Temperature
3844 K
3835 to 4126.7
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Stellar HostProfile
K2-3
M V • 44.07 pc
Records
20
literature rows
Planets
3
system count
References
19
distinct source labels
TIC: TIC 173103335
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: Diamond-Lowe et al. 2022 • System source: TICv8
Mass
0.55 Msun
0.41 to 0.62
Radius
0.55 Rsun
0.37 to 0.60
Age
6.90 Gyr
1 to 6.90
Luminosity
-1.23 log(Lsun)
-1.23 to -1.15
Distance
44.07 pc
single adopted value
Spectral Type
M V
Multiple classifications reported
Planets
3
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.55 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-3
0.55 R☉
System Layout
Known planets
3 planets linked to this host
K2-3: A Cool Red Dwarf and Its Three Transiting Planets
K2-3 is an M V star, a small, cool red dwarf, located 144 light-years away. It hosts three known planets. The star is estimated to be 6.9 billion years old, with a mass of 0.549 solar masses, a radius of 0.546 solar radii, and a temperature of 3840 K. Its reported mass and radius estimates are smaller than the Sun's, and its temperature is cooler than the Sun's.
All three planets were discovered by transit in 2015, the method in which a planet passing in front of its star causes a small dip in observed brightness. K2-3 b is classified as a Super-Earth, with a mass of 5.11 Earth masses, a radius of 2.08 Earth radii, and an orbital period of 10.1 days. K2-3 c is also a Super-Earth, with a mass of 2.68 Earth masses, a radius of 1.58 Earth radii, and an orbital period of 24.6 days. K2-3 d is classified as Earth-like, with a reported upper limit of 2.2 Earth masses, a radius of 1.46 Earth radii, and an orbital period of 44.6 days. Among the listed planets, K2-3 b has the shortest year, K2-3 c the second-shortest, and K2-3 d the longest, by reported estimates.
K2-3 b's radius and mass estimates are larger than Earth's, and its mean density is 3.14 g/cm³, 0.569 times Earth's. K2-3 c's radius and mass estimates are also larger than Earth's, with a mean density of 3.73 g/cm³, 0.677 times Earth's. K2-3 d's radius estimate is larger than Earth's. Among the listed planets, K2-3 d has the smallest radius, K2-3 c the second-smallest, and K2-3 b the largest, by reported estimates.
Provenance
Underlying measurements and references
Evidence Summary
Rows
20
Stellar refs
18
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agedisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3896 | 0.60 | 0.56 | — | — | — | 44.07 | Howard et al. 2025 | TICv8 |
| 3844 | 0.55 | 0.55 | 6.90 | -1.23 | M V | 44.07 | Diamond-Lowe et al. 2022 | TICv8 |
| — | — | — | — | — | — | 44.07 | Barros et al. 2016 | TICv8 |
| — | — | 0.56 | — | — | M0 V | 44.07 | Beichman et al. 2016 | TICv8 |
| — | — | 0.37 | — | — | — | 44.07 | Kruse et al. 2019 | TICv8 |
| 3951 | 0.53 | 0.52 | — | — | — | 44.07 | Montet et al. 2015 | TICv8 |
| 3927 | — | 0.58 | — | — | — | 44.07 | Vanderburg et al. 2016 | TICv8 |
| 3896 | 0.60 | 0.56 | 1 | — | M0.0 V | 44.07 | Crossfield et al. 2015 | TICv8 |
| — | 0.61 | 0.55 | — | — | — | 44.07 | Almenara et al. 2015 | TICv8 |
| 3841 | 0.41 | 0.37 | — | — | — | 44.07 | Crossfield et al. 2016 | TICv8 |
| 3835 | 0.62 | 0.60 | 1 | -1.15 | — | 44.07 | Damasso et al. 2018 | TICv8 |
| — | — | 0.37 | — | — | — | 44.07 | Kruse et al. 2019 | TICv8 |
| 3920 | — | 0.55 | — | — | — | 44.07 | ExoFOP | TICv8 |
| 3896 | 0.60 | 0.56 | — | — | — | 44.07 | Dai et al. 2016 | TICv8 |
| 3896 | 0.60 | 0.56 | 1 | — | M0.0±0.5 V | 44.07 | Kosiarek et al. 2019 | TICv8 |
| 3835 | 0.62 | 0.60 | 1 | — | — | 44.07 | Bonomo et al. 2023 | TICv8 |
| 3896 | 0.60 | 0.56 | — | — | M0 V | 44.07 | Sinukoff et al. 2016 | TICv8 |
| — | — | 0.37 | — | — | — | 44.07 | Kruse et al. 2019 | TICv8 |
| 3920 | 0.55 | 0.55 | — | -1.19 | — | 44.07 | TICv8 | TICv8 |
| 4126.7 | — | — | — | — | — | 44.07 | Gaia DR2 | TICv8 |