Crater (constellation)

Crater is a small group of stars.

It looks like a cup in the sky. This cup sits on the back of a big snake.

The stars in the cup are very special. Some are orange and very large. They are much bigger than our Sun. One star is even part of a pair. This pair has a small white star in it. Seven of these star groups have planets. You can also find far-off galaxies here. The cup is a bright sight to find.

Crater is a small group of stars in the southern sky.

Its name comes from a Greek word for a cup. In old stories, this cup belongs to the god Apollo. The cup sits on the back of a water snake. This snake is a larger constellation called Hydra.

The stars in Crater are very interesting. The brightest star is named Delta Crateris. It is an orange giant star. This means it is much larger and cooler than our Sun. Another star, Alpha Crateris, is also an orange giant. There is a star system called Beta Crateris. It is made of two stars. One is a white giant and the other is a white dwarf. Scientists found seven star systems with planets in this area. You can also find far-off objects here. There are galaxies like NGC 3981.

There is even a quasar, which is a very bright object far away. Crater covers a small part of the sky. It is the 53rd largest constellation of the 88 known groups.

Crater is a small constellation in the southern sky. Its name comes from the Greek word for a cup used to mix wine with water.

This group of stars is important because it tells many ancient stories. One story says the cup belongs to the god Apollo. It sits right on the back of a huge water snake called Hydra. The constellation covers a small part of the sky. It is the 53rd largest of the 88 known constellations. It makes up about 0.685% of the whole sky.

Many interesting things happen within these star borders. The stars Delta Crateris and Alpha Crateris are both orange giants. These stars are much larger and cooler than our Sun. Delta Crateris is 163 light-years away and is 1.0 to 1.4 times as massive as the Sun.

Alpha Crateris is about 141 light-years away and is 1.75 times as massive as the Sun. It has also expanded to be 13.2 times the diameter of our Sun. There is also a system called Beta Crateris. This is a binary star system, which means it has two stars. It has a white giant and a tiny white dwarf.

People have studied Crater for a very long time. An astronomer named Ptolemy listed it in the second century. Later, a German cartographer named Johann Bayer used Greek letters to label the stars. He used letters from alpha through lambda. Another man named John Flamsteed gave names to 31 stars in this area. He even called the area Hydra et Crater. In 1922, the International Astronomical Union gave it the short name Crt. In 1930, Eugène Delporte set the official boundaries.

There are many specific facts about the objects in Crater. Seven different star systems here have planets.

One star, HD 96167, has a planet that is 68% the mass of Jupiter. Another star, BD-10°3166, has a planet that orbits very quickly in just 3.49 days. You can also find deep-sky objects like the Crater 2 dwarf galaxy. This galaxy is about 380,000 light-years away. There is also a very bright quasar named RX J1131. This object is 6 billion light-years away from us.

Looking at Crater helps us connect to the history of our world. Different cultures saw different things in these stars. In China, these stars are part of the Vermillion Bird of the South. They represent the wings of a red bird named Yi.

In the Society Islands, people called it a name meaning a vortex ocean. These different names show how people everywhere look at the same sky. Whether it is a cup or a bird, the stars bring people together. It is a wonderful way to explore the universe from home.

Crater is a small constellation located in the southern celestial hemisphere. Its name is the Latinized version of the Greek word *krater*, which describes a large cup used for mixing wine with water.

This constellation is significant because it serves as a window into various stellar life cycles and deep-space phenomena. It covers 282.4 square degrees of the sky. This area represents 0.685% of the entire celestial sphere. Among the 88 recognized constellations, Crater ranks as the 53rd largest.

The stars within Crater demonstrate how stars change as they age. Delta Crateris is an orange giant star located 163 light-years away. It is 1.0 to 1.4 times as massive as our Sun. Because it is an aging star, it has cooled and expanded to 10 times the Sun's radius. Alpha Crateris is another orange giant star located 141 light-years from the Sun. It has a mass 1.75 times that of the Sun. This star has exhausted its core hydrogen, causing it to expand to 13.2 times the Sun's diameter. It shines with 69 times the luminosity of the Sun.

Other star systems in the constellation show more complex arrangements. Beta Crateris is a binary star system. This means it consists of two stars orbiting each other. It contains a white giant star and a tiny white dwarf. The white dwarf is so much smaller than its companion that even the Hubble Space Telescope cannot see it separately. Gamma Crateris is also a double star system. The primary is a white main sequence star. The secondary is likely an orange dwarf. These two stars take at least 1,150 years to complete one orbit around each other.

Crater is also home to fascinating variable stars. A variable star is one that changes in brightness over time. R Crateris is a semiregular variable star. It is located 770 light-years away. Its brightness fluctuates over a period of 160 days. TT Crateris is a cataclysmic variable system. This is a binary system where a white dwarf orbits an orange dwarf. The white dwarf pulls matter away from its companion star. This matter forms an accretion disk. This disk periodically ignites and erupts, causing the system to brighten significantly.

History shows that many different cultures have observed these stars. The second-century astronomer Ptolemy included Crater in his list of 48 constellations. In ancient Babylonian star catalogues from 1100 BC, these stars were likely part of the constellation Corvus. The Greek myth tells of a crow sent by the god Apollo to fetch water. The crow delayed its journey to eat figs. When it finally returned, it used a cup and blamed a water snake for drinking the water. Apollo saw through this lie and cast the crow, the cup, and the snake into the sky.

Different traditions viewed the stars through their own unique lenses. In Chinese astronomy, these stars are part of the Vermillion Bird of the South. They represent the wings of a red bird named Yi. In the Society Islands, the constellation was known as Moana-'ohu-noa-'ei-ha'a-moe-hara. This name translates to "vortex-ocean-in-which-to-lose-crime." These varied interpretations show how human culture has always used the stars to tell stories.

Beyond individual stars, Crater contains massive deep-sky objects. There are seven star systems in this constellation that host planets. For example, the star HD 96167 has a planet with a mass 68% that of Jupiter. The star BD-10°3166 hosts a "hot Jupiter" planet that orbits its star in only 3.49 days. The constellation also contains galaxies like NGC 3981. This is a spiral galaxy that is part of the Crater Cloud.

Even more distant is the quasar RX J1131. This object is 6 billion light-years away. It contains a black hole whose spin was the first ever measured by scientists.