# 杠九

> binary star system in the constellation Cassiopeia

**Wikidata**: [Q11099675](https://www.wikidata.org/wiki/Q11099675)  
**Source**: https://4ort.xyz/entity/q11099675


## References

1. SB9: The ninth catalogue of spectroscopic binary orbits
2. SIMBAD
3. MK classifications of spectroscopic binaries
4. The USNO-B Catalog
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. Gaia Early Data Release 3
7. Gaia Data Release 2
8. New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s)