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Zeta Cygni — Star in Cygnus

Magnitude 3.2m Star Cygnus (Cyg) Visible
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1Physical Properties

Magnitude 3.20
Spectral Type G8+ IIIa Ba0.5
Star Color Orange (B-V 0.99)
Distance 143 ly

2Position & Identifiers

RA 21h 12m 56.2s
Dec +30° 13' 37.0"
Constellation Cygnus (Cyg)
HR 8115
HIP 104732
HD 202109
SAO 71070
Bayer Zeta
Flamsteed 64 Cyg
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Easy Easy 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

Discover

15Stellar Notes

White dwarf companion.
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.

V389 Cyg
Easy
Easy double, sep 3.3″
Double Star mag 5.59 0.9° Cygnus
DT Cyg
Hard+
Pulsating variable, period 2.5d
Variable Star mag 5.82 1.7° Cygnus
NGC 7013
Hard+
Bright spiral galaxy
Galaxy mag 12.0 2.1° Cygnus
Network nebula
NGC 6995
Medium+
Supernova remnant
Supernova Remnant mag 7.00 3.5° Cygnus
Show on Map

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