Gliese 638

Gliese 638
Observation data; Epoch J2000 Equinox J2000
Constellation	Hercules
Right ascension	16h 45m 06.35054s
Declination	+33° 30′ 33.2138″
Apparent magnitude (V)	8.11
Characteristics
Spectral type	K7V
U−B color index	1.29
B−V color index	1.37
Variable type	Suspected
Astrometry
Radial velocity (Rv)	−32.05±0.13 km/s
Proper motion (μ)	RA: -39.939 mas/yr ; Dec.: 382.224 mas/yr
Parallax (π)	101.5615±0.0150 mas
Distance	32.114 ± 0.005 ly ; (9.846 ± 0.001 pc)
Absolute magnitude (MV)	8.11
Other designations
	NSV 7951, BD+33 2777, GJ 638, HD 151288, HIP 82003, SAO 65525, G 181-6, LTT 14967
Database references
SIMBAD	data

Gliese 638 is a main sequence star in the constellation of Hercules. It is located about 32.1 light-years from the Earth. This is a suspected variable star with a measured apparent magnitude that ranges from 8.09–8.11.^[5] As a K-class star, it has a lower mass than the Sun, and consequently is less luminous.

References

^ ^a ^b ^c ^d ^e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ 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.
^ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
^ "HD 151288". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 March 2025.
^ Kukarkin, B. V.; et al. (1981). Catalogue of suspected variable stars. Moscow, USSR: Academy of Sciences.

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