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Epsilon Librae — Star in Libra

Magnitude 4.9m Star Libra (Lib) Visible
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1Physical Properties

Magnitude 4.94
Spectral Type F5IV subgiant
Star Color Yellow-white (B-V 0.44)
Distance 93 ly

2Position & Identifiers

RA 15h 24m 11.9s
Dec -10° 19' 20.0"
Constellation Libra (Lib)
HR 5723
HIP 75379
HD 137052
SAO 159234
Bayer Epsilon
Flamsteed 31 Lib

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 Apr – Jun (peak: May)

5Survey Image

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6

Size Comparison

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7

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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

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14Stellar Notes

226.95d, K 14.0k/s, V0 -9.7k/s, asini 32.0. Unresolved by speckle interferometry.
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.

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