Pi Tucanae

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Template:Short description

Pi Tucanae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Tucana
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +5.49[2]
Characteristics
Spectral type B9 V[3]
U−B Template:Engvar −0.11[2]
B−V Template:Engvar −0.05[2]
Astrometry
Radial velocity (Rv)Template:Val[4] km/s
Proper motion (μ) RA: −3.53[1] mas/yr
Dec.: −0.10[1] mas/yr
Parallax (π)10.25±0.21 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.57[5]
Details
π Tuc A
MassTemplate:Val[6] Template:Solar mass
Luminosity59[7] Template:Solar luminosity
Surface gravity (log g)Template:Val[6] cgs
TemperatureTemplate:Val[6] K
Rotational velocity (v sin i)236[8] km/s
AgeTemplate:Val[6] Myr
π Tuc B
Mass0.60[5] Template:Solar mass
RadiusTemplate:Solar radius calculator[5]Template:Efn Template:Solar radius
Luminosity0.063[5] Template:Solar luminosity
Temperature3,890[5] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
π Tuc, CPD−70°12, FK5 2018, HD 1685, HIP 1647, HR 83, SAO 248167[9]
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

Pi Tucanae (π Tuc, π Tucanae) is a double star[5] in the southern constellation of Tucana. It is visible to the naked eye with a combined apparent visual magnitude of +5.49.[2] Based upon an annual parallax shift of 10.25 mas as seen from Earth, it is located around 317 light years from the Sun.

The brighter star, component A, is a B-type main sequence star with a stellar classification of B9 V.[3] At an age of about 206 million years,[6] it is spinning rapidly with a projected rotational velocity of 236.[8] The star has an estimated 2.8[6] times the mass of the Sun and radiates 59[7] times the solar luminosity from its photosphere at an effective temperature of 11,393 K.[6]

There is a nearby visual companion, component B, but the two stars may not form a physical pair. This star has a K-band magnitude of 10.1 and is a source of X-ray emission. It has 60% of the Sun's mass and just 6.3% of the Sun's luminosity, with an effective temperature of 3,890 K.[5] The pair have an angular separation of 2.28 arc seconds along a position angle of 211.4°, which corresponds to a projected separation of 214.1 AU.[5]

Notes

Template:Notelist

References

Template:Reflist

Template:Stars of Tucana

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Cousins1971
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named houk1979
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named deBruijne2012
  5. ↑ a b c d e f g h Cite error: Invalid <ref> tag; no text was provided for refs named Hubrig2001
  6. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Kraus2016
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Mcdonald2012
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Royer2007
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
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