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Azha — Star in Eridanus

HIP 13701; Eta Eridani; 3 Eridani

Magnitude 3.9m Star Eridanus (Eri) Visible
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About Azha

Description

Azha, Eta Eridani, is a K-type giant of spectral class K0 III about 137 light-years away in the northern part of Eridanus. It shines at magnitude 3.89 and is a red-clump giant actively fusing helium in its core. Its mass is about 1.5 Suns and radius about 11 Suns.

Observing Tips

Azha sits just east of the Hyades in the celestial sky, in the northwestern part of Eridanus. In binoculars it appears as a warm yellow-orange point. Best observed October through February.

History

The name Azha comes from the Arabic "al-ḍā'iḥ," meaning "the breeding ground" or "hatching place" — possibly referencing a pre-Islamic astronomical nesting-site theme. The IAU adopted the name in 2016.

Fun Facts

The name Azha is one of several obscure Arabic-origin star names whose precise etymological origin has been lost — medieval Arabic astronomy had rich regional variations, and many traditional star names survive without complete documentation of their original meanings.

Observe

1Physical Properties

Magnitude 3.89
Spectral Type K0 III giant
Star Color Orange (B-V 1.11) (reddened by dust)
Distance 137 ly

2Position & Identifiers

RA 02h 56m 25.7s
Dec -08° 53' 53.0"
Constellation Eridanus (Eri)
HR 874
HIP 13701
HD 18322
SAO 130197
Bayer Eta
Flamsteed 3 Eri

3How easy to spot?

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

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.

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Stellar Fusion

Discover

15Stellar Notes

Wolf 630 group.
Azha.
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Light Travel Time Machine

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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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