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The orange-red Beta Ceti, also known as Deneb Kaitos, shines very bright in X-rays. It already finished its red giant stadium, when it fusioned in its outer areas hydrogen to helium. Now the star has shrinked again, fusioning helium to carbon in its core.

Constellation: Cetus
Age: 1 billion years
Distance: 95.8 light-years
Spectral class: K1
Visual magnitude: 2.04
Luminosity: 115 * Sun
Mass: 3 * Sun
Diameter: 23.4 * Sun
Radial velocity: 13.3 km/sec

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Diphda in X-rays.
Photo: Nasa

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