Temperature
4847.4 K
4847 to 4921.2
←Back to Stellar Hosts
Stellar HostProfile
8 UMi
K0 • 162.6 pc
Records
6
literature rows
Planets
1
system count
References
7
distinct source labels
HD: HD 133086HIP: HIP 73136TIC: TIC 257005016
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: Lee et al. 2015 • System source: TICv8
Mass
1.80 Msun
1.44 to 1.80
Radius
9.90 Rsun
9.90 to 10.73
Age
1.70 Gyr
single adopted value
Distance
162.6 pc
single adopted value
Spectral Type
K0
Consistent across records
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 9.90 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
8 UMi
9.90 R☉
System Layout
Known planets
1 planets linked to this host
8 UMi b
Radial Velocity
◌
Discovery
2015
Period
93.31 days
Radius
—
Mass
524.4 M⊕
Eq. Temp
—
8 UMi and Its Planet
8 UMi is a K0 star 530 light-years away with one known planet. The star is 1.7 billion years old, has a mass of 1.8 solar masses, and a radius of 9.9 solar radii. Its temperature of 4850 K is cooler than the Sun's, and both its mass and radius estimates are larger than the Sun's.
The planet, 8 UMi b, was discovered in 2015 using the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion. It has a minimum mass of 524 Earth masses and an orbital period of 93.3 days. That minimum mass is larger than Earth's and roughly 1.65 times Jupiter's mass.
Provenance
Underlying measurements and references
Evidence Summary
Rows
6
Stellar refs
6
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitystable
Metallicitystable
Spectral Typestable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 4921.2 | — | 10.03 | — | 1.73 | — | 162.6 | Gaia DR2 | TICv8 |
| 4847 | 1.51 | 10.73 | — | 1.72 | — | 162.6 | Hon et al. 2023 | TICv8 |
| 4906 | — | 10.15 | — | — | — | 162.6 | TICv8 | TICv8 |
| — | — | — | — | — | K0 | 162.6 | Cannon & Pickering 1918 | TICv8 |
| 4847.4 | 1.80 | 9.90 | 1.70 | — | K0 | 162.6 | Lee et al. 2015 | TICv8 |
| 4847 | 1.44 | 10.30 | — | — | — | 162.6 | Stassun et al. 2017 | TICv8 |