# 27 Hydrae

> star system in the constellation Hydra

**Wikidata**: [Q5175237](https://www.wikidata.org/wiki/Q5175237)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/27_Hydrae)  
**Source**: https://4ort.xyz/entity/27-hydrae


## References

1. SIMBAD
2. A catalogue of multiplicity among bright stellar systems
3. Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5
4. Washington Double Star Catalog
5. Gaia Data Release 3
6. Freebase Data Dumps. 2013
7. The Tycho-2 catalogue of the 2.5 million brightest stars
8. A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars
9. Gaia Early Data Release 3
10. High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances
11. Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants
12. Rotational and radial velocities for a sample of 761 Hipparcos giants and the role of binarity
13. Ca II HK emission in rapidly rotating stars
14. Validation of the new Hipparcos reduction