# 57 UMa A
**Wikidata**: [Q66477209](https://www.wikidata.org/wiki/Q66477209)  
**Source**: https://4ort.xyz/entity/57-uma-a


## References

1. SIMBAD
2. Washington Double Star Catalog
3. The Tycho-2 catalogue of the 2.5 million brightest stars
4. Fourth USNO CCD Astrograph Catalog
5. Gaia Data Release 2
6. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)