
Location: R.A. = 1h, Dec. = 60 N
Mythology:
Cassiopeia was a beautiful and vain Queen of Ethiopia and was married to
King Cepheus. Her daughter is Andromeda. Cassiopeia's vanity angered
the sea nymphs when she boasted that she and Andromeda were more beautiful
than the Nereids, or the fifty Sea Nymphs, who were the daughters of the
God Nereus, a gentle God who became known as the famous Old Man of the
Sea. One of the Sea Nymphs, Amphitrite, was the Wife of Poseidon, the God
of the Sea. Because of this connection, the Sea Nymphs appealed to
Poseidon (also known as Neptune) to punish Cassiopeia. Poseidon sent
the sea monster Cetus to attack Ethiopia, and Cepheus was forced to offer
his daughter Andromeda as a sacrifice to Cetus by chaining her to rocks
along the coast. This part of the story goes on to tell how Perseus
saved Andromeda and slay Cetus.
Cassiopeia's involvement in the story does not end with the rescue of Andromeda.
As punishment, she is tied to her throne to revolve in the night sky, her
pride shattered by the occasional "unladylike" positions the constellation's
orientation puts her in.
The constellation Cassiopeia is often referred to as a letter W, although
some may call it an M, E, or the number 3. Cassiopeia is also in
the arm of the Milky Way Galaxy -- the pale band of light that represents
the plane of our galaxy in the night sky.
One other interesting note: The story of Cassiopeia, Cepheus, Andromeda,
and Perseus was depicted in the famous movie Clash of the Titans.
Other Interesting
Sights: The open cluster M103 is in the constellation
Cassiopeia.
Although in the constellation Perseus, the Double Cluster is found near
the southern edge of the letter W, and is a spectacular sight through even
a pair of binoculars. I mention it here because it is often easier
to find with reference to Cassiopeia than Perseus. Although the two
star clusters, NGC869 and NGC884, appear to be side by side, that
is actually an illusion because we are looking at them through the same
line of sight. One cluster is about 1,000 light-years further than
the other.
M103
The Double Cluster - NGC869 and NGC884