Astronomy:1 Trianguli

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Short description: Star in the constellation Triangulum
1 Trianguli
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Triangulum
Right ascension  01h 42m 05.92475s[1]
Declination +29° 30′ 21.8431″[1]
Apparent magnitude (V) 7.52±0.01[2]
Characteristics
Evolutionary stage main sequence star[1]
Spectral type A2 V[3]
B−V color index +0.06[2]
Astrometry
Radial velocity (Rv)7±4.5[4] km/s
Proper motion (μ) RA: −10.545[1] mas/yr
Dec.: −0.288[1] mas/yr
Parallax (π)4.5114 ± 0.0515[1] mas
Distance723 ± 8 ly
(222 ± 3 pc)
Absolute magnitude (MV)+0.78[5]
Details
Mass2.36+0.34−0.30[6] M☉
Radius2.69±0.14[7] R☉
Luminosity52+1.5−2.2[1] L☉
Surface gravity (log g)3.90[8] cgs
Temperature9,305+145−192[6] K
Metallicity [Fe/H]−0.02[8] dex
Age371±23[9][10] Myr
Other designations
1 Trianguli, BD+28°282, GC 2068, HD 10407, HIP 7948, SAO 74880, GSC 01762-00704[11]
Database references
SIMBADdata

1 Trianguli, also known as HD 10407, is a star located in the northern constellation Triangulum. It has an apparent magnitude of 7.52,[2] making it readily visible in binoculars but not to the naked eye. Gaia DR3 parallax measurements imply a distance of 723 light years[1] and it is currently receding with a heliocentric radial velocity of 7 km/s.[4] At its current distance 1 Trianguli's brightness is diminished by a quarter of a magnitudes due to interstellar dust[12] and it has an absolute magnitude of +0.78.[5] Even though it has a Flamsteed designation, 1 Trianguli is one of the 220 Flamsteed stars that are not in the Yale Bright Star Catalogue.[13]

1 Trianguli has a stellar classification of A2 V,[3] indicating that it is an ordinary A-type main-sequence star. It has 2.36 times the mass of the Sun[6] and 2.69 times the Sun's radius.[7] It radiates 52 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 9,305 K,[6] giving it a white hue. It has a near solar metallicity at [Fe/H] = −0.02[8] and 1 Trianguli is estimated to be 371 million years old.[9][10]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 Hog, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000-03-01). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Clausen, J. V.; Jensen, K. S. (1979). "Classification Based on 102/A/Mm Objective Prism Spectra". IAU Colloq. 47: Spectral Classification of the Future 9: 479. Bibcode: 1979RA......9..479C. 
  4. ↑ 4.0 4.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  5. ↑ 5.0 5.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 6.2 6.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  7. ↑ 7.0 7.1 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics 426 (1): 297–307. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  8. ↑ 8.0 8.1 8.2 Anders, F. et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics 658: A91. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A. 
  9. ↑ 9.0 9.1 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 1063-7737. Bibcode: 2012AstL...38..771G. 
  10. ↑ 10.0 10.1 Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters 38 (11): 694–706. doi:10.1134/S1063773712110035. ISSN 1063-7737. Bibcode: 2012AstL...38..694G. 
  11. ↑ "*1 Tri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A1+Tri. 
  12. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  13. ↑ Bidelman, W. P. (December 1990). "Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"" (in en). Bulletin d'Information du Centre de Donnees Stellaires 38. ISSN 1169-8837. Bibcode: 1990BICDS..38...13B. 



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