# Sigma Orionis

> five-star system in the constellation Orion

**Wikidata**: [Q14224](https://www.wikidata.org/wiki/Q14224)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Sigma_Orionis)  
**Source**: https://4ort.xyz/entity/sigma-orionis


## References

1. SIMBAD
2. A spectroscopic census in young stellar regions: the {sigma} Orionis cluster
3. Freebase Data Dumps. 2013
4. Catalogue of Stellar Photometry in Johnson's 11-color system
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. Gaia Early Data Release 3
7. Validation of the new Hipparcos reduction
8. Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations
9. Gaia Data Release 2
10. Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff
11. Fourth USNO CCD Astrograph Catalog