Exoplanet

TOI-5817 b

Orbiting TOI-5817

Overview

TOI-5817 b is an exoplanet orbiting the star TOI-5817, discovered in 2025 using the Transit method. It is a Mini-Neptune world.

Key Measurements

Radius

3.08

Earth radii

015 R⊕

Mass

10.30

Earth masses

0500 M⊕

Orbital Period

15.6

days

0.1d10,000d

Distance

80.8

parsecs

Nearby10,000 pc

Equilibrium Temp

950

K

150 K3,500 K

Radius (Earth radii)

3.08

Mass (Earth masses)

10.30

Measured

Equilibrium Temperature

950 K

Parameter source: Naponiello et al. 2025

Orbital Period

15.610+0.000−0.000days

Semi-Major Axis

0.1223+0.0060−0.0060au

Planet Mass (Earth masses)

10.30+1.40−1.30

Planet Mass (Jupiter masses)

0.0324+0.0044−0.0041

Eccentricity

<0.2

Radial Velocity Semi-Amplitude

2.69+0.35−0.35m/s

Distance from Earth

80.8 pc (~263 ly)

Spectral Type

G2 IV-V

Temperature

5770 K

Mass (Solar)

0.97 M☉

Radius (Solar)

1.43 R☉

Luminosity

0.31 log L☉

Planets in System

1

Stars in System

2

Coordinates (RA, Dec)

322.3778°, 21.4745°

Discovery Method

Transit

Discovery Year

2025

Data Sources
NASA Exoplanet Archive

Source ID: TOI-5817 b

System Context

TOI-5817 b orbits TOI-5817 and was reported in 2025 and was detected with the Transit method.

Published measurements list a radius of 3.08 Earth radii, a mass of 10.3 Earth masses, an orbital period of 15.61 days, and an equilibrium temperature near 950 K.

Catalog data places the system at about 80.8 parsecs from Earth, a host star classified as G2 IV-V, 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-5817