HD 169405
Observation data
Epoch J2000      Equinox J2000
Constellation Telescopium
Right ascension 18h 26m 54.01379s[1]
Declination −48° 07′ 02.0638″[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)+2.11±3.42[1] km/s
Proper motion (μ) RA: +3.041±0.182[1] mas/yr
Dec.: −54.895±0.169[1] mas/yr
Parallax (π)12.2045 ± 0.2664 mas[1]
Distance267 ± 6 ly
(82 ± 2 pc)
Absolute magnitude (MV)1.14[4]
Details
Mass2.4[4] M☉
Radius9.8[1] R☉
Luminosity35[4] L☉
Surface gravity (log g)2.94[4] cgs
Temperature5,062[4] K
Metallicity [Fe/H]+0.04[4] dex
Rotational velocity (v sin i)2.7±1.7[5] km/s
Age557[1] Myr
Other designations
CD−48°12505, GC 25150, HD 169405, HIP 90414, HR 6894, SAO 229021[6]
Database references
SIMBADdata

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 267 light years[1] and is drifting away with a heliocentric radial velocity of 3.8 km/s.[2]

The visible component has a spectral classification K0.5III[3] which indicates that it is an evolved star between a K0 and K1 giant. It has expanded to ten times the Sun's radius, shines at 35 solar luminosities, and has an effective temperature of 5,062 K.[4] This temperature gives it the yellowish-orange glow of a K-type star, and it spins slowly with a projected rotational velocity of 2.7 km/s.[5]

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 3 4 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. 1 2 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. 1 2 3 4 5 6 7 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy and Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. S2CID 245440163.
  5. 1 2 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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