13 Trianguli

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13 Trianguli
Observation data
Epoch J2000      Equinox J2000
Constellation Triangulum
Right ascension 02h 28m 48.49387s[1]
Declination +29° 55′ 54.3315″[1]
Apparent magnitude (V) 5.86[2]
Spectral type G0 V[1]
U−B color index +0.01[2]
B−V color index +0.58[2]
Radial velocity (Rv)+40.8[3] km/s
Proper motion (μ) RA: –66.53[1] mas/yr
Dec.: +71.93[1] mas/yr
Parallax (π)31.84 ± 0.40[1] mas
Distance102 ± 1 ly
(31.4 ± 0.4 pc)
Absolute magnitude (MV)3.45[4]
Mass1.10 ± 0.03[4] M
Luminosity3.72[4] L
Temperature5,846[4] K
Metallicity [Fe/H]–0.24[5] dex
Rotational velocity (v sin i)3[6] km/s
Age6.45[4] Gyr
Other designations
13 Tri, BD+29 423, GJ 99.1, HD 15335, HIP 11548, HR 720, SAO 75391.[2]
Database references

13 Trianguli is the Flamsteed designation for a star in the northern constellation of Triangulum. It has an apparent visual magnitude of 5.86,[2] so according to the Bortle scale it is faintly visible from dark suburban skies. Measurements made with the Hipparcos spacecraft show an annual parallax shift of 0.03184″,[1] which is equivalent to a distance of around 102 ly (31 pc) from the Sun.

A stellar classification of G0 V[1] indicates this is a main sequence star that is generating energy by fusing hydrogen into helium at its core. It has about 110% of the Sun's mass and shines with 3.72 times the luminosity of the Sun. The stellar atmosphere has an effective temperature of 5,846[4] K, giving it the yellow hue of a G-type star.[7] It appears to be older than the Sun, with an estimated age of 6.45 billion years.[4]

In 1994, an astrometric companion was reported at an angular separation of 0.020″. However, follow-up observations reported in 2005 not only failed to recover this object but also returned a null result on a search for planetary companions.[8] The star has been examined for an infrared excess that could indicate the presence of an orbiting debris disk, but no such excess was found.[5]


  1. ^ a b c d e f g h van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d e "13 Tri -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2013-10-13. 
  3. ^ Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14,000 F and G dwarfs", Astronomy and Astrophysics, 418: 989–1019, arXiv:astro-ph/0405198Freely accessible, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959. 
  4. ^ a b c d e f g Takeda, Yoichi (April 2007), "Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database", Publications of the Astronomical Society of Japan, 59 (2): 335–356, Bibcode:2007PASJ...59..335T, doi:10.1093/pasj/59.2.335. 
  5. ^ a b Maldonado, J.; et al. (May 2012). "Metallicity of solar-type stars with debris discs and planets". Astronomy & Astrophysics. 541: A40. arXiv:1202.5884Freely accessible. Bibcode:2012A&A...541A..40M. doi:10.1051/0004-6361/201218800. 
  6. ^ Takeda, Yoichi; et al. (February 2005), "High-Dispersion Spectra Collection of Nearby F--K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards", Publications of the Astronomical Society of Japan, 57 (1): 13–25, Bibcode:2005PASJ...57...13T, doi:10.1093/pasj/57.1.13. 
  7. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-01-16. 
  8. ^ van Belle, G. T.; et al. (May 2008). "The Palomar Testbed Interferometer Calibrator Catalog". The Astrophysical Journal Supplement Series. 176 (1): 276–292. arXiv:0711.4194Freely accessible. Bibcode:2008ApJS..176..276V. doi:10.1086/526548. 

Coordinates: Sky map 02h 28m 48.49s, +29° 55′ 54.33″