# V921 Herculis
**Wikidata**: [Q80836216](https://www.wikidata.org/wiki/Q80836216)  
**Source**: https://4ort.xyz/entity/v921-herculis


## References

1. SIMBAD
2. VizieR Online Data Catalog: Henry Draper Catalogue and Extension, published in Ann. Harvard Obs. 91-100 (1918-1925)
3. Up-to-date linear elements of eclipsing binaries
4. Automated variable star classification using the Northern Sky Variability Survey
5. The Tycho-2 catalogue of the 2.5 million brightest stars
6. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
7. A BVRCIC Survey of W Ursae Majoris Binaries
8. Gaia Early Data Release 3
9. APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
10. Gaia Data Release 2