Chara (Beta Canum Venaticorum)
Lying at a distance of only 27 light years, Chara is G-type star with a surface temperature of 5860 K (just 80 K hotter than the Sun), a mass 8% greater than the Sun's, a radius 11% larger, and a luminosity 20% greater. Since main sequence stars brighten and swell somewhat as they age, Chara may be one or two billion years older than the Sun. Chara has also been detected in the X-ray part of the spectrum, implying that it too has a surrounding hot corona, as expected. Extending the solar similarity, Chara even rotates at a similar speed. The metallicity – a measure of the "heavy" element abundance – of Chara is in the range 59-120% of solar, placing it well within the range for which a star could be expected to host a system of planets. The orbit of a hypothetical Earth-like planet, capable of supporting liquid water on its surface, would have an orbit around Chara at a mean distance of approximately 1.1 AU (10% greater than the Earth-Sun distance) with an orbital period of about 1.1 Earth years.
Related categories NOTABLE STARS
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