1 Trianguli

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
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
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 mas/yr[1]
Dec.: −0.288 mas/yr[1]
Parallax (π)4.5114 ± 0.0515 mas[1]
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, AG+29°220, BD+28°282, GC 2068, HD 10407, HIP 7948, SAO 74880, GSC 01762-00704[11]
Database references
SIMBADdata

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. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. Hog, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000-03-01). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. 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. 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. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  5. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  6. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
  7. 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. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
  8. 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. arXiv:2111.01860. Bibcode:2022A&A...658A..91A. doi:10.1051/0004-6361/202142369. eISSN 1432-0746. ISSN 0004-6361.
  9. Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. eISSN 1562-6873. ISSN 1063-7737. S2CID 118345778.
  10. Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters. 38 (11): 694–706. arXiv:1606.09028. Bibcode:2012AstL...38..694G. doi:10.1134/S1063773712110035. eISSN 1562-6873. ISSN 1063-7737. S2CID 255202762.
  11. "*1 Tri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved March 29, 2021.
  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. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
  13. P., Bidelman, W. (December 1990). "Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"". Bulletin d'Information du Centre de Donnees Stellaires. 38. Bibcode:1990BICDS..38...13B. ISSN 1169-8837.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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