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HD 193664
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Draco
Right ascension	20h 17m 31.328s
Declination	+66° 51′ 13.28″
Apparent magnitude (V)	5.93
Characteristics
Spectral type	G3 V
U−B color index	+0.06
B−V color index	+0.58
Astrometry
Radial velocity (Rv)	−4.7 km/s
Proper motion (μ)	RA: +468.684 mas/yr ; Dec.: +297.589 mas/yr
Parallax (π)	57.2041 ± 0.0208 mas
Distance	57.02 ± 0.02 ly ; (17.481 ± 0.006 pc)
Absolute magnitude (MV)	4.65
Details
Mass	1.04 M☉
Radius	1.03 R☉
Luminosity	1.1 L☉
Surface gravity (log g)	4.45 cgs
Temperature	5,922 K
Metallicity [Fe/H]	−0.13 dex
Rotational velocity (v sin i)	1.3 km/s
Age	3.18 Gyr
Other designations
	BD+66°1281, HD 193664, HIP 100017, HR 7783, SAO 18796
Database references
SIMBAD	data

HD 193664 a star in the northern constellation of Draco. HD 193664 is its Henry Draper Catalogue designation. 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 yield an estimated distance of 57 light years.^[1] It has a relatively large proper motion of 0.558 arc seconds per year across the sky,^[9] and is drifting closer to the Sun with a radial velocity of −4.7 km/s.^[4]

This star is considered a solar analog—meaning that it is photometrically analogous to the Sun—and it displays no significant variability.^[10] 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 3.2 billion years old.^[5] The effective temperature of the stellar atmosphere is 5,922 K,^[5] giving it the yellow-hued glow of a G-type star.^[11]

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).^[12] This is member of the thin disk population of stars that lie near the galactic plane.^[4]

References

^ ^a ^b ^c ^d ^e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^a ^b ^c ^d ^e 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.
^ ^a ^b 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, S2CID 122700080.
^ ^a ^b ^c ^d ^e 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, S2CID 118751608.
^ ^a ^b ^c ^d ^e ^f ^g Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal, 153 (1): 19, arXiv:1611.02897, Bibcode:2017AJ....153...21L, doi:10.3847/1538-3881/153/1/21, S2CID 119511744, 21.
^ 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, S2CID 18775378.
^ 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". SIMBAD. 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, S2CID 2603568.
^ 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, archived from the original on March 18, 2012, 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, S2CID 46328823, A40.