# Eta Hydrae

> variable star in the constellation Hydra

**Wikidata**: [Q1028333](https://www.wikidata.org/wiki/Q1028333)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Eta_Hydrae)  
**Source**: https://4ort.xyz/entity/eta-hydrae


## References

1. SIMBAD
2. Spectroscopic analysis of southern B and Be stars
3. Line strengths for southerns OB stars. II. Observations with moderate dispersion
4. Application of convolutional neural networks for stellar spectral classification
5. UBV photometry of stars whose positions are accurately known
6. UBV photometry of stars whose positions are accurately known. VII
7. Catalogue of Stellar Photometry in Johnson's 11-color system
8. Gaia Data Release 2
9. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
10. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
11. New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?
12. Validation of the new Hipparcos reduction