# Gliese 21

> star

**Wikidata**: [Q15875718](https://www.wikidata.org/wiki/Q15875718)  
**Source**: https://4ort.xyz/entity/gliese-21


## References

1. A catalogue of bright (K < 9) M dwarfs
2. SIMBAD
3. HADES RV programme with HARPS-N at TNG. XII. The abundance signature of M dwarf stars with planets
4. Fourth USNO CCD Astrograph Catalog
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. Gaia Early Data Release 3
7. Extrasolar Planets Encyclopaedia
8. HADES RV Programme with HARPS-N at TNG. XV. Planetary occurrence rates around early-M dwarfs
9. Gaia Data Release 2. The catalogue of radial velocity standard stars
10. Gaia Data Release 2