# HD 31331

> binary star system in the constellation Orion

**Wikidata**: [Q666038](https://www.wikidata.org/wiki/Q666038)  
**Source**: https://4ort.xyz/entity/hd-31331


## References

1. SIMBAD
2. SB9: The ninth catalogue of spectroscopic binary orbits
3. [VizieR](https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ6495cfd933558f&-out.add=.&-source=VI/42/out&-c=072.1063%20%2b00.2626,eq=B1875,rs=2)
4. Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5
5. The Tycho-2 catalogue of the 2.5 million brightest stars
6. Gaia Data Release 2
7. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
8. A stellar rotation census of B stars: from ZAMS to TAMS