# PR Hydrae

> long-period variable star in the constellation Hydra

**Wikidata**: [Q77817455](https://www.wikidata.org/wiki/Q77817455)  
**Source**: https://4ort.xyz/entity/pr-hydrae


## References

1. SIMBAD
2. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+, 2007-2017)
3. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
4. The Tycho-2 catalogue of the 2.5 million brightest stars
5. Gaia Early Data Release 3
6. Gaia Data Release 3
7. Gaia Data Release 2