Temperature
5325 K
5272.3 to 5718
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Stellar HostProfile
TOI-421
G9 V • 74.80 pc
Records
6
literature rows
Planets
2
system count
References
6
distinct source labels
TIC: TIC 94986319
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: Carleo et al. 2020 • System source: TICv8
Mass
0.85 Msun
0.83 to 0.92
Radius
0.87 Rsun
0.86 to 0.88
Age
9.40 Gyr
9.40 to 10.90
Distance
74.80 pc
single adopted value
Spectral Type
G9 V
Consistent across records
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.87 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
TOI-421
0.87 R☉
System Layout
Known planets
2 planets linked to this host
TOI-421: A Sun-Like Star and Its Two Known Planets
TOI-421 is a star system 244 light-years away. Its host star is a G9 V dwarf, a Sun-like class of main-sequence star, with a reported mass of 0.852 solar masses, a radius of 0.871 solar radii, a temperature of 5330 K, and an age of 9.4 billion years. The star's reported mass and radius estimates are both smaller than the Sun's, and its reported temperature is cooler than the Sun's. Two planets orbit this host.
TOI-421 b is a Neptune-like world discovered in 2020 by the transit method. It has a mass of 6.7 Earth masses, a radius of 2.64 Earth radii, and an orbital period of 5.2 days. Its reported radius and mass estimates are both larger than Earth's, and its mean density is 2.01 g/cm³, 0.364 times Earth's. Among the listed planets, TOI-421 b has the shortest year by reported estimates and the smallest radius and reported mass.
TOI-421 c is a Jupiter-like world, also discovered in 2020 by the transit method. It has a mass of 14.1 Earth masses, a radius of 5.09 Earth radii, and an orbital period of 16.1 days. Its reported radius and mass estimates are larger than Earth's, and its mean density is 0.589 g/cm³, 0.107 times Earth's. Among the listed planets, TOI-421 c has the longest year by reported estimates and the largest radius and reported mass.
A transit occurs when a planet crosses in front of its star from our viewpoint, dimming the observed light; repeated dips help establish these orbital periods.
Provenance
Underlying measurements and references
Evidence Summary
Rows
6
Stellar refs
5
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agedisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typestable