Stellar HostProfile

alf Tau

K5 III • 20.43 pc

Records

literature rows

Planets

system count

References

distinct source labels

HIP: HIP 21421TIC: TIC 245873777HD: HD 29139

Approximate color

from effective temperature

Stellar source: Hatzes et al. 2015 • System source: TICv8

Temperature

4055 K

3889 to 4055

3 values • 3 distinct

Mass

1.13 Msun

1.13 to 4.84

2 values • 2 distinct

Radius

45.10 Rsun

45.10 to 47.70

2 values • 2 distinct

Age

6.60 Gyr

single adopted value

1 values • 1 distinct

Distance

20.43 pc

single adopted value

7 values • 1 distinct

Spectral Type

K5 III

Multiple classifications reported

K5 III (4), K5 (1), K5III (1)

Planets

Stable across source rows

Sun

1.0 R☉ baseline

alf Tau

45.10 R☉

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.

Evidence Summary

Rows

Stellar refs

System refs

Distancestable

7 values • 1 distinct

Parallaxstable

7 values • 1 distinct

Temperaturedisputed

3 values • 3 distinct

Massdisputed

2 values • 2 distinct

Radiusdisputed

2 values • 2 distinct

Agestable

1 values • 1 distinct

Luminositystable

1 values • 1 distinct

Surface Gravitystable

1 values • 1 distinct

Metallicitydisputed

2 values • 2 distinct

Spectral Typedisputed

6 values • 3 distinct

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

alf Tau

Adopted host values from one source row

Radius against the Sun

Known planets

alf Tau b

Alf Tau and Its Giant Planet

Underlying measurements and references