# HD 21903

> binary star system in the constellation Camelopardalis

**Wikidata**: [Q10849571](https://www.wikidata.org/wiki/Q10849571)  
**Source**: https://4ort.xyz/entity/q10849571


## References

1. SIMBAD
2. Washington Double Star Catalog
3. [VizieR](https://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ627abe251684c&-out.add=.&-source=VI/42/out&-c=051.2038%20%2b59.6175,eq=B1875,rs=2)
4. Visual multiples. VII. MK classifications
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. Validation of the new Hipparcos reduction
7. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
8. New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s)