HD 193664
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Draco |
| Right ascension | 20h 17m 31.32803s[1] |
| Declination | +66° 51′ 13.2720″[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: +468.58[1] mas/yr Dec.: +296.61[1] mas/yr |
| Parallax (π) | 56.92 ± 0.24[1] mas |
| Distance | 57.3 ± 0.2 ly (17.57 ± 0.07 pc) |
| Absolute magnitude (MV) | 4.65[2] |
| Details | |
| Mass | 1.011[4] M☉ |
| Radius | 1.03[5] R☉ |
| Surface gravity (log g) | 4.43[4] cgs |
| Temperature | 5,915[4] K |
| Metallicity [Fe/H] | −0.13[4] dex |
| Rotational velocity (v sin i) | 1.3[6] km/s |
| Age | 3.91[4] Gyr |
| Other designations | |
HD 193664 is the Henry Draper Catalogue designation for a star in the northern constellation of Draco. 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 by the Hipparcos spacecraft yield an estimated distance of 57.3 light years.[1] It has a relatively large proper motion of 0.558 arc seconds per year across the sky.[8]
This star is considered a solar analog—meaning that it is photometrically analogous to the Sun—and it displays no significant variability.[9] 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 3.9 billion years old.[4] The effective temperature of the stellar atmosphere is 5,915 K,[4] giving it the yellow-hued glow of a G-type star.[10]
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).[11] This is member of the thin disk population of stars that lie near the galactic plane.[4]
References
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- ↑ 2.0 2.1 2.2 2.3 2.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 Lua error in package.lua at line 80: module 'strict' not found.
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