgs
TemperatureScript error: No such module "val".[3] K
Rotation0.79318(8)[7] d
Rotational velocity (v sin i)Script error: No such module "val".[3] km/s
Age123[3] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
ε Tuc, CPD−66°3819, FK5 903, HD 224686, HIP 118322, HR 9076, SAO 255619[8]
Database references
SIMBADdata

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Epsilon Tucanae (ε Tuc, ε Tucanae) is a solitary[9] star in the southern constellation of Tucana. With an apparent visual magnitude of +4.50,[2] it is faintly visible to the naked eye. Based upon an annual parallax shift of 8.74 mas as seen from Earth, it is located around 373 light years from the Sun.

Levenhagen and Leister (2008) classified this star as B8 V,[3] indicating a blue-white hued B-type main sequence star. However, Hiltner, Garrison, and Schild (1969) listed it with a classification of B9 IV,[4] suggesting it may be a more evolved subgiant star. It is a rapidly rotating Be star that is an estimated 78% of the way through its main sequence lifetime.[10] The projected rotational velocity is 300 km/s,[3] which is giving it an oblate shape with an equatorial bulge that is an estimated 36% larger than the polar radius.[11] It has a weak magnetic field with a strength of Script error: No such module "val"..[12]

It is the last star in the Hipparcos catalogue, HIP 118322, from the Hipparcos (1989–1993) astrometry satellite.

References

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  8. ↑ Script error: No such module "citation/CS1".
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  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Tucana

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