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Lambda Librae — Star in Libra

Magnitude 5.0m Star Libra (Lib) Visible
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1Physical Properties

Magnitude 5.03
Spectral Type B2.5V
Star Color Blue (B-V -0.01)

2Position & Identifiers

RA 15h 53m 20.1s
Dec -20° 10' 02.0"
Constellation Libra (Lib)
HR 5902
HIP 77811
HD 142096
SAO 183895
Bayer Lambda
Flamsteed 45 Lib
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 Apr – Jun (peak: May)

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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14Stellar Notes

5.3, 7.3v, sep. 0.0002", about 11.5d.
Sco OB2; doubtful member of the Sco-Cen cluster.

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.

Kappa Lib
Easy
Cool red giant
Star mag 4.74 2.7° Libra
IC 4592
Medium+
Reflection nebula around a bright star
Reflection Nebula mag 3.90 4.4° Scorpius
M80
NGC 6093
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 7.2 6.2° Scorpius
NGC 5903
Medium+
Elliptical galaxy
Galaxy mag 11.5 8.9° Libra
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