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Epsilon Cephei — Star in Cepheus

Magnitude 4.2m Star Cepheus (Cep) Visible
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1Physical Properties

Magnitude 4.19
Range 4.15 - 4.21
Period 1.0 hours
Variable Type Delta Scuti (Low Amplitude)
Spectral Type F0IV subgiant
Star Color Yellow-white (B-V 0.28)
Distance 80 ly

2Position & Identifiers

RA 22h 15m 02.0s
Dec +57° 02' 37.0"
Constellation Cepheus (Cep)
HR 8494
HIP 109857
HD 211336
SAO 34227
Bayer Epsilon
Flamsteed 23 Cep
Variable ID Eps Cep
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium+ Medium+ Medium
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 Jul – Sep (peak: Aug)

5Survey Image

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7

Size Comparison

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8

Compare Stars

9

Spectral Classification

10

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
11

Stellar Lifecycle

12

Blackbody Spectrum

13

Stellar Absorption Spectrum

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

14

Stellar Fusion

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15Stellar Notes

Delta Sct 4.15 - 4.20V, 0.04242 and 0.068073d. Period and amp. vary.
RV amp. greater than expected for light variation.
16

Light Travel Time Machine

17

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.

NGC 7234
Easy
Open cluster
Open Cluster mag 7.70 0.4° Cepheus
14 Cep
Easy
Hot blue O-type star
Star mag 5.56 2.0° Cepheus
Delta Cep
Medium+
Pulsating variable, period 5.4d
Variable Star mag 3.75 2.3° Cepheus
Lambda Cep
Easy
Hot blue O-type star
Star mag 5.04 2.4° Cepheus
IC 1470
Hard+
Emission nebula — try an OIII filter
Emission Nebula mag 11.50 7.3° Cepheus
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