# Q66631409
**Wikidata**: [Q66631409](https://www.wikidata.org/wiki/Q66631409)  
**Source**: https://4ort.xyz/entity/q66631409


## References

1. SIMBAD
2. The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright southern stars
3. UBVRI and H-alpha photometry of the young open cluster NGC 6231
4. Gaia Data Release 2
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Radial velocities: The Wilson-Evans-Batten catalogue
7. The interstellar Ca II distance scale