# 55 Hydrae

> star in the constellation Hydra

**Wikidata**: [Q1029138](https://www.wikidata.org/wiki/Q1029138)  
**Source**: https://4ort.xyz/entity/55-hydrae


## References

1. SIMBAD
2. Source
3. The Tycho-2 catalogue of the 2.5 million brightest stars
4. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
5. Gaia Early Data Release 3
6. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
7. Rotational velocities of A-type stars. III. Velocity distributions
8. Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i
9. Gaia Data Release 2
10. Rotational velocities of A-type stars. IV. Evolution of rotational velocities