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| 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 type | K7V1 |
| U-B color index | 1.29 |
| B-V color index | 1.37 |
| Variable type | Suspected |
| 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 |
| Distance | 31.9 ± 0.3 ly (9.77 ± 0.08 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.
References
- ^ Wilson, O. C. (1962). "Relationship between colors and spectra of late main-sequence stars". Astrophysical Journal 136: 793–799. doi:, http://adsabs.harvard.edu/abs/1962ApJ...136..793W. Retrieved on 18 October 2007.
- ^ Kukarkin, B. V. et al (1981). Catalogue of suspected variable stars. Moscow, USSR: Academy of Sciences.
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