HD 173047
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 45m 55.99514s[1]
Declination −50° 52′ 21.7342″[1]
Apparent magnitude (V) 6.24±0.01[2]
Characteristics
Spectral type B8/9 II[3]
B−V color index −0.080±0.006[4]
Astrometry
Radial velocity (Rv)−10.7±0.4[1] km/s
Proper motion (μ) RA: +3.697 mas/yr[1]
Dec.: −15.975 mas/yr[1]
Parallax (π)3.1031 ± 0.0499 mas[1]
Distance1,050 ± 20 ly
(322 ± 5 pc)
Absolute magnitude (MV)−1.52[4]
Details
Mass4.00±0.11[5] M☉
Radius5.54+0.15
−0.14[1] R☉
Luminosity (bolometric)692[5] L☉
Surface gravity (log g)3.43[6] cgs
Temperature11,843±156[7] K
Metallicity [Fe/H]+0.10[6] dex
Age194[8] Myr
Other designations
28 G. Telescopii[9], CD−50°12122, CPD−50°10815, GC 25645, HD 173047, HIP 92072, SAO 245693[10]
Database references
SIMBADdata

HD 173047 is a solitary, bluish-white hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.24,[2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively far at a distance of 1,050 light-years based on Gaia DR3 parallax measurements, but it is drifting closer with a heliocentric radial velocity of −10.7 km/s.[1] At its current distance, HHD 173047's brightness is heavily diminished by 0.44 magnitudes due to interstellar extinction[8] and it has an absolute magnitude of −1.52[4]

HD 173047 has a stellar classification of B8/9 II,[3] indicating that it is an evolved B-type star with the characteristics of a B8 and B9 bright giant. It has 4 times the mass of the Sun[5] and a slightly enlarged radius 5.54 times that of the Sun's.[1] It radiates a bolometric luminosity 692 times that of the Sun's[5] from its photosphere at an effective temperature of 11,843 K[7] HD 173047 is metal enriched with an iron abundance 126% that of the Sun's ([Fe/H] = +0.10)[6] and it is estimated to be 194 million years old.[8]

References

  1. 1 2 3 4 5 6 7 8 9 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. 1 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. S2CID 17128864.
  3. 1 2 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
  4. 1 2 3 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.
  5. 1 2 3 4 Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349–360. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. eISSN 1521-3994. ISSN 0004-6337. S2CID 111387483.
  6. 1 2 3 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.
  7. 1 2 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.
  8. 1 2 3 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.
  9. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  10. ↑ "HD 173047". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 1, 2023.
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