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Deneb

Deneb, designated Alpha Cygni, is the brightest star in the constellation Cygnus (the Swan) and one of the most prominent stars in the night sky, with an apparent magnitude around 1.25. It is a blue-white supergiant of spectral type A2 Ia. Deneb lies at a great distance from the Sun, commonly estimated at about 2,600 light-years (roughly 800 parsecs). Despite this distance, its intrinsic luminosity is immense, estimated at about 200,000 times that of the Sun. Its radius is of the order of hundreds of solar radii, and its surface temperature is around 8,500 K, giving it a characteristic blue-white hue.

In the sky, Deneb forms part of the Summer Triangle asterism, along with Vega and Altair. It

marks
the
tip
of
the
Swan’s
tail
in
Cygnus,
and
its
name
derives
from
the
Arabic
word
for
tail.
Deneb
is
catalogued
in
multiple
star
catalogs,
including
the
Bayer
designation
Alpha
Cygni,
with
several
identifiers
such
as
HD,
HIP,
and
HR
numbers
used
by
professional
catalogs.
Because
of
its
high
luminosity
and
distance,
Deneb
is
a
subject
of
studies
on
massive
star
evolution
and
stellar
atmospheres,
and
it
is
expected
to
end
its
life
in
a
core-collapse
supernova
on
timescales
of
several
million
years.