Epsilon Tauri
Epsilon Tauri (ε Tauri, abbreviated Epsilon Tau, ε Tau), formally named Ain , is an orange giant star located approximately 45 parsecs (147 light-years) from the Sun in the constellation of Taurus. An extrasolar planet (designated Epsilon Tauri b, later named Amateru) is believed to be orbiting the star.

It is a member of the Hyades open cluster. As such its age is well constrained at 625 million years. It is claimed to be the heaviest among planet-harboring stars with reliable initial masses although the star HD 13189 is potentially more massive. Given its large mass, this star, though presently of spectral type K0 III, was formerly of spectral type A that has now evolved off the main sequence into the giant phase. It is regarded as a red clump giant; that is, a core-helium burning star.

Since Epsilon Tauri lies near the plane of the ecliptic, it is sometimes occulted by the Moon and (very rarely) by planets.

It has an 11th magnitude companion 182 arcseconds from the primary.
Q5875
orange giant
Concept
Q523
star
Concept
Q12129
parsec
Concept
Q531
light-year
Concept
Q525
Sun
CEL
Q8928
constellation
Concept
Q10570
Taurus
Concept
Q44559
extrasolar planet
Concept
Q1151862
Epsilon Tauri b
Concept
Q13511
Hyades
DIS
Q11387
open cluster
Concept
Q1193538
HD 13189
CEL
Q25377588
spectral type
Concept
Q3450
main sequence
Concept
Q1358411
red clump giant
Concept
Q79852
ecliptic
Concept
Q202746
occulted
Concept
Q405
Moon
CEL
Q634
planet
Concept
Q12097402
arcsecond
Concept
Q405857
Epsilon Tauri
CEL
Q405857
Epsilon Tauri
CEL
+45^^http://www.w3.org/2001/XMLSchema#decimal
45
NUMBER
+147^^http://www.w3.org/2001/XMLSchema#decimal
147
NUMBER
0^^http://www.w3.org/2001/XMLSchema#decimal
0
NUMBER
+11^^http://www.w3.org/2001/XMLSchema#decimal
11
NUMBER
instance of
constellation
parent astronomical body
subclass of
model item
instance of
instance of
instance of