HD 169405
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Telescopium[1] |
| Right ascension | 18h 26m 54.01379s[2] |
| Declination | −48° 07′ 02.0638″[2] |
| Apparent magnitude (V) | +5.44[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K0.5III + F/G[4] |
| B−V color index | 0.855±0.004[3] |
| Astrometry | |
| Radial velocity (Rv) | +2.11±3.42[2] km/s |
| Proper motion (μ) | RA: +3.041±0.182[2] mas/yr Dec.: −54.895±0.169[2] mas/yr |
| Parallax (π) | 12.2045±0.2664 mas[2] |
| Distance | 267 ± 6 ly (82 ± 2 pc) |
| Absolute magnitude (MV) | 1.14[5] |
| Details | |
| Mass | 2.4[5] M☉ |
| Radius | 9.8[2] R☉ |
| Luminosity | 35[5] L☉ |
| Surface gravity (log g) | 2.94[5] cgs |
| Temperature | 5,062[5] K |
| Metallicity [Fe/H] | +0.04[5] dex |
| Rotational velocity (v sin i) | 2.7±1.7[6] km/s |
| Age | 557[2] Myr |
| Other designations | |
| CD−48°12505, GC 25150, HD 169405, HIP 90414, HR 6894, SAO 229021[7] | |
| Database references | |
| SIMBAD | data |
HD 169405 (HR 6894), is a suspected binary star[8] system in the southern constellation Telescopium, about a degree to the north of Zeta Telescopii.[9] It has an apparent magnitude of 5.44,[3] making it faintly visible to the naked eye under ideal conditions. HD 169405 is located at a distance of 267 light years[2] and is drifting away with a heliocentric radial velocity of 3.8 km/s.[3]
The visible component has a spectral classification K0.5III[4] 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.[5] 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.[6]
References
- ^ 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.
- ^ a b c d e f g h i j 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.
- ^ a b c d 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.
- ^ a b c d e f g 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.
- ^ 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.