Planet TOI-5817 b

Detailed information about planet TOI-5817 b and its parameters.

Planet parameters Publications Observability Predictor Exo3D

Planet

Name

TOI-5817 b

Planet Status

Confirmed

Discovered in

2025

Publication Status

—

Update

2026-07-24

Mass

0.0324 (\begin{matrix} + 0.0044 \\ - 0.0041 \end{matrix})

M_J 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Mass*sin(i)

—

Semi-Major Axis

0.1223 (\pm 0.006)

AU 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Orbital Period

15.61031 (\begin{matrix} + 0.00012 \\ - 0.0001 \end{matrix})

day 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Eccentricity

0.2 (\begin{matrix} + 0.0 \\ - 0.2 \end{matrix})

1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Angular distance

—

ω

—

T_peri

—

Radius

0.2748 (\pm 0.0125)

R_J 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Inclination

88.72 (\begin{matrix} + 0.43 \\ - 0.34 \end{matrix})

deg 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Detection Method

Primary Transit

Mass Meas. Method

Radial Velocity

Radius Meas. Method

Primary Transit

Primary transit

2459799.3065 (\pm 0.0029)

Secondary transit

—

λ

—

Impact Parameter b

0.41 (\begin{matrix} + 0.09 \\ - 0.13 \end{matrix})

1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Time V_r=0

—

Velocity Semiamplitude K

2.69 (\pm 0.35)

m/s 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Calculated temperature

950.0 (\begin{matrix} + 21.0 \\ - 18.0 \end{matrix})

K 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

HD 204660 b

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

No remarks

No link

Star

Name

TOI-5817

Distance

80.34 (\pm 0.14)

pc 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Spectral type

G2IV-V

Apparent magnitude V

8.7

Apparent magnitude I

—

Apparent magnitude J

—

Apparent magnitude H

—

Apparent magnitude K

—

Mass

0.97 (\begin{matrix} + 0.072 \\ - 0.055 \end{matrix})

M_Sun 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Age

9.7 (\begin{matrix} + 2.3 \\ - 2.5 \end{matrix})

Gyr 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Effective temperature

5770.0 K 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Radius

1.427 (\begin{matrix} + 0.043 \\ - 0.04 \end{matrix})

R_Sun 1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Metallicity [Fe/H]

-0.24 (\pm 0.09)

1 publication

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

21:29:30.7

Dec₂₀₀₀

+21:28:28.3

Alternate Names

HD 204660, HIP 106097

No remarks

No link

Simbad
Most recent references (ADS)

Planet TOI-5817 b

Planet

Basic informations 30 parameters

Atmospheric parameters : Temperatures 0 temperatures

Atmospheric parameters : Molecules 0 molecules

Remarks No remark

Other web pages No page

Star

Basic informations 17 parameters

Planetary system 1 planet

Remarks No remark

Other web pages No page

More data 2 references

Planet TOI-5817 b

Planet

Basic informations 30 parameters

Atmospheric parameters : Temperatures 0 temperatures

Atmospheric parameters : Molecules 0 molecules

Remarks No remark

Other web pages No page

Star

Basic informations 17 parameters

Planetary system 1 planet

Remarks No remark

Other web pages No page

More data 2 references

Related publications

The Hot-Neptune Initiative (HONEI) I. Two hot sub-Neptunes on a close-in, eccentric orbit (TOI-5800 b) and a farther-out, circular orbit (TOI-5817 b)