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Beta Circini — Star in Circinus

Magnitude 4.1m Star Circinus (Cir) Visible
Star Map
+ List + Plan

Observe

1Physical Properties

Magnitude 4.07
Spectral Type A3V
Star Color White (B-V 0.09)
Distance 62 ly

2Position & Identifiers

RA 15h 17m 30.8s
Dec -58° 48' 04.0"
Constellation Circinus (Cir)
HR 5670
HIP 74824
HD 135379
SAO 242384
Bayer Beta
SIMBAD

3How easy to spot?

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

7

Size Comparison

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8

Compare Stars

9

Spectral Classification

10

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
11

Stellar Lifecycle

12

Blackbody Spectrum

13

Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

14

Stellar Fusion

Discover

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.

Delta Cir
Easy
Hot blue O-type star
Star mag 5.09 2.2° Circinus
C88
NGC 5823
Easy
Open cluster
Open Cluster mag 7.9 3.6° Circinus
Rigil Kentaurus
HIP 71681; Alpha2 Centauri
Easy
Easy double, sep 8.1″
Double Star mag 1.33 5.2° Centaurus
AX Cir
Hard+
Pulsating variable, period 5.3d
Variable Star mag 5.87 5.8° Circinus
NGC 5927
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 8.3 8.3° Lupus
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Circinus
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