54 Eri
HIP 21763; 54 Eri
DoubleStar
Eri
Visible
Level 6
Professional/Research - Requires steady seeing
Physical Properties
Magnitude
4.32
Range
4.28 - 4.38
Period
30.000 days
Variable Type
Semi-Regular Variable (Late-type Giant)
Spectral Type
M4III
Star Color
Red
(B-V 1.61)
Distance
407.7 ly
Position & Identifiers
RA
04h 40m 26.5s
Dec
-19° 40' 18.0"
Constellation
Eri
HR
1496
HIP
21763
Flamsteed
54 Eri
Variable ID
DM Eri
Double Cat
3380
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Visibility
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Light Curve
Multiple Star System
Separation
0.1″
Companion Mag
5.4
Position Angle
135°
Star Colors
A: Red
Discoverer
STN 9
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.1″ · PA: 135° · N up, E left
Unresolved · 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
SRb 4.28 - 4.36V, 30d.
Seen as double only in 1877 and 1923.
Survey Image
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