# ET Hydrae

> RR Lyrae variable star in the constellation Hydra

**Wikidata**: [Q85361405](https://www.wikidata.org/wiki/Q85361405)  
**Source**: https://4ort.xyz/entity/et-hydrae


## References

1. SIMBAD
2. Gaia Data Release 3
3. Automated variable star classification using the Northern Sky Variability Survey
4. General Catalogue of Variable Stars, 3rd ed.
5. Characteristics of bright AB-type RR Lyrae stars from the ASAS and WASP surveys
6. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
7. The Tycho-2 catalogue of the 2.5 million brightest stars
8. Gaia Early Data Release 3
9. Gaia Data Release 2