# 20 Persei

> star in the constellation Perseus

**Wikidata**: [Q10938415](https://www.wikidata.org/wiki/Q10938415)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/20_Persei)  
**Source**: https://4ort.xyz/entity/20-persei


## References

1. Washington Double Star Catalog
2. SIMBAD
3. New Catalogue of Suspected Variable Stars
4. MK classification of 142 visual binaries
5. MK classifications of spectroscopic binaries
6. The Tycho-2 catalogue of the 2.5 million brightest stars
7. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
8. Gaia Data Release 2
9. Validation of the new Hipparcos reduction
10. Ca II HK emission in rapidly rotating stars
11. New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s)