HD 208177
HD 208177 is a double star system in the equatorial constellation of Aquarius.[5] They are faintly visible to the naked eye with an apparent magnitude of 6.20.[2] The pair have an angular separation of 19.113″.[7] The primary component is an evolved subgiant star with a stellar classification of F5IV.[3] It has an estimated 163%[5] of the Sun's mass and is about 1.7 billion years old[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 54m 35.91630s[1] |
| Declination | −03° 18′ 04.5532″[1] |
| Apparent magnitude (V) | 6.20[2] |
| Characteristics | |
| Spectral type | F5IV[3] |
| U−B color index | 0.07[2] |
| B−V color index | 0.48[2] |
| Astrometry | |
| Radial velocity (Rv) | -20[4] km/s |
| Proper motion (μ) | RA: +29.06[1] mas/yr Dec.: −29.87[1] mas/yr |
| Parallax (π) | 16.89 ± 1.32[1] mas |
| Distance | 190 ± 20 ly (59 ± 5 pc) |
| Details | |
| Mass | 1.63[5] M☉ |
| Surface gravity (log g) | 3.94[6] cgs |
| Temperature | 6,577[6] K |
| Metallicity [Fe/H] | 0.30[6] dex |
| Age | 1.70[6] Gyr |
| Mass | 0.32[5] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
References
- van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
- Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N
- Malaroda, S. (August 1975), "Study of the F-type stars. I. MK spectral types", Astronomical Journal, 80: 637–641, Bibcode:1975AJ.....80..637M, doi:10.1086/111786
- Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, arXiv:1401.6827, Bibcode:2014AJ....147...87T, doi:10.1088/0004-6256/147/4/87, 87
- Casagrande, L.; et al. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy & Astrophysics. 530 (A138): 21. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276.
- Kiyaeva, O. V.; et al. (June 2008), "Dynamical study of wide pairs of stars based on data from the WDS catalog", Astronomy Letters, 34 (6): 405–412, Bibcode:2008AstL...34..405K, doi:10.1134/S1063773708060054
External links
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