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Astronomy & Telescope Astronomy: Comet

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  Comet Comet: Astronomy: Comet - Travel-HOW COMETS TRAVEL

HOW COMETS TRAVEL

Like the planets and their moons, comets travel about the Sun in paths known as orbits. The orbits of the major planets are almost circular, but the orbit of a comet such as Halley's is a much more elongated ellipse. A comet coming in from the Oort Cloud has an even more extended orbit: it speeds round the Sun and then heads out for a trip that either never ends or will not bring it back for millions of years. On rare occasions, a comet travels in on an elliptical orbit, but then encounters a large planet such as Jupiter, whose gravity puts it into a new, hyperbolic orbit that ejects it from the Solar System forever.

 
 
  Posted by astronomy on Monday, November 29 @ 03:12:58 CST (13 reads)
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  Comet Comet: Astronomy: Comet - Search-HOW TO SEARCH FOR COMETS

HOW TO SEARCH FOR COMETS

A comet can appear anywhere in the sky. In 1995, Alan Hale and Tom Bopp found Comet Hale-Bopp when they both happened to be looking at Messier 70, a globular star cluster in Sagittarius. Most comets, however, brighten only when they are near the Sun, and appear either in the western sky after dusk or in the eastern sky before dawn.

 
 
  Posted by astronomy on Monday, November 29 @ 03:11:55 CST (12 reads)
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  Comet Comet: Astronomy: Comet - Photographing-CAPTURING A COMET ON FILM

CAPTURING A COMET ON FILM

Although photographing a comet is a challenging task, the results can be pectacular.

 
 
  Posted by astronomy on Monday, November 29 @ 03:10:59 CST (15 reads)
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  Comet Comet: Astronomy: Comet - Observing-OBSERVING COMETS

OBSERVING COMETS

Although some 25 comets are found each year, most of these are much too faint to appear in small telescopes. However, several comets of 11th magnitude or brighter appear annually, usually when they are close to the Sun. Almost always discovered by amateur astronomers, you can often see these comets in small scopes when the sky is dark and moonless.

 
 
  Posted by astronomy on Monday, November 29 @ 03:09:50 CST (12 reads)
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  Comet Comet: Astronomy: Comet - Observation-RECORDING YOUR

RECORDING YOUR OBSERVATIONS

Estimating brightness is one of the most common activities for a comet watcher, but it can also be one of the trickiest. Among experienced observers, a popular procedure is the Sidgwick, or "in-out," method.

 
 
  Posted by astronomy on Monday, November 29 @ 03:07:37 CST (10 reads)
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  Comet Comet: Astronomy: Comet - Discovered-WHAT IF YOU THINK YOU HAVE DISCOVERED

WHAT IF YOU THINK YOU HAVE DISCOVERED A COMET?

 
 
  Posted by astronomy on Monday, November 29 @ 03:06:28 CST (10 reads)
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  Comet Comet: Astronomy: Comet - Description-WHAT IS A COMET

WHAT IS A COMET?

Imagine a snowball several miles wide, loosely packed with rocky or muddy material. Far from the Sun, a comet consists of little else. Within the snowball are ices of water, cyanogen, and other materials, as well as what scientists call CHON particles—organic material containing carbon, hydrogen, oxygen, and nitrogen.

 
 
  Posted by astronomy on Monday, November 29 @ 03:05:20 CST (10 reads)
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  Comet Comet: Astronomy: Comet - COMET TAIL

COMET TAIL

There are two main types of comet tail. Ioized gas forms an ion tail, which appears bluish, while dust particles form a yellowish dust tail. The dust tail curves out from the comet under the pressure of sunlight.

 
 
  Posted by astronomy on Monday, November 29 @ 03:04:10 CST (11 reads)
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  Comet Comet: Astronomy: Comet - CHARLES MESSIER: THE COMET FERRET

CHARLES MESSIER: THE COMET FERRET

Parisian Charles Messier (1730-1817) found his first comet in 1759, and proceeded to locate new ones almost ever/ year there-after. He was so successful that King Louis XV called him the "Comet Ferret." Messier worked at the Marine Observatory in Paris, supported by a pension from his friend, Jean Baptiste de Saron, President of the Paris Parliament and an expert in comet-orbit calculation.

 
 
  Posted by astronomy on Monday, November 29 @ 03:02:34 CST (10 reads)
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  Comet Comet: Astronomy: Comet - ANCIENT COMETS

ANCIENT COMETS

Comets are among the oldest objects in the Solar System, almost unchanged since they were formed billions of years ago. The primordial Solar System was a large, flattened cloud that spun slowdy, its center slowly building to become the Sun, its outskirts condensing to become the planets.

 
 
  Posted by astronomy on Monday, November 29 @ 03:01:38 CST (8 reads)
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