5 Trianguli

5 Trianguli is a solitary star located in the northern constellation Triangulum. With an apparent magnitude of 6.23,[2] it’s barely visible to the naked eye under ideal conditions. The star is located 399 light years[1] away from the Solar System, but is drifting away with a radial velocity of 7.7 km/s.[5]

5 Trianguli
Location of 5 Trianguli (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Triangulum
Right ascension 02h 11m 25.02s[1]
Declination +31° 31′ 35.02″[1]
Apparent magnitude (V) 6.23±0.01[2]
Characteristics
Spectral type A0 Vm[3]
U−B color index +0.11[4]
B−V color index +0.12[4]
Astrometry
Radial velocity (Rv)7.7±1.5[5] km/s
Proper motion (μ) RA: +35.429[1] mas/yr
Dec.: −10.785[1] mas/yr
Parallax (π)8.1779 ± 0.0862 mas[1]
Distance399 ± 4 ly
(122 ± 1 pc)
Absolute magnitude (MV)+1.07[6]
Details[7]
Mass2.22±0.41 M☉
Radius2.96±0.36 R☉
Luminosity48.2±1.2 L☉
Surface gravity (log g)3.84±0.31 cgs
Temperature8,836 K
Metallicity [Fe/H]−0.17[8] dex
Rotational velocity (v sin i)15±10[9] km/s
Other designations
5 Trianguli, BD+30 347, HD 13372, HIP 10220, HR 634, SAO 55338
Database references
SIMBADdata

5 Trianguli has a classification of A0 Vm,[3] which states it’s an A-type main-sequence star with unusually strong metallic lines. It has 2.22 times the mass of the Sun and 2.96 times the radius of the Sun. 5 Trianguli radiates at 48 solar luminosities from its photosphere at an effective temperature of 8,836 kelvin, which gives it a white-hue of an A-type star.[7] It has a low projected rotational velocity of 15 km/s, common for Am stars.[9]

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. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "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. Palmer, D. R.; Walker, E. N.; Jones, D. H. P.; Wallis, R. E. (1968). "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars". Royal Greenwich Observatory Bulletins. 135: 385. Bibcode:1968RGOB..135..385P.
  4. Sato, K.; Kuji, S. (November 1990). "MK classification and photometry of stars used for time and latitude observations at Mizusawa and Washington". Astronomy and Astrophysics Supplement Series. 85: 1069. Bibcode:1990A&AS...85.1069S. ISSN 0365-0138.
  5. 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. ISSN 1063-7737. S2CID 119231169.
  6. 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. ISSN 1063-7737. S2CID 255204555.
  7. Stassun, Keivan G.; et al. (September 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. ISSN 0004-6256.
  8. Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
  9. Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. ISSN 0067-0049.
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