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] |
Distance | 57.02 ± 0.02
ly (17.481 ± 0.006 pc) |
Absolute magnitude (MV) | 4.65 [2] |
Details | |
Mass | 1.04 [5] M☉ |
Radius | 1.03 [6] R☉ |
Luminosity | 1.1 [5] L☉ |
Surface gravity (log g) | 4.45 [5] cgs |
Temperature | 5,922 [5] K |
Metallicity [Fe/H] | −0.13 [4] dex |
Rotational velocity (v sin i) | 1.3 [7] km/s |
Age | 3.18 [5] Gyr |
Other designations | |
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]
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] |
Distance | 57.02 ± 0.02
ly (17.481 ± 0.006 pc) |
Absolute magnitude (MV) | 4.65 [2] |
Details | |
Mass | 1.04 [5] M☉ |
Radius | 1.03 [6] R☉ |
Luminosity | 1.1 [5] L☉ |
Surface gravity (log g) | 4.45 [5] cgs |
Temperature | 5,922 [5] K |
Metallicity [Fe/H] | −0.13 [4] dex |
Rotational velocity (v sin i) | 1.3 [7] km/s |
Age | 3.18 [5] Gyr |
Other designations | |
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]