# Sigma Geminorum

> binary star system in the constellation Gemini

**Wikidata**: [Q943622](https://www.wikidata.org/wiki/Q943622)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Sigma_Geminorum)  
**Source**: https://4ort.xyz/entity/sigma-geminorum


## References

1. SB9: The ninth catalogue of spectroscopic binary orbits
2. General Catalogue of Variable Stars
3. SIMBAD
4. The Perkins catalog of revised MK types for the cooler stars
5. Freebase Data Dumps. 2013
6. Catalogue of Stellar Photometry in Johnson's 11-color system
7. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
8. Gaia Data Release 3
9. Gaia Early Data Release 3
10. Rotational and radial velocities for a sample of 761 Hipparcos giants and the role of binarity
11. Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era
12. Starspots
13. Validation of the new Hipparcos reduction