Upsilon Eri
HIP 20042; Upsilon4 Eri; 41 Eri
HIP 20042; Upsilon4 Eri; 41 Eri
DoubleStar
Eri
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
3.56
Spectral Type
B6V
Star Color
Blue-white
(B-V -0.12)
Distance
177.9 ly
Position & Identifiers
RA
04h 17m 53.7s
Dec
-33° 47' 54.0"
Constellation
Eri
HR
1347
HIP
20042
Bayer
Upsilon4
Flamsteed
41 Eri
Variable ID
Var
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
5.5″
Companion Mag
9.9
Position Angle
163°
Star Colors
A: Blue-white
B: White
Discoverer
HUB 3
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 5.5″ · PA: 163° · 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
Small amp., possible periods 0.96, 1.93, 8.5, 0.89d, with 8.5 slightly favored (Manfroid and Mathys 1985, A&AS, | 59, 429).
C, 11.8v at 49".
B8, B9.5 5.0105d, K 63.8k/s, V0 +17.8k/s, msin3i 0.559, asini 4.40. Equal components, equal vsini 12k/s; | rotational velocity 31k/s.
Member of Pleiades group.
HgMn star.
Survey Image
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