Exoplanet

TOI-257 b

Orbiting TOI-257

Overview

TOI-257 b is an exoplanet orbiting the star TOI-257, discovered in 2021 using the Transit method. It is a Neptune-sized world.

Key Measurements

Radius

7.16

Earth radii

015 R⊕

Mass

43.86

Earth masses

0500 M⊕

Orbital Period

18.4

days

0.1d10,000d

Distance

76.9

parsecs

Nearby10,000 pc

Equilibrium Temp

1027

K

150 K3,500 K

Radius (Earth radii)

7.16

Mass (Earth masses)

43.86

Measured

Equilibrium Temperature

1027 K

Parameter source: Addison et al. 2021

Orbital Period

18.388+0.001−0.001days

Semi-Major Axis

0.1528+0.0016−0.0017au

Planet Mass (Earth masses)

43.86+7.31−7.31

Planet Mass (Jupiter masses)

0.1380+0.0230−0.0230

Eccentricity

0.0000

Epoch of Periastron

2458385.76+0.00−0.00days(BJD-TDB)

Radial Velocity Semi-Amplitude

8.50+1.40−1.40m/s

Distance from Earth

76.9 pc (~251 ly)

Spectral Type

Unknown

Temperature

6095 K

Mass (Solar)

1.41 M☉

Radius (Solar)

1.87 R☉

Luminosity

0.64 log L☉

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

47.5173°, -50.8323°

Discovery Method

Transit

Discovery Year

2021

Data Sources
NASA Exoplanet Archive

Source ID: TOI-257 b

System Context

TOI-257 b orbits TOI-257 and was reported in 2021 and was detected with the Transit method.

Published measurements list a radius of 7.16 Earth radii, a mass of 43.86 Earth masses, an orbital period of 18.39 days, and an equilibrium temperature near 1,027 K.

Catalog data places the system at about 76.9 parsecs from Earth and 1 known planet in the system.

Host star

Explore the stellar record for this system to compare temperature, spectral type, and known planets.

Open TOI-257