# V640 Herculis

> star in the constellation Hercules

**Wikidata**: [Q11123815](https://www.wikidata.org/wiki/Q11123815)  
**Source**: https://4ort.xyz/entity/v640-herculis


## References

1. SIMBAD
2. Catalogue of stellar spectral classifications
3. Washington Double Star Catalog
4. Catalogue of Stellar Photometry in Johnson's 11-color system
5. Gaia Early Data Release 3
6. Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data
7. Gaia Data Release 2