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Nu Coronae Borealis — Star in Corona Borealis

HIP 80214; Nu Coronae Borealis; 21 Coronae Borealis

Magnitude 5.4m Star Corona Borealis (CrB) Visible
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1Physical Properties

Magnitude 5.39
Spectral Type K5III giant
Star Color Red (B-V 1.53)
Distance 155 ly

2Position & Identifiers

RA 16h 22m 29.2s
Dec +33° 42' 13.0"
Constellation Corona Borealis (CrB)
HR 6108
HIP 80214
HD 147767
SAO 65259
Bayer Nu
Flamsteed 21 CrB
SIMBAD Wikipedia

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 Apr – Jun (peak: May)

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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14

Light Travel Time Machine

15

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.

Sigma CrB
HIP 79607; Sigma Coronae Borealis; 17 Coronae Borealis
Easy
Easy double, sep 7.4″
Double Star mag 5.64 1.6° Corona Borealis
M13
Great Hercules Cluster
Easy
Large bright globular cluster
Globular Cluster mag 5.8 4.8° Hercules
NGC 6207
Medium
Bright spiral galaxy
Galaxy mag 11.6 5.2° Hercules
30 Her
Easy
Mira-type variable, range 4.3–6.3
Variable Star mag 5.04 8.3° Hercules
Show on Map

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