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DU Eridani — Star in Eridanus

Magnitude 5.6m Star Eridanus (Eri) Visible
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1Physical Properties

Magnitude 5.60
Range 5.33 - 5.90
Variable Type Gamma Cassiopeiae (Eruptive Be Star)
Spectral Type B1Vne
Star Color Blue (B-V -0.23)

2Position & Identifiers

RA 04h 29m 06.9s
Dec -13° 02' 54.0"
Constellation Eridanus (Eri)
HR 1423
HIP 20922
HD 28497
SAO 149674
Variable ID DU Eri
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Hard+ Hard+ Hard
50mm finder Easy Easy Easy
150mm scope Easy Easy Easy
Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

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Best season Oct – Dec (peak: Nov)

5Survey Image

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6

Size Comparison

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7

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8

Spectral Classification

9

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
10

Stellar Lifecycle

11

Blackbody Spectrum

12

Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

13

Stellar Fusion

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14Stellar Notes

Gamma Cas 5.41 - 5.49V. Expanding circumstellar shell; possibly high velocity mass loss. Equivalent width of H alpha | variable.
Lyman beta observed from COPERNICUS. Expanding circumstellar shell.

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

39 Eri
Easy
Easy double, sep 6.7″
Double Star mag 4.87 4.6° Eridanus
R Lep
Hard+
Mira-type variable, range 5.5–11.7
Variable Star mag 7.71 7.6° Lepus
NGC 1725
Hard+
Elliptical galaxy
Galaxy mag 13.0 7.6° Eridanus
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