# Q77974704

> horizontal branch star in the constellation Hydra

**Wikidata**: [Q77974704](https://www.wikidata.org/wiki/Q77974704)  
**Source**: https://4ort.xyz/entity/q77974704


## References

1. SIMBAD
2. The SDSS Photometric Catalog, Release 7
3. Gaia Data Release 2
4. The Milky Way's circular velocity curve to 60 kpc and an estimate of the dark matter halo mass from the kinematics of ~2400 SDSS blue horizontal-branch stars