# V644 Herculis

> star in the constellation Hercules

**Wikidata**: [Q11123818](https://www.wikidata.org/wiki/Q11123818)  
**Source**: https://4ort.xyz/entity/v644-herculis


## References

1. SIMBAD
2. VizieR
3. MK classifications of spectroscopic binaries
4. The Tycho-2 catalogue of the 2.5 million brightest stars
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. Gaia Early Data Release 3
7. Gaia Data Release 2
8. Lithium in early F dwarfs
9. A revised catalogue of δ Sct stars
10. New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s)