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Deneb
Deneb
(; a Cyg, a Cygni,
Alpha
Cygni) is the brightest
star
in the
constellation
Cygnus
, it is one of the vertices of the
Summer Triangle
and forms the 'head' of the
Northern Cross
. It is the 19th
brightest star in the night sky
, with an
apparent magnitude
of 1.25. A blue-white
supergiant
, Deneb is also one of the
most luminous nearby stars
. However, its exact distance (and hence luminosity) has been difficult to calculate; it is estimated to be somewhere between 55,000 and 196,000 times as luminous as the Sun.
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