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Eta Trianguli Australis — Star in Triangulum Australe

Magnitude 5.9m Star Triangulum Australe (TrA) Visible
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1Physical Properties

Magnitude 5.91
Spectral Type B7IVe supergiant
Star Color Blue-white (B-V -0.08)

2Position & Identifiers

RA 16h 41m 23.3s
Dec -68° 17' 46.0"
Constellation Triangulum Australe (TrA)
HR 6172
HIP 81710
HD 149671
SAO 253649
Bayer Eta1
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Hard+ Hard V. 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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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

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.

Atria
HIP 82273; Alpha Trianguli Australis
Easy
Bright naked-eye star, mag 1.9
Star mag 1.92 1.0° Triangulum Australe
C107
NGC 6101
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 9.3 4.1° Apus
NGC 6392
Hard+
Bright spiral galaxy
Galaxy mag 12.27 5.7° Apus
S TrA
Medium
Pulsating variable, period 6.3d
Variable Star mag 6.41 6.1° Triangulum Australe
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