[video=youtube_share;PU9U-4VUhAg]http://youtu.be/PU9U-4VUhAg[/video]
2 tailed 双扫把星，特别厉害，特别倒大霉！
http://www.weather.com/science/space/news/comet-catalina-two-tails
Comet Catalina is Even Cooler With Two Tails; Won't Be Back For Centuries
Published Nov 23 2015 12:25 PM EST
weather.com
00:00 / 00:29
See Comet Catalina This Month
Grab your binoculars and head outside this month. Comet Catalina will be passing by Earth and should be putting on quite a show.*
Comet Catalina has finally arrived and has become even cooler. According to EarthSky, the comet is showing two tails.*
Originally discovered by the Catalina Sky Survey on Oct. 23, 2013, Comet C/2013 US10 (Catalina) was initially believed to be an asteroid since it appeared inactive. Since then, it has become highly active, providing the opportunity for astronomers around the world to observe it.*
Enlarge
The image above shows the Catalina Comet on July 7, 2014. (NASA/JPL-Caltech)
Most comets tend to show two tails - a dust tail and a plasma tail of ionized gas. They point away from the sun and typically are not related to the direction the comet is traveling. However, they are related to how the dust and gases interact with solar heat.*
(MORE: Five Things to Know About the Catalina Comet)
After making a turn at the Sun in mid-November, Catalina has been visible in the early morning sky above the Northern Hemisphere, according to Sky & Telescope. Binoculars will help sky gazers glimpse the comet, but naked-eye sightings could be possible by mid-December
Spotting the Catalina Comet is of particular importance this year, because we’ll never see it again. According to NASA, the Catalina Comet takes more than 450 years to orbit the sun once. EarthSky.org reports that the trajectory of the comet from the Oort cloud suggests that after its close approach to the inner solar system, the Catalina Comet will be ejected.
MORE ON WEATHER.COM: Comet Pan-STARRS
Tucson, Ariz.
http://www.oregonlive.com/pacific-n...f/2015/12/oregon_skies_comet_catalina_no.html
Oregon skies: Comet Catalina visible with binoculars in the morning sky
1 / 3
By Stuart Tomlinson | The Oregonian/OregonLive
Email the author | Follow on Twitter
on December 01, 2015 at 1:40 PM, updated December 01, 2015 at 2:01 PM
Comments
Comet Catalina,*first thought by astronomers to be a near-Earth asteroid when discovered Oct. 31, 2013, is now visible with binoculars or a telescope in the morning sky above the Pacific Northwest.*
By New Years Day it should be visible with the naked eye, said Jim Todd, OMSI's director of space science education. Comet Catalina (officially C/2013 US10) was discovered by the Catalina Sky Survey near Tucson, Arizona.
"The comet received the 'US10' designation because it was initially thought to be an asteroid," Todd said in an email Tuesday.
Todd said Comet Catalina is now be at 6th magnitude brightness as it moves through the constellation Virgo, making it visible with binoculars before sunrise.
By next Monday, Dec. 7, the comet will be paired in the morning sky with the planet Venus and the waning crescent Moon.
By Christmas day, the comet's brightness will be dimmed by the Moon, but at a magnitude brightness of 4, should be visible with the naked eye. On January 12, 2016, the comet comes will be 66.9 million miles from Earth, the closest it's going to get.
By mid-January, the comet will start to fade, Todd said.
To see the comet: Sky& Telescope magazine*says it will be 8 degrees above the horizon*in the southeastern sky 70 minutes before sunrise. By December 8, it will be to the left of the constellation Virgo just before sunrise, rising each day about 1 degree higher than the day before.
-- Stuart Tomlinson
2 tailed 双扫把星，特别厉害，特别倒大霉！
http://www.weather.com/science/space/news/comet-catalina-two-tails
Comet Catalina is Even Cooler With Two Tails; Won't Be Back For Centuries
Published Nov 23 2015 12:25 PM EST
weather.com
00:00 / 00:29
See Comet Catalina This Month
Grab your binoculars and head outside this month. Comet Catalina will be passing by Earth and should be putting on quite a show.*
Comet Catalina has finally arrived and has become even cooler. According to EarthSky, the comet is showing two tails.*
Originally discovered by the Catalina Sky Survey on Oct. 23, 2013, Comet C/2013 US10 (Catalina) was initially believed to be an asteroid since it appeared inactive. Since then, it has become highly active, providing the opportunity for astronomers around the world to observe it.*
Enlarge
The image above shows the Catalina Comet on July 7, 2014. (NASA/JPL-Caltech)
Most comets tend to show two tails - a dust tail and a plasma tail of ionized gas. They point away from the sun and typically are not related to the direction the comet is traveling. However, they are related to how the dust and gases interact with solar heat.*
(MORE: Five Things to Know About the Catalina Comet)
After making a turn at the Sun in mid-November, Catalina has been visible in the early morning sky above the Northern Hemisphere, according to Sky & Telescope. Binoculars will help sky gazers glimpse the comet, but naked-eye sightings could be possible by mid-December
Spotting the Catalina Comet is of particular importance this year, because we’ll never see it again. According to NASA, the Catalina Comet takes more than 450 years to orbit the sun once. EarthSky.org reports that the trajectory of the comet from the Oort cloud suggests that after its close approach to the inner solar system, the Catalina Comet will be ejected.
MORE ON WEATHER.COM: Comet Pan-STARRS
Tucson, Ariz.
http://www.oregonlive.com/pacific-n...f/2015/12/oregon_skies_comet_catalina_no.html
Oregon skies: Comet Catalina visible with binoculars in the morning sky
1 / 3
By Stuart Tomlinson | The Oregonian/OregonLive
Email the author | Follow on Twitter
on December 01, 2015 at 1:40 PM, updated December 01, 2015 at 2:01 PM
Comments
Comet Catalina,*first thought by astronomers to be a near-Earth asteroid when discovered Oct. 31, 2013, is now visible with binoculars or a telescope in the morning sky above the Pacific Northwest.*
By New Years Day it should be visible with the naked eye, said Jim Todd, OMSI's director of space science education. Comet Catalina (officially C/2013 US10) was discovered by the Catalina Sky Survey near Tucson, Arizona.
"The comet received the 'US10' designation because it was initially thought to be an asteroid," Todd said in an email Tuesday.
Todd said Comet Catalina is now be at 6th magnitude brightness as it moves through the constellation Virgo, making it visible with binoculars before sunrise.
By next Monday, Dec. 7, the comet will be paired in the morning sky with the planet Venus and the waning crescent Moon.
By Christmas day, the comet's brightness will be dimmed by the Moon, but at a magnitude brightness of 4, should be visible with the naked eye. On January 12, 2016, the comet comes will be 66.9 million miles from Earth, the closest it's going to get.
By mid-January, the comet will start to fade, Todd said.
To see the comet: Sky& Telescope magazine*says it will be 8 degrees above the horizon*in the southeastern sky 70 minutes before sunrise. By December 8, it will be to the left of the constellation Virgo just before sunrise, rising each day about 1 degree higher than the day before.
-- Stuart Tomlinson
