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Rho Cygni — Star in Cygnus

Magnitude 4.0m Star Cygnus (Cyg) Visible
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1Physical Properties

Magnitude 4.02
Range 3.99 - 4.02
Variable Type RS:
Spectral Type G8IIIFe-0.5 giant
Star Color Orange (B-V 0.89)
Distance 1,631 ly

2Position & Identifiers

RA 21h 33m 58.9s
Dec +45° 35' 31.0"
Constellation Cygnus (Cyg)
HR 8252
HIP 106481
HD 205435
SAO 51035
Bayer Rho
Flamsteed 73 Cyg
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Easy 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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Explore

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

UMa stream.
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.

W Cyg
Easy
Semi-regular variable, range 5.1–6.8
Variable Star mag 5.53 0.4° Cygnus
NGC 7082
Easy
Open cluster
Open Cluster mag 7.2 1.7° Cygnus
68 Cyg
Easy
Hot blue O-type star
Star mag 5.00 3.2° Cygnus
Cocoon Nebula
IC 5146
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 10.0 3.7° Cygnus
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