# HD 153221

> double star in the constellation Ara

**Wikidata**: [Q389417](https://www.wikidata.org/wiki/Q389417)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/HD_153221)  
**Source**: https://4ort.xyz/entity/hd-153221


## References

1. Washington Double Star Catalog
2. VizieR
3. Catalogue of two dimentional spectral types for the HD stars, Vol. 2
4. SIMBAD
5. Freebase Data Dumps. 2013
6. Fourth USNO CCD Astrograph Catalog
7. Gaia Data Release 2
8. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
9. Validation of the new Hipparcos reduction
10. Ca II HK emission in rapidly rotating stars