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Epsilon Scuti — Star in Scutum

Magnitude 4.9m Star Scutum (Sct) Visible
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1Physical Properties

Magnitude 4.90
Spectral Type G8IIb supergiant
Star Color Orange (B-V 1.12)
Distance 204 ly

2Position & Identifiers

RA 18h 43m 31.3s
Dec -08° 16' 31.0"
Constellation Scutum (Sct)
HR 7032
HIP 91845
HD 173009
SAO 142546
Bayer Epsilon
Double Cat 11601
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium+ Medium 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 May – Jul (peak: Jun)

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

Also classified G5III.
15

Light Travel Time Machine

16

Relativistic Travel

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.

M26
NGC 6694
Easy
Open cluster
Open Cluster mag 8.0 1.2° Scutum
S Sct
Medium
Semi-regular variable, range 6.6–7.3
Variable Star mag 6.80 1.7° Scutum
NGC 6712
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 8.2 2.4° Scutum
IC 1287
Medium+
Reflection nebula around a bright star
Reflection Nebula mag 6.10 3.9° Scutum
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