# X Hydrae

> variable star in the constellation Hydra

**Wikidata**: [Q59054471](https://www.wikidata.org/wiki/Q59054471)  
**Source**: https://4ort.xyz/entity/x-hydrae


## References

1. General Catalogue of Variable Stars
2. SIMBAD
3. Revised catalog of spectra of Mira variables of types Me and Se
4. Gaia Data Release 3
5. The All Sky Automated Survey. Variable Stars in the 0h - 6h Quarter of the Southern Hemisphere
6. The ASAS-SN Catalog of Variable Stars II: Uniform Classification of 412,000 Known Variables
7. The first INTEGRAL-OMC catalogue of optically variable sources
8. Catalogue of Stellar Photometry in Johnson's 11-color system
9. Long-period High-amplitude Red Variables in the KELT Survey
10. Gaia Early Data Release 3
11. Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations
12. Gaia Data Release 2