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HD 171819 (HR 6986) is a solitary[10] star located in the southern constellation Telescopium. It has an apparent magnitude of 5.84,[2] making it faintly visible to the naked eye if viewed under ideal conditions. The star is situated at a distance of 313 light years[1] but is approaching the Solar System with a heliocentric radial velocity of −9 km/s.[6]

HD 171819
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 39m 14.2929s[1]
Declination −47° 54′ 35.1520″[1]
Apparent magnitude (V) 5.84 ± 0.01[2]
Characteristics
Spectral type A7 IV/V[3] or A3 V[4]
B−V color index +0.23[5]
Astrometry
Radial velocity (Rv)−9.0±4.3[6] km/s
Proper motion (μ) RA: +25.426[1] mas/yr
Dec.: +13.951[1] mas/yr
Parallax (π)10.4348 ± 0.1045 mas[1]
Distance313 ± 3 ly
(95.8 ± 1.0 pc)
Absolute magnitude (MV)+0.65[7]
Details
Mass1.84±0.39[8] M☉
Radius3.90±0.54[8] R☉
Luminosity45.6[8] L☉
Surface gravity (log g)3.5±0.3[8] cgs
Temperature7,512[8] K
Metallicity [Fe/H]>0.02[9] dex
Age742[9] Myr
Other designations
22 G. Telescopii, CD−48°12644, CPD−48°9900, GC 25474, HD 171819, HIP 91461, HR 6986, SAO 229165
Database references
SIMBADdata

HD 171819 has a stellar classification of A7 IV/V, indicating that the object is an A-type star with a blended luminosity class of a main sequence star and subgiant.[3] However, W. Buscombe gave it a class of A3 V, making it an ordinary A-type main-sequence star.[4] At present it has 1.84 times the mass of the Sun and 3.9 times the radius of the Sun.[8] It shines at 46 times the luminosity of the Sun from its photosphere at an effective temperature of 7,512 K, giving it a white glow.[8]


References


  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 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. Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H.
  4. Buscombe, W. (1 May 1969). "Line Strengths for Southern OB stars--II: Observations with Moderate Dispersion". Monthly Notices of the Royal Astronomical Society. 144 (1): 31–39. Bibcode:1969MNRAS.144...31B. doi:10.1093/mnras/144.1.31. ISSN 0035-8711.
  5. Stoy, R. H. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 27: 119. Bibcode:1968MNSSA..27..119S. ISSN 0024-8266.
  6. 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.
  7. 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 119257644.
  8. Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; Paegert, Martin; Lee, Nathan De; Torres, Guillermo; Latham, David W.; Charpinet, Stéphane; Dressing, Courtney D.; Huber, Daniel; Kane, Stephen R.; Lépine, Sébastien; Mann, Andrew; Muirhead, Philip S.; Rojas-Ayala, Bárbara; Silvotti, Roberto; Fleming, Scott W.; Levine, Al; Plavchan, Peter (20 August 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.
  9. Gontcharov, G. A. (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. S2CID 118345778.
  10. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976


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