Temperature
3348 K
3348 to 3708
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Stellar HostProfile
G 9-40
M2.5 V • 27.93 pc
Records
6
literature rows
Planets
1
system count
References
7
distinct source labels
TIC: TIC 203214081
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: Stefansson et al. 2020 • System source: TICv8
Mass
0.29 Msun
0.29 to 0.30
Radius
0.31 Rsun
0.30 to 0.32
Age
9.90 Gyr
single adopted value
Luminosity
-1.97 log(Lsun)
-1.97 to -1.91
Distance
27.93 pc
single adopted value
Spectral Type
M2.5 V
Consistent across records
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.31 R☉ • circles scaled linearly by radius
Sun
1.0 R☉ baseline
G 9-40
0.31 R☉
System Layout
Known planets
1 planets linked to this host
G 9-40 b
Transit
◌
Discovery
2019
Period
5.75 days
Radius
1.90 R⊕
Mass
4 M⊕
Eq. Temp
440.6 K
G 9-40: A Nearby Red Dwarf and Its Super-Earth
G 9-40 is an M2.5 V star, a small, cool red dwarf with one known planet. It lies 91.1 light-years away and is 9.9 billion years old. Its mass is 0.29 solar masses and its radius is 0.307 solar radii, both smaller than the Sun's. Its temperature of 3350 K is cooler than the Sun's.
The planet, G 9-40 b, was discovered in 2019 by the transit method, in which a planet passing in front of its star causes a small dip in observed brightness. It is classified as a Super-Earth. Its radius is 1.9 Earth radii, larger than Earth's, and its mass is 4 Earth masses, also larger than Earth's. Its mean density is 3.21 g/cm³, 0.583 times Earth's. G 9-40 b completes an orbit around its star every 5.75 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
6
Stellar refs
6
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typestable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3413 | — | 0.32 | — | — | — | 27.93 | ExoFOP | TICv8 |
| 3395 | 0.30 | 0.30 | — | -1.96 | — | 27.93 | Luque et al. 2022 | TICv8 |
| 3413 | 0.29 | 0.32 | — | -1.91 | — | 27.93 | TICv8 | TICv8 |
| 3390 | — | 0.31 | — | — | — | 27.93 | Yu et al. 2018 | TICv8 |
| 3348 | 0.29 | 0.31 | 9.90 | -1.97 | M2.5 V | 27.93 | Stefansson et al. 2020 | TICv8 |
| 3708 | — | — | — | — | — | 27.93 | Gaia DR2 | TICv8 |