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21 Vulpeculae — Star in Vulpecula

Magnitude 5.2m Star Vulpecula (Vul) Visible
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1Physical Properties

Magnitude 5.18
Variable Type Delta Scuti (Pulsating)
Spectral Type A7IVn supergiant
Star Color Yellow-white (B-V 0.18)
Distance 326 ly

2Position & Identifiers

RA 20h 14m 14.5s
Dec +28° 41' 41.0"
Constellation Vulpecula (Vul)
HR 7731
HIP 99738
HD 192518
SAO 88391
Flamsteed 21 Vul
Variable ID NU Vul
SIMBAD

3How easy to spot?

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

5Survey Image

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6

Size Comparison

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7

Compare Stars

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

Delta Sct, 16.478d, amp. 0.07V.
Shell star.
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.

C37
NGC 6885
Easy
Open cluster
Open Cluster mag 6.0 2.3° Vulpecula
22 Vul
Easy
Observable variable star
Variable Star mag 5.15 5.2° Vulpecula
M27
Dumbbell Nebula
Easy
Planetary nebula — try an OIII filter
Planetary Nebula mag 7.4 6.8° Vulpecula
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