Temperature
3410 K
2890 to 3881.1
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Stellar HostProfile
K2-33
M3 • 139.3 pc
Records
8
literature rows
Planets
1
system count
References
9
distinct source labels
TIC: TIC 49040478
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: David et al. 2016 • System source: TICv8
Mass
0.31 Msun
0.31 to 0.57
Radius
1.10 Rsun
0.16 to 1.10
Age
7.50e-3 Gyr
7.50e-3 to 9.30e-3
Luminosity
-0.83 log(Lsun)
-1.24 to -0.82
Distance
139.3 pc
single adopted value
Spectral Type
M3
Multiple classifications reported
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 1.10 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
K2-33
1.10 R☉
System Layout
Known planets
1 planets linked to this host
K2-33 b
Transit
◌
Discovery
2016
Period
5.42 days
Radius
5.04 R⊕
Mass
1176.0 M⊕
Eq. Temp
—
K2-33: A Very Young Star With One Known Planet
K2-33 is an M3 star located 454 light-years away. Its spectral class indicates a small, cool red dwarf, and at 0.0075 billion years old it is a very young star. It has 0.31 solar masses, 1.1 solar radii, and a temperature of 3410 K, making its reported mass estimate smaller than the Sun's and its reported temperature cooler than the Sun's. One planet orbits this star.
That planet is K2-33 b, discovered by transit in 2016 and classified as Jupiter-like. It has a radius of 5.04 Earth radii, larger than Earth's, and a reported upper limit of 1175.971 Earth masses. Its orbital period is 5.42 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
8
Stellar refs
8
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agedisputed
Luminositydisputed
Surface Gravitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3540 | 0.57 | 1.02 | — | -0.84 | — | 139.3 | Thao et al. 2023 | TICv8 |
| 2890 | — | 0.16 | — | — | — | 139.3 | Vanderburg et al. 2016 | TICv8 |
| — | — | 0.53 | — | — | — | 139.3 | Kruse et al. 2019 | TICv8 |
| — | — | — | — | — | — | 139.3 | Rizzuto et al. 2017 | TICv8 |
| 3881.1 | — | 0.53 | — | -1.24 | — | 139.3 | Gaia DR2 | TICv8 |
| 3410 | 0.31 | 1.10 | 7.50e-3 | -0.83 | M3 | 139.3 | David et al. 2016 | TICv8 |
| 3318 | 0.35 | 0.91 | — | -1.04 | — | 139.3 | TICv8 | TICv8 |
| 3540 | 0.56 | 1.05 | 9.30e-3 | -0.82 | M3.3 | 139.3 | Mann et al. 2016 | TICv8 |