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, 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. It has a relatively large proper motion of 0.558 arc seconds per year across the sky.

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 3.9 billion years old. The effective temperature of the stellar atmosphere is 5,915 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.
Q111130
Henry Draper Catalogue
MEDIA
Q8928
constellation
Concept
Q8675
Draco
CEL
Q124313
apparent magnitude
Concept
Q2722595
Bortle Scale
Concept
Q906561
Parallax
Concept
Q555846
Hipparcos
MISC
Q531
light year
Concept
Q193223
proper motion
Concept
Q12097402
arc second
Concept
Q112881
solar analog
CEL
Q1073340
photometrically
Concept
Q6243
variability
Concept
Q5864
G-type main sequence star
Concept
Q25377588
stellar classification
Concept
Q217030
metallicity
Concept
Q854050
effective temperature
Concept
Q6311
stellar atmosphere
Concept
Q1396651
infrared excess
UNK
Q3235978
circumstellar disk
Concept
Q5571730
thin disk population
UNK
Q3239165
galactic plane
Concept
Q9001726
HD 193664
CEL
Q9001726
HD 193664
CEL
Q9001726
HD 193664
CEL
2012-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2012
DATE
+5.93^^http://www.w3.org/2001/XMLSchema#decimal
5.93
NUMBER
+57.3^^http://www.w3.org/2001/XMLSchema#decimal
57.3
NUMBER
+0.558^^http://www.w3.org/2001/XMLSchema#decimal
0.558
NUMBER
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
+3.9^^http://www.w3.org/2001/XMLSchema#decimal
3.9
NUMBER
constellation
apparent magnitude
instance of
instance of