Eta Tucanae

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η Tucanae
Tucana constellation map.svg
Red circle.svg

Location of η Tucanae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Tucana
Right ascension 23h 57m 35.07819s[1]
Declination −64° 17′ 53.6293″[1]
Apparent magnitude (V) +5.00[2]
Spectral type A1V[2]
U−B color index +0.08[3]
B−V color index +0.06[3]
Radial velocity (Rv) +32.50[4] km/s
Proper motion (μ) RA: +79.12[1] mas/yr
Dec.: -60.80[1] mas/yr
Parallax (π) 21.08 ± 0.49[1] mas
Distance 155 ± 4 ly
(47 ± 1 pc)
Absolute magnitude (MV) 1.62[5]
Mass 2.2[6] M
Radius 1.8[7] R
Luminosity 23[8] L
Surface gravity (log g) 4.31[9] cgs
Temperature 9,057[8] K
Rotational velocity (v sin i) 187[8] km/s
Other designations
HR 9062, HD 224392, CPD–64° 4391, HIP 118121, SAO 255609, GC 33223, GSC 09130-01766
Database references

Eta Tucanae (η Tuc, η Tucanae) is a star in the constellation Tucana.

Eta Tucanae is a white A-type main sequence dwarf with an apparent magnitude of +5.00. It is approximately 155 light years from Earth.[1] This is a Vega-like star that has an infrared excess. It is about 10–40 million years old and is a member of the Tucana association.[2]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c Ehrenreich, D.; et al. (November 2010), "Deep infrared imaging of close companions to austral A- and F-type stars", Astronomy and Astrophysics, 523: A73, Bibcode:2010A&A...523A..73E, arXiv:1007.0002Freely accessible, doi:10.1051/0004-6361/201014763 
  3. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M. Vizier catalog entry
  4. ^ Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. Bibcode:2007AN....328..889K. arXiv:0705.0878Freely accessible. doi:10.1002/asna.200710776. 
  5. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971Freely accessible. doi:10.1134/S1063773712050015.  Vizier catalog entry
  6. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. Bibcode:2011MNRAS.410..190T. arXiv:1007.4883Freely accessible. doi:10.1111/j.1365-2966.2010.17434.x.  Vizier catalog entry
  7. ^ Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002Freely accessible.  Vizier catalog entry
  8. ^ a b c Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. Bibcode:2012A&A...537A.120Z. arXiv:1201.2052Freely accessible. doi:10.1051/0004-6361/201117691.  Vizier catalog entry
  9. ^ David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. Bibcode:2015ApJ...804..146D. arXiv:1501.03154Freely accessible. doi:10.1088/0004-637X/804/2/146.  Vizier catalog entry