HD 169405

HD 169405
Location of HD 169405 (circled)
Observation data
Epoch J2000      Equinox ICRS
Constellation Telescopium
Right ascension 18h 26m 54.01379s
Declination −48° 07′ 02.0638″
Apparent magnitude (V) +5.44
Characteristics
Evolutionary stage red giant branch
Spectral type K0.5III + F/G
B−V color index 0.855±0.004
Astrometry
Radial velocity (Rv)+2.11±3.42 km/s
Proper motion (μ) RA: +3.041±0.182 mas/yr
Dec.: −54.895±0.169 mas/yr
Parallax (π)12.2045±0.2664 mas
Distance267 ± 6 ly
(82 ± 2 pc)
Absolute magnitude (MV)1.14
Details
Mass2.4 M☉
Radius9.8 R☉
Luminosity35 L☉
Surface gravity (log g)2.94 cgs
Temperature5,062 K
Metallicity [Fe/H]+0.04 dex
Rotational velocity (v sin i)2.7±1.7 km/s
Age557 Myr
Other designations
CD−48°12505, GC 25150, HD 169405, HIP 90414, HR 6894, SAO 229021
Database references
SIMBADdata

HD 169405 (HR 6894), is a suspected binary star system in the southern constellation Telescopium, about a degree to the north of Zeta Telescopii. It has an apparent magnitude of 5.44, making it faintly visible to the naked eye under ideal conditions. HD 169405 is located at a distance of 267 light years and is drifting away with a heliocentric radial velocity of 3.8 km/s.

The visible component has a spectral classification K0.5III 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. 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.

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 9 10 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. ↑ "HD 169405". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-04.
  8. ↑ 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.
  9. ↑ 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.