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Stellar HostProfile

TOI-5817

G2 IV-V • 80.75 pc

Records

3

literature rows

Planets

1

system count

References

4

distinct source labels

TIC: TIC 418604868HD: HD 204660HIP: HIP 106097

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: Naponiello et al. 2025 • System source: TICv8

Temperature

5770 K

5770 to 5809

3 values • 2 distinct

Mass

0.97 Msun

0.97 to 1.04

2 values • 2 distinct

Radius

1.43 Rsun

1.38 to 1.43

3 values • 2 distinct

Age

9.70 Gyr

single adopted value

1 values • 1 distinct

Luminosity

0.31 log(Lsun)

0.29 to 0.31

2 values • 2 distinct

Distance

80.75 pc

single adopted value

3 values • 1 distinct

Spectral Type

G2 IV-V

Consistent across records

G2 IV-V (1)

Planets

1

Stable across source rows

1

Scale Comparison

Radius against the Sun

Current adopted radius: 1.43 R☉ (circles scaled linearly by radius)

Sun

1.0 R☉ baseline

TOI-5817

1.43 R☉

System Layout

Known planets

1 planets linked to this host

TOI-5817 b

Transit

◌

Discovery

2025

Period

15.61 days

Radius

3.08 R⊕

Mass

10.30 M⊕

Eq. Temp

950 K

TOI-5817 b: A Neptune-Like World Orbiting a Distant Star

TOI-5817 is a star 263 light-years away with a spectral type of G2 IV-V. Its mass is 0.97 solar masses and its radius is 1.43 solar radii, meaning the star's reported radius estimate is larger than the Sun's. Its temperature is 5770 K, and its age is 9.7 billion years. One planet is known to orbit this host.

That planet, TOI-5817 b, was discovered in 2025 by the transit method, in which a planet passes in front of its star from our viewpoint and causes a small dip in observed brightness. It is a Neptune-like planet, a size class that reaches four times Earth's radius. Its radius is 3.08 Earth radii, which is larger than Earth's, and its mass is 10.3 Earth masses, which is also larger than Earth's. The planet's mean density is 1.94 g/cm³, 0.353 times Earth's. It completes an orbit every 15.6 days.

Provenance

Underlying measurements and references

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Evidence Summary

Rows

3

Stellar refs

3

System refs

1

Distancestable

3 values • 1 distinct

Parallaxstable

3 values • 1 distinct

Temperaturedisputed

3 values • 2 distinct

Massdisputed

2 values • 2 distinct

Radiusdisputed

3 values • 2 distinct

Agestable

1 values • 1 distinct

Luminositydisputed

2 values • 2 distinct

Surface Gravitydisputed

3 values • 2 distinct

Metallicitystable

1 values • 1 distinct

Spectral Typestable

1 values • 1 distinct

ST TEFFST MASSST RADST AGEST LUMST SPECTYPESY DISTStellar RefSystem Ref
57700.971.439.700.31G2 IV-V80.75Naponiello et al. 2025TICv8
58091.041.38—0.29—80.75TICv8TICv8
5809—1.38———80.75ExoFOPTICv8