Astronomy:HD 208177
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Short description: Double star system in the constellation Aquarius
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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.) | |
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]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 2.0 2.1 2.2 2.3 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
- ↑ 3.0 3.1 Malaroda, S. (August 1975), "Study of the F-type stars. I. MK spectral types", Astronomical Journal 80: 637–641, doi:10.1086/111786, Bibcode: 1975AJ.....80..637M
- ↑ 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. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 5.0 5.1 5.2 5.3 Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal 147 (4): 14, doi:10.1088/0004-6256/147/4/87, 87, Bibcode: 2014AJ....147...87T
- ↑ 6.0 6.1 6.2 6.3 6.4 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. doi:10.1051/0004-6361/201016276. Bibcode: 2011A&A...530A.138C.
- ↑ 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, doi:10.1134/S1063773708060054, Bibcode: 2008AstL...34..405K
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