# BD+20°2457

> star in the constellation Leo

**Wikidata**: [Q1753582](https://www.wikidata.org/wiki/Q1753582)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/BD+20_2457)  
**Source**: https://4ort.xyz/entity/bd-20-2457


## References

1. SIMBAD
2. Freebase Data Dumps. 2013
3. The Tycho-2 catalogue of the 2.5 million brightest stars
4. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
5. Gaia Early Data Release 3
6. Gaia Data Release 2
7. Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes
8. The metallicity signature of evolved stars with planets
9. SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs
10. Evolved stars and the origin of abundance trends in planet hosts
11. Age consistency between exoplanet hosts and field stars
12. The Penn State-Toruń Centre for Astronomy Planet Search stars
13. The Penn State - Torun Centre for Astronomy Planet Search stars. IV. Dwarfs and the complete sample