Tau Eri
HIP 15474; Tau4 Eri; 16 Eri
HIP 15474; Tau4 Eri; 16 Eri
DoubleStar
Eri
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
3.69
Range
3.57 - 3.78
Period
23.800 days
Variable Type
Semi-Regular Variable (Short Period)
Spectral Type
M3III-IIIa Ca-1
Star Color
Red
(B-V 1.62)
Distance
303.6 ly
Position & Identifiers
RA
03h 19m 31.0s
Dec
-21° 45' 28.0"
Constellation
Eri
HR
1003
HIP
15474
Bayer
Tau4
Flamsteed
16 Eri
Variable ID
Tau4 Eri
Double Cat
2472
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Visibility
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Light Curve
Multiple Star System
Components
6
Component IDs
AB
Separation
5.8″
Companion Mag
9.5
Position Angle
290°
Star Colors
A: Red
Discoverer
JC 1
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 5.8″ · PA: 290° · N up, E left
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
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 Notes
Lb? 3.57 - 3.72V.
AB binary, B is K0V. C, 11v at 40" optical.
Hyades group.
Ultraviolet FeII emission.
0.010".
Survey Image
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