HD 193664
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Draco |
| Right ascension | 20h 17m 31.32803s[1] |
| Declination | +66° 51′ 13.2720″[1] |
| Apparent magnitude (V) | 5.93[2] |
| Characteristics | |
| Spectral type | G3 V[3] |
| U−B color index | +0.06[2] |
| B−V color index | +0.58[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.7[4] km/s |
| Proper motion (μ) | RA: +468.58[1] mas/yr Dec.: +296.61[1] mas/yr |
| Parallax (π) | 56.92 ± 0.24[1] mas |
| Distance | 57.3 ± 0.2 ly (17.57 ± 0.07 pc) |
| Absolute magnitude (MV) | 4.65[2] |
| Details | |
| Mass | 1.011[4] M☉ |
| Radius | 1.03[5] R☉ |
| Surface gravity (log g) | 4.43[4] cgs |
| Temperature | 5,915[4] K |
| Metallicity [Fe/H] | −0.13[4] dex |
| Rotational velocity (v sin i) | 1.3[6] km/s |
| Age | 3.91[4] Gyr |
| Other designations | |
HD 193664 is the Henry Draper Catalogue designation for a star in the northern constellation of Draco. With an apparent magnitude of 5.93,[2] according to the Bortle Scale it is visible to the naked eye from suburban skies. Parallax measurements by the Hipparcos spacecraft yield an estimated distance of 57.3 light years.[1] It has a relatively large proper motion of 0.558 arc seconds per year across the sky.[8]
This star is considered a solar analog—meaning that it is photometrically analogous to the Sun—and it displays no significant variability.[9] It is a G-type main sequence star with a stellar classification of G3V.[3] Both the mass and radius of HD 193664 differ from those of the Sun by just a few percent, although it has a somewhat lower metallicity.[4] It may be around the same age as the Sun, being an estimated 3.9 billion years old.[4] The effective temperature of the stellar atmosphere is 5,915 K,[4] giving it the yellow-hued glow of a G-type star.[10]
HD 193664 has been examined for signs of an infrared excess that could indicate the presence of a circumstellar disk of dust, but none has been found (as of 2012).[11] This is member of the thin disk population of stars that lie near the galactic plane.[4]
References
- 1 2 3 4 5 6 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.
- 1 2 3 4 5 Karatas, Y.; Schuster, W. J. (October 2006), "Metallicity and absolute magnitude calibrations for UBV photometry", Monthly Notices of the Royal Astronomical Society 371 (4): 1793−1812, Bibcode:2006MNRAS.371.1793K, doi:10.1111/j.1365-2966.2006.10800.x.
- 1 2 Shenavrin, V. I.; et al. (2011), "Search for and study of hot circumstellar dust envelopes", Astronomy Reports 55 (1): 31–81, Bibcode:2011ARep...55...31S, doi:10.1134/S1063772911010070.
- 1 2 3 4 5 6 7 8 9 10 Ramírez, I.; et al. (February 2013), "Oxygen abundances in nearby FGK stars and the galactic chemical evolution of the local disk and halo", The Astrophysical Journal 764 (1): 78, arXiv:1301.1582, Bibcode:2013ApJ...764...78R, doi:10.1088/0004-637X/764/1/78.
- ↑ Takeda, Genya; et al. (February 2007), "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog", The Astrophysical Journal Supplement Series 168 (2): 297–318, arXiv:astro-ph/0607235, Bibcode:2007ApJS..168..297T, doi:10.1086/509763.
- ↑ Valenti, Jeff A.; Fischer, Debra A. (July 2005), "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs", The Astrophysical Journal Supplement Series 159 (1): 141–166, Bibcode:2005ApJS..159..141V, doi:10.1086/430500.
- ↑ "HD 193664 -- High proper-motion Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2015-11-13.
- ↑ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal 129 (3): 1483−1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.
- ↑ Metlov, V. G. (January 2003), "Photoelectric Observations of Bright Solar Type Stars", Astronomical and Astrophysical Transactions 22 (1): 47−50, Bibcode:2003A&AT...22...47M, doi:10.1080/1055679021000020020.
- ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16.
- ↑ Maldonado, J.; et al. (May 2012), "Metallicity of solar-type stars with debris discs and planets⋆", Astronomy & Astrophysics 541: 10, arXiv:1202.5884, Bibcode:2012A&A...541A..40M, doi:10.1051/0004-6361/201218800, A40.
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