Gliese 638

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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
Characteristics
Spectral typeK7V[1]
U−B color index1.29
B−V color index1.37
Variable typeSuspected
Astrometry
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
Distance31.9 ± 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
SIMBADdata

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 8.098.11.[2] As a K-class star, it has a lower mass than the Sun, and consequently is less luminous.

References

  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. 


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