Planet KELT-21 Ab

Detailed information about planet KELT-21 Ab and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name
KELT-21 Ab
Planet Status
Confirmed
Discovered in
2017
Update
2024-08-05
Mass
3.88 ( ± 0.05 ) MJ
Mass*sin(i)
—
Semi-Major Axis
0.0536 ( ± 0.0016 ) AU
Orbital Period
3.6127732 ( ± 3.7e-06 ) day
Eccentricity
—
ω
—
Tperi
—
Radius
1.584 ( ± 0.034 ) RJ
Inclination
87.1 ( +0.6 -0.5 ) deg
Detection Method
Primary Transit
Mass Meas. Method
Radial Velocity
Radius Meas. Method
Primary Transit
Primary transit
2459420.24239 ( ± 0.00022 ) JD
Secondary transit
—
λ
—
Impact Parameter b
0.36 ( +0.05 -0.07 )
Time Vr=0
—
Velocity Semiamplitude K
400.0 ( +0.0 -400.0 ) m/s
Calculated temperature
2025.0 ( ± 30.0 ) K
Measured temperature
—
Hottest point longitude
—
Geometric albedo
—
Surface gravity log(g/gH)
—
Alternate Names
HD 332124 b, TOI-1198.01
Data Source Type Result Value Result Figure Notes Reference
Molecule Data Source Type Result Value Result Figure Notes Reference

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Star

Name
KELT-21 A
Distance
415.0 ( ± 50.0 ) pc
Spectral type
A8V
Apparent magnitude V
10.5
Mass
1.458 ( ± 0.029 ) MSun
Age
1.6 ( ± 0.1 ) Gyr
Effective temperature
7598.0 ( ± 84.0 ) K
Radius
1.638 ( ± 0.034 ) RSun
Metallicity [Fe/H]
-0.405 ( ± 0.033 )
Detected Disc
—
Magnetic Field
—
RA2000
20:19:12.0
Dec2000
+32:34:52.0
Alternate Names
HD 332124, TOI-1198

Part of a triple system including two M dwarf companion stars ∼500 AUs away. The low-mass pair is separated by ∼20 AUs.

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