13 Trianguli

13 Trianguli is the Flamsteed designation for a star in the northern constellation of Triangulum. It has an apparent visual magnitude of 5.89,^[2] so according to the Bortle scale it is faintly visible from dark suburban skies. The star is located at a distance of 103 light years from the Sun based on parallax measurements,^[1] and is drifting further away with a radial velocity of +41 km/s.^[4] It made a close approach to the Sun some 665,000 years ago at an estimated separation of 34.3 light-years.^[2]

13 Trianguli

Location of 13 Trianguli (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Triangulum
Right ascension	02h 28m 48.49449s[1]
Declination	+29° 55′ 54.3286″[1]
Apparent magnitude (V)	5.89[2]
Characteristics
Spectral type	G0 V[2]
U−B color index	+0.01[3]
B−V color index	+0.591±0.014[2]
Astrometry
Radial velocity (Rv)	+40.8[4] km/s
Proper motion (μ)	RA: –66.071[1] mas/yr Dec.: +71.499[1] mas/yr
Parallax (π)	31.7031 ± 0.1014 mas[1]
Distance	102.9 ± 0.3 ly (31.5 ± 0.1 pc)
Absolute magnitude (MV)	3.45[5]
Details
Mass	1.10±0.03[5] M☉
Radius	1.86±0.03[1] R☉
Luminosity	3.72[5] L☉
Temperature	5,846[5] K
Metallicity [Fe/H]	−0.24[6] dex
Rotational velocity (v sin i)	3[7] km/s
Age	6.45[5] Gyr
Other designations
13 Tri, BD+29 423, GJ 99.1, HD 15335, HIP 11548, HR 720, SAO 75391[3]
Database references
SIMBAD	data

A stellar classification of G0 V^[2] 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, 186% of the Sun's radius, and shines with 3.72 times the luminosity of the Sun. The stellar atmosphere has an effective temperature of 5,846 K,^[5] giving it the yellow hue of a G-type star.^[8] It appears to be older than the Sun, with an estimated age of 6.45 billion years.^[5]

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.^[9] 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.^[6]

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
3. "13 Tri -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2013-10-13.
4. 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 (3): 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959, S2CID 11027621.
5. 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.
6. Maldonado, J.; et al. (May 2012). "Metallicity of solar-type stars with debris discs and planets". Astronomy & Astrophysics. 541: A40. arXiv:1202.5884. Bibcode:2012A&A...541A..40M. doi:10.1051/0004-6361/201218800. S2CID 46328823.
7. 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.
8. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.
9. van Belle, G. T.; et al. (May 2008). "The Palomar Testbed Interferometer Calibrator Catalog". The Astrophysical Journal Supplement Series. 176 (1): 276–292. arXiv:0711.4194. Bibcode:2008ApJS..176..276V. doi:10.1086/526548. S2CID 10713221.