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41 Cygni — Star in Cygnus

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

Magnitude 4.01
Spectral Type F5II bright giant
Star Color Yellow-white (B-V 0.40)
Distance 233 ly

2Position & Identifiers

RA 20h 29m 23.7s
Dec +30° 22' 07.0"
Constellation Cygnus (Cyg)
HR 7834
HIP 101076
HD 195295
SAO 70095
Flamsteed 41 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 Jun – Aug (peak: Jul)

5Survey Image

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7

Size Comparison

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8

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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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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.

NGC 6940
Easy
Rich open cluster
Open Cluster mag 6.3 2.4° Vulpecula
49 Cyg
Medium+
Tight double — a rewarding split at 2.8″
Double Star mag 5.51 3.2° Cygnus
T Vul
Medium
Pulsating variable, period 4.4d
Variable Star mag 5.77 5.3° Vulpecula
East Veil Nebula
NGC 6992
Medium+
Supernova remnant
Supernova Remnant mag 7.0 5.9° Cygnus
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