HD 193664

HD 193664
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Draco
Right ascension 20h 17m 31.328s[1]
Declination +66° 51′ 13.28″[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: +468.684 mas/yr[1]
Dec.: +297.589 mas/yr[1]
Parallax (π)57.2041 ± 0.0208 mas[1]
Distance57.02 ± 0.02 ly
(17.481 ± 0.006 pc)
Absolute magnitude (MV)4.65[2]
Details
Mass1.04[5] M☉
Radius1.03[6] R☉
Luminosity1.1[5] L☉
Surface gravity (log g)4.45[5] cgs
Temperature5,922[5] K
Metallicity [Fe/H]−0.13[4] dex
Rotational velocity (v sin i)1.3[7] km/s
Age3.18[5] Gyr
Other designations
BD+66°1281, HD 193664, HIP 100017, HR 7783, SAO 18796[8]
Database references
SIMBADdata

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]

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