Epoch J2000 Equinox J2000
|Right ascension||16h 45m 06.3511s|
|Declination||+33° 30′ 33.226″|
|Apparent magnitude (V)||8.11|
|U−B color index||1.29|
|B−V color index||1.37|
|Radial velocity (Rv)||-29.6±0.9 km/s|
|Proper motion (μ)||RA: -39.18 mas/yr
Dec.: 383.43 mas/yr
|Parallax (π)||102.35 ± 0.88 mas|
|Distance||31.9 ± 0.3 ly
(9.77 ± 0.08 pc)
Gliese 638 is a main sequence star in the constellation of Hercules. It is located about 31.9 light years from the Earth. This is a suspected variable star with a measured apparent magnitude that ranges from 8.09–8.11. As a K-class star, it has a lower mass than the Sun, and consequently is less luminous.
- Wilson, O. C. (1962). "Relationship between colors and spectra of late main-sequence stars". Astrophysical Journal. 136: 793–799. Bibcode:1962ApJ...136..793W. doi:10.1086/147437.
- Kukarkin, B. V.; et al. (1981). Catalogue of suspected variable stars. Moscow, USSR: Academy of Sciences.
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