Temperature
3793 K
3512 to 3793
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Stellar HostProfile
TOI-4666
M2±0.5 • 154.7 pc
Records
4
literature rows
Planets
1
system count
References
5
distinct source labels
TIC: TIC 165202476
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: Dransfield et al. 2026 • System source: TICv8
Mass
0.58 Msun
0.58 to 0.58
Radius
0.58 Rsun
0.58 to 0.59
Age
3 Gyr
single adopted value
Luminosity
-1.20 log(Lsun)
-1.25 to -1.20
Distance
154.7 pc
single adopted value
Spectral Type
M2±0.5
Multiple classifications reported
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.58 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
TOI-4666
0.58 R☉
System Layout
Known planets
1 planets linked to this host
TOI-4666 b
Transit
◌
Discovery
2025
Period
2.91 days
Radius
12.53 R⊕
Mass
155.4 M⊕
Eq. Temp
695 K
TOI-4666 b: A Jupiter-like Planet
TOI-4666 is an M2±0.5 star located 505 light-years away. This small, cool red dwarf has a mass of 0.576 solar masses, a radius of 0.585 solar radii, and a temperature of 3790 K. It is 3 billion years old. The star's reported mass and radius estimates are smaller than the Sun's, and its reported temperature is cooler than the Sun's.
One planet orbits TOI-4666: TOI-4666 b, a Jupiter-like world discovered by the transit method in 2025. With a radius of 12.5 Earth radii, it exceeds the Jupiter-like threshold of four Earth radii, and its reported radius estimate is larger than Earth's. The planet's orbital period is 2.91 days. Its mass is 155 Earth masses, larger than Earth's, and the planet's mean density is 0.435 g/cm³, which is 0.079 times Earth's.
Provenance
Underlying measurements and references
Evidence Summary
Rows
4
Stellar refs
4
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3512 | 0.58 | 0.59 | — | -1.22 | M2.5 V | 154.7 | Frensch et al. 2026 | TICv8 |
| 3666 | 0.58 | 0.59 | — | -1.25 | — | 154.7 | TICv8 | TICv8 |
| 3666 | — | 0.59 | — | — | — | 154.7 | ExoFOP | TICv8 |
| 3793 | 0.58 | 0.58 | 3 | -1.20 | M2±0.5 | 154.7 | Dransfield et al. 2026 | TICv8 |