Temperature
4055 K
3889 to 4055
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Stellar HostProfile
alf Tau
K5 III • 20.43 pc
Records
7
literature rows
Planets
1
system count
References
8
distinct source labels
HIP: HIP 21421TIC: TIC 245873777HD: HD 29139
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: Hatzes et al. 2015 • System source: TICv8
Mass
1.13 Msun
1.13 to 4.84
Radius
45.10 Rsun
45.10 to 47.70
Age
6.60 Gyr
single adopted value
Distance
20.43 pc
single adopted value
Spectral Type
K5 III
Multiple classifications reported
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 45.10 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
alf Tau
45.10 R☉
System Layout
Known planets
1 planets linked to this host
alf Tau b
Radial Velocity
◌
Discovery
2015
Period
629.0 days
Radius
—
Mass
2056.4 M⊕
Eq. Temp
—
Alf Tau and Its Giant Planet
Alf Tau is a K-type giant star 66.6 light-years away. Its spectral type is K5 III, and it is cooler than the Sun at 4060 K. The star's reported mass estimate is larger than the Sun's at 1.13 solar masses, and its reported radius estimate is larger than the Sun's at 45.1 solar radii. Its age is 6.6 billion years. This host has one known planet.
That planet is alf Tau b, discovered in 2015 by the radial velocity method. Its minimum mass is 2060 Earth masses, larger than Earth's and roughly 6.47 times Jupiter's mass. It orbits alf Tau every 629 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
7
Stellar refs
7
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositystable
Surface Gravitystable
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3889 | 4.84 | 47.70 | — | 2.67 | K5III | 20.43 | Turnbull 2015 | TICv8 |
| 3902.6 | — | — | — | — | — | 20.43 | TICv8 | TICv8 |
| — | — | — | — | — | K5 III | 20.43 | Gray et al. 2003 | TICv8 |
| — | — | — | — | — | K5 III | 20.43 | Gray et al. 2006 | TICv8 |
| — | — | — | — | — | K5 | 20.43 | Cannon & Pickering 1918 | TICv8 |
| 4055 | 1.13 | 45.10 | 6.60 | — | K5 III | 20.43 | Hatzes et al. 2015 | TICv8 |
| — | — | — | — | — | K5 III | 20.43 | Garrison & Beattie 1998 | TICv8 |