# V991 Herculis

> long period variable

**Wikidata**: [Q92424474](https://www.wikidata.org/wiki/Q92424474)  
**Source**: https://4ort.xyz/entity/v991-herculis


## References

1. SIMBAD
2. VizieR
3. VizieR Online Data Catalog: Henry Draper Catalogue and Extension, published in Ann. Harvard Obs. 91-100 (1918-1925)
4. ASAS photometry of ROSAT sources. I. Periodic variable stars coincident with bright sources from the ROSAT All Sky Survey
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