# BI Hydrae

> RR Lyrae variable star in the constellation Hydra

**Wikidata**: [Q81164015](https://www.wikidata.org/wiki/Q81164015)  
**Source**: https://4ort.xyz/entity/bi-hydrae


## References

1. SIMBAD
2. Gaia Data Release 3
3. Discovery of ~9,000 new RR Lyrae in the southern Catalina surveys
4. Gaia Data Release 2
5. The Tycho-2 catalogue of the 2.5 million brightest stars
6. Third U.S. Naval Observatory CCD Astrograph Catalog (UCAC3)
7. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
8. Gaia Early Data Release 3