Gliese 638

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Corona borealis constellation map
Gliese 638
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 16h 45m 06.3511s
Declination +33° 30′ 33.226″
Apparent magnitude (V) 8.11
Spectral type K7V[1]
U−B color index 1.29
B−V color index 1.37
Variable type Suspected
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)
Other designations
GJ 638, BD +33°2777, HD 151288, LTT 14967, SAO 65525, NSV 7951, HIP 82003.
Database references

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.[2] As a K-class star, it has a lower mass than the Sun, and consequently is less luminous.


  1. ^ 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. 
  2. ^ Kukarkin, B. V.; et al. (1981). Catalogue of suspected variable stars. Moscow, USSR: Academy of Sciences.