High Quality Content by WIKIPEDIA articles! Xi Cephei is a star in the constellation Cepheus. It has the traditional name Kurhah or Alkirdah or Al Kirduh. Xi Cephei belongs to spectral class A3/6Vm and has apparent magnitude +4.29. It is approximately 100 light years from Earth. A star is a massive, luminous ball of plasma held together by gravity. The star nearest to Earth is the Sun, which is the source of most of the energy on Earth. Other stars are visible in the night sky, when they are not outshone by the Sun. Historically, the most prominent stars on the celestial sphere were grouped together into constellations, and the brightest stars gained proper names.

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