Temperature
3430 K
3430 to 3446
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Stellar HostProfile
TOI-2257
M3 • 57.79 pc
Records
3
literature rows
Planets
1
system count
References
4
distinct source labels
TIC: TIC 198485881
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: Schanche et al. 2022 • System source: TICv8
Mass
0.33 Msun
0.31 to 0.33
Radius
0.31 Rsun
0.31 to 0.33
Distance
57.79 pc
single adopted value
Spectral Type
M3
Consistent across records
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.31 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
TOI-2257
0.31 R☉
System Layout
Known planets
1 planets linked to this host
TOI-2257 b
Transit
◌
Discovery
2021
Period
35.19 days
Radius
2.19 R⊕
Mass
—
Eq. Temp
256 K
TOI-2257: A Nearby Red Dwarf and Its Super-Earth
TOI-2257 is an M3 red dwarf located 188 light-years away. Its mass is 0.328 solar masses, its radius is 0.313 solar radii, and its temperature is 3430 K. The star's reported mass and radius estimates are smaller than the Sun's, and its reported temperature is cooler than the Sun's. One planet is known to orbit this host.
That planet, TOI-2257 b, is a Super-Earth discovered by the transit method in 2021. A transit occurs when a planet passes in front of its star from our viewpoint, causing a small dip in observed brightness. TOI-2257 b has an orbital period of 35.2 days and a radius of 2.19 Earth radii, which is larger than Earth's. Its size class compares its radius with Earth's: a Super-Earth reaches 2.5 times Earth's radius.
Provenance
Underlying measurements and references
Evidence Summary
Rows
3
Stellar refs
3
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositystable
Surface Gravitydisputed
Metallicitystable
Spectral Typestable