# Sigma Hydrae

> star in the constellation Hydra

**Wikidata**: [Q1028837](https://www.wikidata.org/wiki/Q1028837)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Sigma_Hydrae)  
**Source**: https://4ort.xyz/entity/sigma-hydrae


## References

1. SIMBAD
2. Space-velocity vectors for 3483 stars with proper motion and radial velocity
3. Photoelectric measurements of the lambda 4200 A CN band and the G band in G8-K5 spectra
4. Intensities of isotopic C bands in the spectra of 12 N-type stars
5. Distribution of the nearer bright stars in the color-luminosity array
6. Axial Rotation and Line Broadening in Stars of Spectral Types F0-K5
7. Preliminary list of photoelectric classification indices for 234 bright Northern G and K stars
8. The Spectra of the Bright Stars of Types F5-K5
9. Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5
10. Freebase Data Dumps. 2013
11. Catalogue of Stellar Photometry in Johnson's 11-color system
12. Gaia Data Release 2
13. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
14. The atmospheric parameters and spectral interpolator for the MILES stars
15. Catalogue of rotational velocities of the stars
16. Validation of the new Hipparcos reduction