High Quality Content by WIKIPEDIA articles! Xi Telescopii is a star in the constellation Telescopium. Xi Telescopii is a red M-type bright giant with a mean apparent magnitude of +4.93. It is approximately 1254 light years from Earth. It is classified as an irregular variable star and its brightness varies from magnitude +4.89 to +4.94. 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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