Epsilon Circini — Star in Circinus
Observe
1Physical Properties
Magnitude
4.86
Spectral Type
K2.5III
giant
Star Color
Red
(B-V 1.25)
Distance
815 ly
2Position & Identifiers
RA
15h 17m 38.9s
Dec
-63° 36' 38.0"
Constellation
Circinus
(Cir)
HR
5666
HIP
74837
HD
135291
SAO
253088
Bayer
Epsilon
Querying VizieR catalog...
3How easy to spot?
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Medium+ | Medium | Hard+ |
| 50 mm finder 50mm finder | Easy | Easy | Easy |
| 150 mm telescope 150mm scope | Easy | Easy | Easy |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
Set a location in User Settings to see visibility data.
Best season
Apr – Jun
(peak: May)
5Survey Image
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Explore
6
Size Comparison
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7
Compare Stars
8
Spectral Classification
9
Hertzsprung-Russell Diagram
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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
Discover
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.
Delta Cir
Hot blue O-type star
Star
mag 5.09
2.7°
Circinus
AX Cir
Pulsating variable, period 5.3d
Variable Star
mag 5.87
2.8°
Circinus
NGC 5938
Barred spiral galaxy
Galaxy
mag 11.49
3.8°
Triangulum Australe
C95
NGC 6025
Rich open cluster
Open Cluster
mag 5.1
6.1°
Triangulum Australe
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Mythology, bright stars, and deep-sky highlights.
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The Hertzsprung-Russell Diagram — Reading Stars Like a Map
The HR diagram turns the night sky into a physics map: every named star has a spot, every spot tells you mass, age, and fate. A guide for amateur observers.
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