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Out Of Mind » SOLAR & PLANETARY ALERTS & INFO » ATMOSPHERIC CHANGES » Ring in New Year with Comet Catalina

Ring in New Year with Comet Catalina

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1 Ring in New Year with Comet Catalina on Thu Dec 31, 2015 9:51 am

PurpleSkyz

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Ring in New Year with Comet Catalina

Before dawn on January 1, Comet Catalina is very near on the sky’s dome to the bright star Arcturus! Look east.


Facing east beginning around 4:30 a.m. local time until sunrise on December 31 to January 2, 2016. As the New Year begins, Comet Catalina is passing very close to the bright yellow (some say orange) star Arcturus. This bright star will make an excellent reference for finding the celestial visitor. Illustration by Eddie Irizarry using Stellarium.
UPDATE DECEMBER 31, 2015: Try looking for Comet C/2013 US10 (Catalina) a few hours after celebrating New Year. On the early morning of January 1, 2016, you’ll find the comet passing near a bright star, Arcturus in the constellation Bootes. It isn’t visible to the eye alone, but binoculars should reveal it as a small fuzzy patch of light in your predawn sky. If you received a telescope or binoculars for Christmas, this comet would make a fantastic target. Start the New Year right, and share a view of this comet with friends or family! Current brightness estimates put Comet Catalina at a magnitude 6.2 to 6.4, just below the level for viewing with the unaided eye, but visible in binoculars, and a fine object for a small telescope. Notice the illustrations above and below, and you’ll see how easy it will be to find Comet Catalina as 2016 begins!
When and where should I begin to look?
What will Comet Catalina look like?
Here are some important dates
When is the next predicted comet visible to the eye alone?

Facing east beginning around 4:30 a.m. local time until sunrise in early January. How can you know which star is Arcturus? The stars that form the Big Dipper’s handle point to this star. Illustration by Eddie Irizarry using Stellarium.

Comet Catalina on December 7 by Geraint Smith in New Mexico.
When and where should I begin to look? The comet has been in our predawn sky throughout this past month. Its brightness has been pretty steady. As the New Year begins, it will gradually become a night sky object.
The comet was closest to the sun on November 15, so it is moving away from the sun now. But it’s still drawing closer to the Earth. On January 17, 2016, Comet Catalina will be at its closest point to Earth, about some 68 million miles (110 million km) away. That’s in contrast to the moon’s distance of about a quarter million miles … so you can see the comet is coming nowhere near us. Still, as it passes closest to Earth during mid-January, we might see the comet appearing a bit brighter than now.
By all reports, Comet Catalina has never risen above magnitude 6, the limit of visibility to the unaided eye. But it has hovered just below that limit. The moon was full on December 25, meaning its light is flooding the predawn sky now. But the moon will be waning, becoming smaller in our sky, in the weeks ahead. If you go to a location far from city lights – say, beginning around New Year’s, when the moon is waning in the predawn sky, you might be able to sweep with your binoculars and find the comet.
Remember … the comet is moving slowly across our sky’s dome. Below you’ll find some charts that should help you find it. Or check out this chart from skyandtelescope.com.

Comet Catalina images taken December 4, 2015 by Doug Durig. Here, you can see some detail in the comet’s tail …
What will Comet Catalina look like? The comet’s tail has been some 500,000 miles (800,000 km) long! And it has shown a double tail. Some photos have captured even more detail. With binoculars, though, you’re likely to spot the comet as a small, circular, hazy patch. You might see at most a short tail for this comet. It’s likely you won’t see any color at all.
Telescopes will provide a better view. Even while observing visually with a telescope, you will not see the green color of the comet, as shown some photos. That color is mainly seen in pictures of this comet, and many comets. Cameras are more sensitive than the human eye and after a few seconds or minutes of exposure, they provide very good views of the colors that exist in comets.
But visual observers using telescopes in December, 2015, might be able to glimpse a hint of Comet Catalina’s green coma or cometary atmosphere.
And, by the way, the green color we see in comets is from gases like diatomic carbon.

View larger. | Greg Hogan in Kathleen, Georgia caught this photo on December 7, 2015. He wrote: “So what are the odds? I was going through the images from Dec 7th and noticed that in one of the shots there was two meteors! One was the tail end of a bright one, and one is faint. I saw some large bright ones that morning but was not sure if they were in the frame. It seems part of one was.”
Here are some important dates.
October 31, 2013. The Catalina Sky Survey in Arizona discovered a comet, later called C/2013 US10 (Catalina). At first, astronomers thought it was a rocky or metallic asteroid, but further observations confirmed it as an icy comet.
November 15, 2015. Comet Catalina was at perihelion or closest to the sun. It did not come as close to the sun as some comets do. At closest approach to our star, the comet was moving between the orbits of planets Earth and Venus. Its perihelion distance was 0.82 AU from the sun (1 AU = 1 Earth-sun distance). Comet Catalina was traveling at a speed of 103,000 miles per hour (166,000 km/h) relative to the sun at perihelion.
November 23 to 30,2015. Comet Catalina became visible for Northern Hemisphere observers.
December 7,2015. Sky show! Comet Catalina was visible close to Venus and the waning moon.
December 31,2015. Comet will be approaching the apparent position of the star Arcturus on our sky’s dome. Another good photo opportunity.
January 1,2016. Comet Catalina will be passing very close to star Arcturus. An excellent reference to finding the comet in the sky!
January 17,2016. Comet Catalina will pass some 68 million miles (110 million km) from Earth. That’s very, very far from Earth – hundreds of times farther than the moon’s distance. So there is no danger of a collision. That said, let’s talk about the size of the comet’s nucleus or core. Some estimates indicate the nucleus of Comet Catalina ranges between 4 and 20 kilometers in diameter.

January 1, 2016, from 2 a.m. to sunrise, local time. The comet will be very near the bright star Arcturus in the constellation Bootes. Photo opportunity!
When is the next predicted comet visible to the eye alone? The next predicted comet that may be reach visibility to the unaided eye – and be really easy to spot – is Comet 46P/Wirtanen. It will appear as a sky gift for Christmas of 2018.
Although Comet 46P may show a magnitude of 3 or 4, there is always the possibility that a newly found comet will provide a good celestial show prior to that time.
Bottom line: Comet C/2013 US10 (Catalina) is now visible in binoculars, in December, 2015. When and where to look, what to expect, some important dates to remember.
Look here for a chart from skyandtelescope.com showing the comet on various dates




Thanks to:http://earthsky.org



  

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