HD 193664
{{Short description|Star in the constellation Draco}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000.0
| constell = Draco
}}
{{Starbox character
| variable =
}}
{{Starbox astrometry
| prop_mo_ra = +468.684
| prop_mo_dec = +297.589
| parallax = 57.2041
| p_error = 0.0208
}}
{{Starbox detail
| rotation =
}}
{{Starbox catalog
| names = {{odlist | BD=+66°1281 | HD=193664 | HIP=100017 | HR=7783 | SAO=18796 }}
}}
{{Starbox reference
| Simbad = HD+193664
}}
{{Starbox end}}
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, 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. It has a relatively large proper motion of 0.558 arc seconds per year across the sky, and is drifting closer to the Sun with a radial velocity of −4.7 km/s.
This star is considered a solar analog—meaning that it is photometrically analogous to the Sun—and it displays no significant variability. It is a G-type main sequence star with a stellar classification of G3V. 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. It may be around the same age as the Sun, being an estimated 3.2 billion years old. The effective temperature of the stellar atmosphere is 5,922 K, giving it the yellow-hued glow of a G-type star.
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). This is member of the thin disk population of stars that lie near the galactic plane.
References
{{reflist|refs=
{{Cite Gaia EDR3|2246581329639103872}}
| display-authors=1
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}}
| display-authors=1
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| doi=10.1088/0004-637X/764/1/78 | bibcode=2013ApJ...764...78R
| arxiv=1301.1582 | s2cid=118751608 | postscript=.
}}
| display-authors=1
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| doi=10.1086/509763
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| arxiv=astro-ph/0607235
| date=February 2007
| s2cid=18775378 | postscript=.
}}
| last1=Karatas | first1=Y.
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| title=Metallicity and absolute magnitude calibrations for UBV photometry
| journal=Monthly Notices of the Royal Astronomical Society
| volume=371 | issue=4 | pages=1793–1812
| date=October 2006
| doi=10.1111/j.1365-2966.2006.10800.x
| bibcode=2006MNRAS.371.1793K
| postscript=.
| doi-access=free}}
| last1=Lépine | first1=Sébastien
| last2=Shara | first2=Michael M.
| title=A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)
| journal=The Astronomical Journal
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| date=March 2005
| doi=10.1086/427854
| bibcode=2005AJ....129.1483L
| postscript=.
|arxiv = astro-ph/0412070 | s2cid=2603568
}}
| display-authors=1
| last1=Maldonado | first1=J.
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| last5=Mora | first5=A.
| title=Metallicity of solar-type stars with debris discs and planets⋆
| journal=Astronomy & Astrophysics
| volume=541 | id=A40 | pages=10
| date=May 2012
| doi=10.1051/0004-6361/201218800
| bibcode=2012A&A...541A..40M
| postscript=.
|arxiv = 1202.5884 | s2cid=46328823 }}
| last1=Metlov | first1=V. G.
| title=Photoelectric Observations of Bright Solar Type Stars
| journal=Astronomical and Astrophysical Transactions
| volume=22 | issue=1 | pages=47–50
| date=January 2003
| doi=10.1080/1055679021000020020
| bibcode=2003A&AT...22...47M
| postscript=.
}}
| last1=Valenti | first1=Jeff A.
| last2=Fischer | first2=Debra A.
| title=Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs
| journal=The Astrophysical Journal Supplement Series
| volume=159 | issue=1 | pages=141–166 |date=July 2005
| doi=10.1086/430500
| bibcode=2005ApJS..159..141V
| postscript=.
| doi-access=free
}}
| title=The Colour of Stars
| date=December 21, 2004
| work=Australia Telescope, Outreach and Education
| publisher=Commonwealth Scientific and Industrial Research Organisation
| url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html
| access-date=2012-01-16
| postscript=.
| archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html
| archive-date=March 18, 2012
| url-status=dead
}}
| title=Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants
| last1=Luck | first1=R. Earle
| journal=The Astronomical Journal
| volume=153 | issue=1 | id=21 | pages=19 | date=January 2017
| bibcode=2017AJ....153...21L | arxiv=1611.02897
| doi=10.3847/1538-3881/153/1/21 | s2cid=119511744 | doi-access=free
}}
| title=HD 193664
| access-date=2015-11-13
}}
}}
{{Stars of Draco}}
Category:G-type main-sequence stars