HAT-P-21 b
Orbiting HAT-P-21
HAT-P-21 b is an exoplanet orbiting the star HAT-P-21, discovered in 2010 using the Transit method. It is a Jupiter-sized world.
Radius
12.44
Earth radii
Mass
1547.83
Earth masses
Orbital Period
4.1
days
Distance
277.3
parsecs
Radius (Earth radii)
12.44
Mass (Earth masses)
1547.83
Measured
Equilibrium Temperature
Unknown
Parameter source: Stassun et al. 2017
Orbital Period
4.124+0.000−0.000days
Planet Mass (Earth masses)
1547.83+498.99−498.99
Planet Mass (Jupiter masses)
4.8700+1.5700−1.5700
Eccentricity
0.2300+0.0200−0.0200
Radial Velocity Semi-Amplitude
548.30+14.20−14.20m/s
Distance from Earth
277.3 pc (~904 ly)
Spectral Type
Unknown
Temperature
5588 K
Mass (Solar)
1.24 M☉
Radius (Solar)
1.21 R☉
Luminosity
Unknown
Planets in System
1
Stars in System
1
Coordinates (RA, Dec)
171.2749°, 41.0280°
Discovery Method
Transit
Discovery Year
2010
Source ID: HAT-P-21 b
HAT-P-21 b orbits HAT-P-21 and was reported in 2010 and was detected with the Transit method.
Published measurements list a radius of 12.44 Earth radii, a mass of 1,547.83 Earth masses, and an orbital period of 4.12 days.
Catalog data places the system at about 277.3 parsecs from Earth and 1 known planet in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open HAT-P-21