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J20000
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Sagittarius
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18<sup>h</sup> 27<sup>m</sup> 582<sup>s</sup>
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-25° 25' 18"
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K1+IIIb
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+282
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773 ± 16
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237 ± 05
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(λ Sgr / λ Sagittarii) is a
Star within the
Constellation Sagittarius . The star marks the top of the Archer's bow. It also has the traditional name '''Kaus Borealis'''.
The traditional name is derived from "bow" (''qaws'' Arabic) + "northern" (''borealis'' Latin). Below it lie the other stars of the bow,
Kaus Media and
Kaus Australis . Kaus Borealis also marks the top of the lid of the so-called "Teapot"
Asterism .
Kaus Borealis is a
Spectral Class K orange giant star. It is currently fusing
Helium into
Carbon and
Oxygen in its core. Kaus Borealis is 77
Light Year s from us, with a mass 2.3 times that of the
Sun It is 52 times more luminous than the
Sun and has a radius of some 11 Suns.
Being near the
Ecliptic , Lambda Sgr is sometimes
Occulted by the
Moon and , more rarely by a
Planet . The last planet to pass in front of it was
Venus , on
19 November 1984 . The previous occasion was on
5 December 1865 , when it was occulted by the planet
Mercury .
