Temperature
4660 K
4650 to 4660
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Stellar HostProfile
NGTS-21
K3 V • 592.9 pc
Records
3
literature rows
Planets
1
system count
References
4
distinct source labels
TIC: TIC 441422655
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: Alves et al. 2022 • System source: TICv8
Mass
0.72 Msun
0.72 to 0.74
Radius
0.86 Rsun
0.83 to 0.86
Age
10.02 Gyr
single adopted value
Distance
592.9 pc
single adopted value
Spectral Type
K3 V
Consistent across records
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.86 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
NGTS-21
0.86 R☉
System Layout
Known planets
1 planets linked to this host
NGTS-21 b
Transit
◌
Discovery
2022
Period
1.54 days
Radius
14.91 R⊕
Mass
750.1 M⊕
Eq. Temp
1357 K
NGTS-21 b: A Giant Planet Orbiting a Cool Dwarf
NGTS-21 is a K3 V star located 1930 light-years away. Its reported mass of 0.72 solar masses is smaller than the Sun's, and its radius of 0.86 solar radii is likewise smaller. At 4660 K, the star is cooler than the Sun, and it is estimated to be 10 billion years old. One planet orbits this host.
That planet is NGTS-21 b, a Jupiter-like world discovered by transit in 2022. Its radius of 14.9 Earth radii is larger than Earth's. Its mass of 750 Earth masses is larger than Earth's and roughly 2.36 times Jupiter's mass. The planet completes an orbit in 1.54 days. Its mean density is 1.25 g/cm³, 0.226 times Earth's.
Provenance
Underlying measurements and references
Evidence Summary
Rows
3
Stellar refs
3
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositystable
Surface Gravitydisputed
Metallicitystable
Spectral Typestable