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[1] mas |
Distance | 238 ± 4 ly (73 ± 1 pc) |
Absolute magnitude (MV) | −0.47[2] |
Details | |
Radius | 7.35+0.25 −0.90[1] R☉ |
Luminosity | 35.3±0.7[1] L☉ |
Surface gravity (log g) | 2.083[4] cgs |
Temperature | 5,190+349 −86[1] K |
Rotational velocity (v sin i) | 2.7±1.7[5] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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]
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[]
- ^ a b c d e f g h i j k l 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.
- ^ a b c d e f 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.
- ^ a b 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.
- ^ 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.
- ^ a b 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.
- ^ "HD 169405". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-04.
- ^ 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.
- ^ 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.
- K-type giants
- Telescopium (constellation)
- Durchmusterung objects
- Henry Draper Catalogue objects
- Hipparcos objects
- HR objects