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Zeta Coronae Australis — Star in Corona Australis

Magnitude 4.8m Star Corona Australis (CrA) Visible
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1Physical Properties

Magnitude 4.75
Spectral Type B9.5V
Star Color Blue-white (B-V -0.02)
Distance 105 ly

2Position & Identifiers

RA 19h 03m 06.9s
Dec -42° 05' 43.0"
Constellation Corona Australis (CrA)
HR 7188
HIP 93542
HD 176638
SAO 229461
Bayer Zeta
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

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.

NGC 6768
Hard+
Elliptical galaxy
Galaxy mag 12.85 3.2° Corona Australis
Arkab Prior
HIP 95241; Beta1 Sagittarii
Easy
Easy double, sep 28.3″
Double Star mag 4.01 4.3° Sagittarius
C68
NGC 6729
Hard+
Diffuse nebula
Diffuse Nebula mag 10.0 5.1° Corona Australis
NGC 6723
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 7.3 5.5° Sagittarius
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