Temperature
6095 K
6095 to 6382.7
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Stellar HostProfile
TOI-257
Unclassified star • 76.90 pc
Records
3
literature rows
Planets
1
system count
References
4
distinct source labels
TIC: TIC 200723869HD: HD 19916
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: Addison et al. 2021 • System source: TICv8
Mass
1.41 Msun
1.28 to 1.41
Radius
1.87 Rsun
1.77 to 1.87
Luminosity
0.64 log(Lsun)
0.64 to 0.67
Distance
76.90 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 1.87 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
TOI-257
1.87 R☉
System Layout
Known planets
1 planets linked to this host
TOI-257 b
Transit
◌
Discovery
2021
Period
18.39 days
Radius
7.16 R⊕
Mass
43.86 M⊕
Eq. Temp
1027 K
TOI-257 b: A Giant Planet Orbiting a Larger, Hotter Star
TOI-257 is a star 251 light-years away with one known planet, TOI-257 b. The host star has a mass of 1.41 solar masses, a radius of 1.87 solar radii, and a temperature of 6100 K. Its mass, radius, and temperature estimates are each larger or hotter than the Sun's corresponding values.
TOI-257 b is a Jupiter-like planet discovered by transit in 2021, when the planet's passage in front of the star from our viewpoint produced a small dip in observed brightness. It completes an orbit every 18.4 days. The planet has a radius of 7.16 Earth radii, larger than Earth's, and a mass of 43.9 Earth masses, also larger than Earth's. Its mean density is 0.658 g/cm³, 0.119 times Earth's.
Provenance
Underlying measurements and references
Evidence Summary
Rows
3
Stellar refs
3
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitystable