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Lambda Hydri — Star in Hydrus

Magnitude 5.1m Star Hydrus (Hyi) Visible
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Observe

1Physical Properties

Magnitude 5.07
Spectral Type K5III giant
Star Color Red (B-V 1.37)
Distance 130 ly

2Position & Identifiers

RA 00h 48m 35.4s
Dec -74° 55' 24.0"
Constellation Hydrus (Hyi)
HR 236
HIP 3781
HD 4815
SAO 255710
Bayer Lambda

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium Hard+ 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 Aug – Oct (peak: Sep)

5Survey Image

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Size Comparison

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Spectral Classification

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Hertzsprung-Russell Diagram

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Stellar Lifecycle

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Blackbody Spectrum

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Stellar Absorption Spectrum

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

13

Stellar Fusion

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Light Travel Time Machine

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Relativistic Travel

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