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12 Vulpeculae — Star in Vulpecula

Magnitude 4.8–5.0m Star Vulpecula (Vul) Visible
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1Physical Properties

Magnitude 4.95
Range 4.78 - 4.97
Variable Type BE
Spectral Type B2.5Ve
Star Color Blue (B-V -0.14)

2Position & Identifiers

RA 19h 51m 04.1s
Dec +22° 36' 36.0"
Constellation Vulpecula (Vul)
HR 7565
HIP 97679
HD 187811
SAO 87813
Flamsteed 12 Vul
Variable ID Var
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. at 0.58 micrometers about 0.11m. H line widths vary in cycle about 15 yrs.
3.7d.
Member of the local association (Pleiades group).

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 6830
Easy
Open cluster
Open Cluster mag 7.9 0.5° Vulpecula
13 Vul
Hard
Tight double — a rewarding split at 1.5″
Double Star mag 4.58 1.6° Vulpecula
M27
NGC 6853
Easy
Planetary nebula — try an OIII filter
Planetary Nebula mag 8.1 2.0° Vulpecula
Gamma Sge
Easy
Cool red giant
Star mag 3.47 3.6° Sagitta
M71
Angelfish Cluster
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 8.2 3.9° Sagitta
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