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HD 169405 (HR 6894), is a suspected binary star[7] system in the southern constellation Telescopium, about a degree to the north of Zeta Telescopii.[8] It has an apparent magnitude of 5.44,[2] making it faintly visible to the naked eye under ideal conditions. HD 169405 is located at a distance of 238 light years[1] and is drifting away with a heliocentric radial velocity of 3.8 km/s.[2]

HD 169405
Observation data
Epoch J2000      Equinox J2000
Constellation Telescopium
Right ascension 18h 26m 54.01171s[1]
Declination −48° 07′ 02.0541″[1]
Apparent magnitude (V) +5.44[2]
Characteristics
Spectral type K0.5III + F/G[3]
B−V color index 0.855±0.004[2]
Astrometry
Radial velocity (Rv)+3.8±2.8[2] km/s
Proper motion (μ) RA: +4.452±0.348[1] mas/yr
Dec.: −55.619±0.351[1] mas/yr
Parallax (π)13.7205 ± 0.2257 mas[1]
Distance238 ± 4 ly
(73 ± 1 pc)
Absolute magnitude (MV)−0.47[2]
Details
Radius7.35+0.25
−0.90[1] R☉
Luminosity35.3±0.7[1] L☉
Surface gravity (log g)2.083[4] cgs
Temperature5,190+349
−86[1] K
Rotational velocity (v sin i)2.7±1.7[5] km/s
Other designations
CD−48°12505, GC 25150, HD 169405, HIP 90414, HR 6894, SAO 229021[6]
Database references
SIMBADdata

The visible component has a spectral classification K0.5III[3] which indicates that it is an evolved star just shy of being a K1 giant. At present it has expanded to 7.35[1] times the Sun's radius, shines at 35[1] solar luminosities, and has an effective temperature of 5,190 K,[1] which is high for its class. Nevertheless, this temperature gives it the yellowish-orange glow of a G-type star as opposed to class K, and spins leisurely with a projected rotational velocity of 2.7 km/s.[5]


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. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. Houk, N. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 2. Dept. of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
  4. McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433.
  5. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. S2CID 54046583.
  6. "HD 169405". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-04.
  7. 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.
  8. Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. Vol. 3. Sky Publishing Corporation and the European Space Agency. ISBN 0-933346-84-0.


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