If you had been around, you would have been able to see it in the daytime sky! Today, we can only see this supernova remnant with the help of specialized telescopes. This explosion was seen and recorded in 1572 by many people. Cassiopeia B (you run out of fun names after a while) is the remnant of another supernova. It also emits strongly in the x-ray frequencies, which has helped astronomers discover what it’s made of. The collapsed core of this dead star is spinning and emitting pulses of energy that astronomers pick up around the 1GHz (radio) frequency of the spectrum. One of these remnants is Cassiopeia A, one of the strongest radio sources in our sky. There are stellar remains in Cassiopeia too: supernova remnants. To see a few more stars, you can pick up a pair of binoculars to look at Messier 103, an open cluster of stars whose light has taken over 8,000 years to reach us. This fast spin means that Beta Cas is an “oblate spheroid”-its equator bulges outward, the same way a balloon would if you pressed it between your hands. Beta Cas is a star that completes one full rotation every 1.12 Earth days. Let’s start with one of those five main stars. Hiding in the depths of the night sky, we find a plethora of objects begging to be explored. If we look a little closer in Cassiopeia, we’ll find that there’s more to this constellation than meets the eye. But a constellation is more than just the main stars to astronomers, a constellation is one of 88 defined regions of our sky. Cassiopeia has five main stars, whose Greek names are Epsilon, Delta, Gamma, Alpha, and Beta-all followed by ‘Cas’ for Cassiopeia. When we look at the stars that make up the constellation, they form a W or M shape across the belt of the Milky Way. She’s said to be the ancient queen of a land near Ethiopia, eternally punished for her vanity and ego. Cassiopeia is one of the brightest constellations in our northern sky. Not too far away from it is a constellation with a distinctive shape-Cassiopeia. The big dipper (Ursa Major) is a popular one here in Minnesota. IC 10 is an irregular galaxy that is the closest known starburst galaxy and the only one in the Local Group of galaxies.If you go outside on a clear night and look up, you’ll likely recognize a few shapes. A rich section of the Milky Way runs through Cassiopeia, containing a number of open clusters, young luminous galactic disc stars, and nebulae. Fourteen star systems have been found to have exoplanets, one of which- HR 8832-is thought to host seven planets. Cassiopeia A is a supernova remnant and the brightest extrasolar radio source in the sky at frequencies above 1 GHz. In 1572, Tycho Brahe's supernova flared brightly in Cassiopeia. The constellation hosts some of the most luminous stars known, including the yellow hypergiants Rho Cassiopeiae and V509 Cassiopeiae and white hypergiant 6 Cassiopeiae. In the (sub)tropics it can be seen at its clearest from September to early November, and at low southern, tropical, latitudes of less than 25°S it can be seen, seasonally, low in the North.Īt magnitude 2.2, Alpha Cassiopeiae, or Schedar, is generally the brightest star in Cassiopeia, though it is occasionally outshone by the variable Gamma Cassiopeiae, which has reached magnitude 1.6. Visible at latitudes between + 90° and − 20°.īest visible at 21:00 (9 p.m.) during the month of November.Ĭassiopeia is located in the northern sky and from latitudes above 34°N it is visible year-round. for the constellation also / ˌ k æ s i ˈ oʊ p i ə/ Cássiópeia
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