Temperature
4504 K
4504 to 4621.8
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Stellar HostProfile
alf Ari
K2III • 20.21 pc
Records
9
literature rows
Planets
1
system count
References
9
distinct source labels
TIC: TIC 306349516HIP: HIP 9884HD: HD 12929
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: Turnbull 2015 • System source: TICv8
Mass
3.13 Msun
1.33 to 3.13
Radius
15.21 Rsun
13.90 to 15.21
Luminosity
1.93 log(Lsun)
single adopted value
Distance
20.21 pc
single adopted value
Spectral Type
K2III
Multiple classifications reported
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 15.21 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
alf Ari
15.21 R☉
System Layout
Known planets
1 planets linked to this host
alf Ari b
Radial Velocity
◌
Discovery
2010
Period
380.8 days
Radius
—
Mass
572.1 M⊕
Eq. Temp
—
Alf Ari: A Cool Giant Star and Its One Known Planet
Alf Ari is a star located 65.9 light-years from Earth. It is a K2III star, and its measured properties place it well above the Sun in both mass and size. Its mass is 3.13 solar masses, and its radius is 15.2 solar radii. Its temperature is 4500 K, making it cooler than the Sun.
One planet orbits Alf Ari. Named alf Ari b, it was discovered in 2010 using the radial velocity method, which detects the gravitational wobble a planet induces in its host star's motion. The planet's minimum mass is 572 Earth masses, a lower bound on its true mass, and it is roughly 1.8 times Jupiter's mass. Its orbital period is 381 days.
Provenance
Underlying measurements and references
Evidence Summary
Rows
9
Stellar refs
8
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositystable
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 4513 | 1.33 | — | — | — | — | 20.21 | Mortier et al. 2013 | TICv8 |
| — | — | — | — | — | K1 IIIb | 20.21 | Gray et al. 2003 | TICv8 |
| — | — | — | — | — | K2 | 20.21 | Cannon & Pickering 1918 | TICv8 |
| — | — | — | — | — | K2 IIIab | 20.21 | Garrison & Beattie 1998 | TICv8 |
| 4504 | 3.13 | 15.21 | — | 1.93 | K2III | 20.21 | Turnbull 2015 | TICv8 |
| — | — | — | — | — | — | 20.21 | Duncan et al. 1991 | TICv8 |
| 4621.8 | — | — | — | — | — | 20.21 | TICv8 | TICv8 |
| — | — | — | — | — | — | 20.21 | Duncan et al. 1991 | TICv8 |
| 4553 | 1.50 | 13.90 | — | — | — | 20.21 | Lee et al. 2011 | TICv8 |