51 Eri
HIP 21547; 51 Eri
DoubleStar
Eridanus
(Eri)
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
5.23
Spectral Type
F0V
Star Color
Yellow-white
(B-V 0.28)
Distance
96 ly
Position & Identifiers
RA
04h 37m 36.1s
Dec
-02° 28' 24.0"
Constellation
Eridanus
(Eri)
HR
1474
HIP
21547
Flamsteed
51 Eri
Double Cat
3350
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Visibility
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Multiple Star System B: optical
Components
3
Component IDs
AC
Separation
28.9″
Companion Mag
11.8
Companion Sp
M0.5
Position Angle
75°
Star Colors
A: Yellow-white
B: Red
Discoverer
BU 88
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 28.9″ · PA: 75° · 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 |
|---|---|---|---|---|
| 51 Eri b | — | 10.90M♃ | 24.9yr | 97ly |
Habitable Zone
Size & Mass Comparison
Stellar Notes
IDS gives AB, 5.3, 11.8v sep. 30". Optical. Component C by Wallenquist.
Light Travel Time Machine
Relativistic Travel
Survey Image
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