# HP Hydrae

> RR Lyrae variable star in the constellation Hydra

**Wikidata**: [Q87136130](https://www.wikidata.org/wiki/Q87136130)  
**Source**: https://4ort.xyz/entity/hp-hydrae


## References

1. SIMBAD
2. Gaia Data Release 3
3. Machine-learned Identification of RR Lyrae Stars from Sparse, Multi-band Data: The PS1 Sample
4. Discovery of ~9,000 new RR Lyrae in the southern Catalina surveys
5. The Pan-STARRS release 1 (PS1) Survey - DR1
6. A catalog of candidate field horizontal-branch and A-type stars. III. A 2MASS-cleaned version
7. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
8. Fourth USNO CCD Astrograph Catalog
9. Gaia Early Data Release 3
10. Spectroscopy of hot stars in the galactic halo. III. Analysis of a large sample of field horizontal-branch and other A-type stars
11. Gaia Data Release 2