Temperature
3742 K
3550 to 3979.4
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Stellar HostProfile
Kapteyn
Unclassified star • 3.93 pc
Records
10
literature rows
Planets
1
system count
References
11
distinct source labels
TIC: TIC 200385493HIP: HIP 24186HD: HD 33793
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: TICv8 • System source: TICv8
Mass
0.28 Msun
0.28 to 0.32
Radius
0.30 Rsun
0.25 to 0.30
Luminosity
-1.79 log(Lsun)
-2 to -1.79
Distance
3.93 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.30 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
Kapteyn
0.30 R☉
System Layout
Known planets
1 planets linked to this host
Kapteyn c
Radial Velocity
◌
Discovery
2014
Period
121.5 days
Radius
—
Mass
7 M⊕
Eq. Temp
—
Kapteyn: A Nearby Red Dwarf and Its Known Planet
Kapteyn is an M0 V star, a small, cool red dwarf, located 12.8 light-years away. Its measured mass is 0.279 solar masses and its radius is 0.302 solar radii, both smaller than the Sun's. The star's temperature is 3740 K, cooler than the Sun's.
One planet orbits Kapteyn. Kapteyn c was discovered in 2014 using the radial velocity method, which tracks the wobble a planet's gravity induces in its star's motion; repeated wobbles reveal the planet and its orbital period. Kapteyn c has a minimum mass of 7 Earth masses, larger than Earth's, and an orbital period of 122 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
10
Stellar refs
10
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitystable
Metallicitystable
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3550 | 0.28 | 0.29 | — | — | — | 3.93 | Anglada-Escudé et al. 2014 | TICv8 |
| — | — | — | — | — | M0 V | 3.93 | Michigan Catalog, Vol. 2 | TICv8 |
| — | — | — | — | — | K2 | 3.93 | Cannon & Pickering 1918 | TICv8 |
| — | — | — | — | — | M1.0 | 3.93 | Hawley et al. 1996 | TICv8 |
| — | — | — | — | — | — | 3.93 | Nidever et al. 2002 | TICv8 |
| — | — | — | — | — | — | 3.93 | Nordstrom et al. 2004 | TICv8 |
| 3742 | 0.28 | 0.30 | — | -1.79 | — | 3.93 | TICv8 | TICv8 |
| — | — | — | — | — | — | 3.93 | Wright et al. 2004 | TICv8 |
| 3819 | 0.32 | 0.25 | — | -2 | M2.0V | 3.93 | Turnbull 2015 | TICv8 |
| 3979.4 | — | — | — | — | — | 3.93 | Gaia DR2 | TICv8 |