HD 193664

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]

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
Distance57.3 ± 0.2 ly
(17.57 ± 0.07 pc)
Absolute magnitude (MV)4.65[2]
Details
Mass1.011[4] M☉
Radius1.03[5] R☉
Surface gravity (log g)4.43[4] cgs
Temperature5,915[4] K
Metallicity [Fe/H]−0.13[4] dex
Rotational velocity (v sin i)1.3[6] km/s
Age3.91[4] Gyr
Other designations
BD+66° 1281, HD 193664, HIP 100017, HR 7783, SAO 18796.[7]
Database references
SIMBADdata

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. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. "HD 193664". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-11-13.
  8. 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.
  9. 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.
  10. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-01-16.
  11. 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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