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15 Vulpeculae — Star in Vulpecula

Magnitude 4.6m Star Vulpecula (Vul) Visible
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1Physical Properties

Magnitude 4.64
Range 4.62 - 4.67
Period 14.0 days
Variable Type Alpha2 CVn (Magnetic Rotating)
Spectral Type A4III giant
Star Color Yellow-white (B-V 0.18)
Distance 109 ly

2Position & Identifiers

RA 20h 01m 06.1s
Dec +27° 45' 13.0"
Constellation Vulpecula (Vul)
HR 7653
HIP 98543
HD 189849
SAO 88071
Flamsteed 15 Vul
Variable ID NT Vul
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium+ Medium 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

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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

Amp. 0.03V, 14.0d.
3195d, K 4.6k/s, V0 -24.0k/s, e 0.76. Unresolved by speckle interferometry.
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 6834
Easy
Open cluster
Open Cluster mag 7.8 2.6° Cygnus
SU Cyg
Medium+
Pulsating variable, period 3.8d
Variable Star mag 6.82 3.9° Cygnus
M27
Dumbbell Nebula
Easy
Planetary nebula — try an OIII filter
Planetary Nebula mag 7.4 5.0° Vulpecula
Show on Map

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