# HAT-P-21 b

> exoplanet in the constellation Ursa Major

**Wikidata**: [Q84457365](https://www.wikidata.org/wiki/Q84457365)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/HAT-P-21b)  
**Source**: https://4ort.xyz/entity/hat-p-21-b


## References

1. SIMBAD
2. Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes
3. HAT-P-20b-HAT-P-23b: four massive transiting extrasolar planets
4. TESS Transit Timing of Hundreds of Hot Jupiters
5. The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets
6. Empirical Limb-darkening Coefficients and Transit Parameters of Known Exoplanets from TESS
7. ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations
8. Extrasolar Planets Encyclopaedia
9. Exoplanet Archive
10. Gaia Data Release 2