Temperature
7598 K
7598 to 8324
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Stellar HostProfile
KELT-21
A8 V • 470.9 pc
Records
4
literature rows
Planets
1
system count
References
5
distinct source labels
HD: HD 332124TIC: TIC 203189770
Approximate color
from effective temperature
Canonical Summary
Adopted host values from one source row
Values come from the row with the most populated summary measurements. Missing values stay missing. Ranges and counts describe all source rows.
Stellar source: Johnson et al. 2018 • System source: TICv8
Mass
1.46 Msun
1.46 to 2.05
Radius
1.64 Rsun
1.64 to 1.71
Age
1.60 Gyr
single adopted value
Luminosity
0.90 log(Lsun)
0.90 to 1.10
Distance
470.9 pc
single adopted value
Spectral Type
A8 V
Consistent across records
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 1.64 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
KELT-21
1.64 R☉
System Layout
Known planets
1 planets linked to this host
KELT-21 b
Transit
◌
Discovery
2018
Period
3.61 days
Radius
17.78 R⊕
Mass
1242.7 M⊕
Eq. Temp
2051 K
KELT-21: A Distant Star with a Jupiter-Like Planet
KELT-21 is a star located 1540 light-years away with one known planet. The star is an A8 V spectral type with an age of 1.6 billion years, a mass of 1.46 solar masses, a radius of 1.64 solar radii, and a temperature of 7600 K. Its reported mass and radius estimates are larger than the Sun's, and its reported temperature is hotter than the Sun's.
The system's only known planet is KELT-21 b, a Jupiter-like world discovered by the transit method in 2018. It has an orbital period of 3.61 days. Its reported radius estimate is 17.8 Earth radii, larger than Earth's. Its mass is a reported upper limit of 1242.7153 Earth masses.
Provenance
Underlying measurements and references
Evidence Summary
Rows
4
Stellar refs
4
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitystable
Spectral Typestable