Tonight

Cassiopeia the Queen reigns in February

Cassiopeia: Five dots linked with lines to make the letter W and two clusters above.
You can find Cassiopeia the Queen in the northwest during the evening around the month of February. The constellation has the shape of an M or W. If you have a dark sky, you can look above Cassiopeia for a famous binocular object. This is the Double Cluster in Perseus.

Cassiopeia the Queen in late winter and early spring

On late winter evenings and throughout northern spring, Cassiopeia the Queen descends from her throne in the northwest after nightfall. Cassiopeia is one of the easiest constellations to spot because of its distinctive shape. Cassiopeia looks like the letter W or M. Look for the Queen as your sky gets dark in February and March. She’ll be lower in the northwest as spring begins to unfold. For those in the northern U.S. and Canada, Cassiopeia is circumpolar, or above the horizon all night every night.

The stars of Cassiopeia

Cassiopeia is home to five bright stars that form the W shape. Some describe these stars as outlining the chair – or throne – she sits upon. If you’re viewing Cassiopeia as the letter W, the stars, from left to right, are Segin, Ruchbah, Gamma Cassiopeiae, Schedar and Caph.

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White chart with black dots and line forming a W.
Many observers use the arrow shape of Cassiopeia to point their way to the Andromeda galaxy. Image via Wikimedia Commons.

How to find Cassiopeia

Cassiopeia is opposite the Big Dipper in the northern sky. That is, the two constellations lie on opposite sides of the pole star, Polaris. So when Cassiopeia is high in the sky, as it is on evenings from about September through February, the Big Dipper is low in the sky. Every March, when the Dipper is ascending in the northeast, getting ready to appear prominent again in the evening sky, Cassiopeia is descending in the northwest.

Animated diagram of Cassiopeia stars and Big Dipper circling around Polaris.
The Big Dipper and the W-shaped constellation Cassiopeia circle around Polaris, the North Star, in a period of 23 hours and 56 minutes. The Dipper is circumpolar at 41 degrees north latitude, and all latitudes farther north.

Neighboring star clusters

If you have a dark sky, look across the border of Cassiopeia into Perseus for a famous binocular object. This is the Double Cluster in Perseus. These are open star clusters, each of which consists of young stars still moving together from the primordial cloud of gas and dust that gave birth to them.

These clusters have a unique set of mismatched names: H and Chi Persei. Their names are from two different alphabets, the Greek and the Roman. Stars have Greek letter names, but most star clusters don’t. Johann Bayer (1572-1625) gave Chi Persei – the cluster on the top – its Greek letter name. Then, it’s said, he ran out of Greek letters. That’s when he used a Roman letter – the letter H – to name the other cluster.

Lore of Cassiopeia

In skylore and in Greek mythology, Cassiopeia was a beautiful and vain queen of Ethiopia. It’s said that she committed the sin of pride by boasting that both she and her daughter Andromeda were more beautiful than Nereids, or sea nymphs.

Her boast angered Poseidon, god of the sea, who sent a sea monster (Cetus the Whale) to ravage the kingdom. To pacify the monster, Cassiopeia’s daughter, Princess Andromeda, was left tied to a rock by the sea. Cetus was about to devour her when Perseus the Hero happened by on Pegasus the Winged Horse.

Perseus rescued the princess, and all lived happily . . . and the gods were pleased, so all of these characters were elevated to the heavens as stars.

But – because of her vanity – Cassiopeia suffered an indignity. At some times of the night or year, this constellation has more the shape of the letter M, and you might imagine the Queen reclining on her starry throne. At other times of year or night – as in the wee hours between midnight and dawn in February and March – Cassiopeia’s Chair dips below the celestial pole. And then this constellation appears to us on Earth more like the letter W.

It’s then that the Lady of the Chair, as she is sometimes called, is said to hang on for dear life. If Cassiopeia the Queen lets go, she will drop from the sky into the ocean below, where the Nereids must still be waiting.

Old-fashioned drawing of Queen Cassiopeia in Greek garb upside down on her throne.
Johannes Hevelius depicted Cassiopeia on her chair in the 1600s.

Bottom line: The constellation Cassiopeia the Queen has the distinct shape of a W or M. Find her descending from her throne on northern spring nights.

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Posted 
February 17, 2022
 in 
Tonight

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