66 Eri
Observable Variable Star
Excellent (60/100)
Range: 5.1 - 5.6, Period: 2.0d
HIP 23794; 66 Eri
VariableStar
Eri
Visible
Level 2
Small telescope (4") - Monitor brightness changes
Physical Properties
Magnitude
5.12
Spectral Type
B9V+A1V
Star Color
Blue-white
(B-V -0.06)
Distance
135.9 ly
Position & Identifiers
RA
05h 06m 45.7s
Dec
-04° 39' 18.0"
Constellation
Eri
HR
1657
HIP
23794
Flamsteed
66 Eri
Double Cat
3698
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Visibility
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Comparison Stars for 66 Eri (5.1–5.6)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Separation
1.6″
Companion Mag
9.4
Companion Sp
A1V
Position Angle
233°
Star Colors
A: Blue-white
B: White
Discoverer
HUB 5
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 1.6″ · PA: 233° · 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
E? 5.1 - 5.6v. About 2d.
B9.5, B9.5, 5.5227d, K 103.8k/s, V0 +32.6k/s, msin3i 2.38, asini 7.85. Nearly equal components; secondary is | the more massive, a mercury star. vsini of both components =<41k/s.
Survey Image
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