Features Of Interest

ALPHA (a) CYGNI (DENEB) 2 An immensely luminous supergiant. At magnitude 1.3 and over 3,000 light-years away, it is the most distant first-magnitude star.

BETA (P) CYGNI (ALBIREO) 5 A beautiful colored double star in the beak of the swan. The two stars can just be seen separately through binoculars, if steadily mounted, and are an easy target for a small telescope. The brighter star, magnitude 3.1, is orange and contrasts strikingly with the fainter one, magnitude 5.1, which is blue-green.

OMICRON-1 (01) CYGNI 1 5 A wide double for binoculars consisting of a 4th-magnitude orange star with a bluish 5th-magnitude companion.

CHI (x) CYGNI 2 1 5 A pulsating red giant of the same type as Mira. At its brightest, which it reaches every 13 months or so, it can appear of 3rd magnitude and is hence easily visible to the naked eye, but it fades to as faint as 14th magnitude so its full range can be followed only through telescopes.

61 CYGNI 5 An easy double for small telescopes, consisting of two orange dwarfs of 5th and 6th magnitudes that orbit each other every 650 years.

M39 1 5 A large open cluster in northern Cygnus. It covers an area similar in size to a full moon and is easily visible through binoculars. It is triangular in shape with a double star at the center.

NGC 6826 (THE BLINKING PLANETARY) 5 A planetary nebula with a blue-green disk similar in size to the outline of Jupiter. It is popularly known as the Blinking Planetary, because it appears to blink on and off as the observer looks alternately at it and then to one side.

NGC 6992 (VEIL NEBULA) 5 S A huge loop of glowing gas, the remains of a star that exploded as a supernova thousands of years ago.

NGC 7000 1 5 S A large glowing gas cloud near Deneb. It can be glimpsed through binoculars on clear, dark nights.

CYGNUS RIFT (THE NORTHERN COALSACK) 2 1 A cloud of dust that divides the Milky Way in two.

CYGNUS A AND CYGNUS X-1 3 Two objects that are beyond the reach of amateur observers but are of considerable astrophysical interest. Cygnus A is a powerful radio source, the result of two galaxies colliding billions of light-years away in distant space. Cygnus X-1 is an intense X-ray source near Eta (n) Cygni and is thought to be a black hole in orbit around a 9th-magnitude blue supergiant about 8,000 light-years away in our own galaxy.

Andromeda Andromedae (And)

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A constellation of the northern sky, Andromeda adjoins Pegasus. One of the original Greek constellations, it depicts the daughter of the mythical Queen Cassiopeia, who is represented by the constellation to its north. Andromeda's head is marked by Alpha (a) Andromedae, which also forms one corner of the Square of Pegasus—long ago, this star was regarded as northern

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