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Menkent — Star in Centaurus

Theta Cen

Magnitude 2.1m Star Centaurus (Cen) Visible
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About Menkent

Description

Menkent is an orange giant of spectral type K0IIIb at magnitude 2.06 in Centaurus. Located about 61 light-years from Earth, it has a luminosity of roughly 60 times solar. It is one of the closer giant stars to the Sun, marking the shoulder or front leg of the Centaur.

Observing Tips

Menkent lies in the northern part of Centaurus, visible from latitudes south of about 30°N. It is separated from the brighter Alpha and Beta Centauri by a considerable gap, sitting well to the northwest. Its warm orange color is noticeable. Best observed April through July.

History

The name Menkent comes from the Arabic 'mankib al-qinturus,' meaning 'the shoulder of the Centaur.' At only 61 light-years, it is one of the nearest orange giant stars visible to the naked eye, making it a good example of a star at this evolutionary stage.

Fun Facts

Menkent's proximity (61 light-years) makes it one of the closest giant stars to the Sun, giving astronomers an excellent nearby example of a star that has exhausted its core hydrogen and expanded.

Observe

1Physical Properties

Magnitude 2.06
Spectral Type K0III giant
Star Color Orange (B-V 1.01)
Distance 59 ly

2Position & Identifiers

RA 14h 06m 41.0s
Dec -36° 22' 12.0"
Constellation Centaurus (Cen)
HR 5288
HIP 68933
HD 123139
SAO 205188
Bayer Theta
Flamsteed 5 Cen

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Easy Easy Easy
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 Mar – May (peak: Apr)

5Survey Image

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Explore

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Size Comparison

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Compare Stars

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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

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15Stellar Notes

Theta Cen group?
Menkent.
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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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