Ain
HIP 20889; Epsilon Tau; 74 Tau
HIP 20889; Epsilon Tau; 74 Tau
DoubleStar
Taurus
(Tau)
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
3.53
Spectral Type
G9.5III CN0.5
Star Color
Orange
(B-V 1.01)
Distance
147 ly
Position & Identifiers
RA
04h 28m 37.0s
Dec
+19° 10' 49.0"
Constellation
Taurus
(Tau)
HR
1409
HIP
20889
Bayer
Epsilon
Flamsteed
74 Tau
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Visibility
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Multiple Star System
Separation
190.4″
Companion Mag
10.6
Position Angle
269°
Star Colors
A: Orange
Discoverer
BUP 61
Eyepiece View
32x
Dawes: 1.9″
TFOV: 1.6°
Realistic = true angular size
Sep: 190.4″ · PA: 269° · N up, E left
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 2.3″
Size Comparison
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Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
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Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Fusion
Exoplanets
1 known planet
| Planet | Radius | Mass | Period | Distance |
|---|---|---|---|---|
| eps Tau b | 12.70R⊕ | 7.19M♃ | 1.6yr | 155ly |
Habitable Zone
Size & Mass Comparison
Stellar Notes
In Hyades cluster; Mel 25 #70.
Ain; Oculus Boreus.
Light Travel Time Machine
Relativistic Travel
Survey Image
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