Bookmark Kaumudi Online  Bookmark this site  Editor@Kaumudi  |  Marketing  Print Advt rates  |  Calendar 2012        Go!    
 
 
January 19, Friday 2018 8:53 PM       

       HEADLINES: Why we need these MPs to talk only in channels, asks K Surendran                                              B Sandhya removed as ADGP, South                                              Was son killed over property dispute? Police unwilling to accept Jaya's statement                                              CBI will probe Sreejiv’s death, order passed                                              Actress attack case: No action on Dileep’s complaint on charge sheet leak                                              Fire breaks out in Mumbai's Navrang Studio                                              Solution to SC judges’ row likely on Monday                                              EC has never touched this low: AAP                                              Hafiz Saeed should be prosecuted: US                                              India should not comment on Chinese construction in Doklam: Beijing                                              Pak-Iran to resume rail services                                              Kulbhushan Jadhav abducted from Iran: Baloch activist                                              ICC U-19 WC: India thrash Zimbabwe to top Group B                                              We will definitely try to get Ashwin back in CSK: Dhoni                                              AIFF U-16 team departs for exposure trip to Dubai                                              Kaumudi Facebook
       SCI&TECH Next Article: Hottest known planet in universe discovered  
       Threat of asteroid impact looming over Earth: experts
 
         Posted on :18:04:13 Jun 7, 2017
   
A A
       Last edited on:18:04:13 Jun 7, 2017
         Tags: Threat of asteroid impact, Earth
 

LONDON: The risk of a sizeable asteroid hitting the Earth is significantly growing every few years, warn Czech scientists who analysed 144 fireballs from a recent meteor shower.

The Taurid meteor shower showed significantly enhanced activity in 2015. Researchers found that this was due to a well defined orbital structure.

Researchers from the Astronomical Institute of the Czech Academy of Sciences showed that a "new branch" of Taurids contains at least two asteroids of the size 200-300 metres.

Since it is likely that numerous of undiscovered asteroids of decameter or even larger size are present as well, impact hazard increases significantly when the Earth encounters the Taurid new branch every few years, researchers said.

The Taurid meteoroid stream produces at least four meteor showers on Earth: two are active at night from end of September until beginning of December, and two at day from end of May to the middle of July.

Although comet 2P/Encke is the most probable parent body of the Taurid stream, it was also proposed that 2P/Encke is just a fragment of a much larger comet, which was disrupted thousands years ago and formed the whole Taurid complex including a number of asteroids.

Nevertheless, many of the proposed asteroids may have similar orbits just by chance. In some years, Taurid activity has been higher than usually, especially in terms of large numbers of bright meteors or fireballs.

"We performed careful analysis of 144 Taurid fireballs observed by new digital autonomous fireball observatories of the European Fireball Network displaced over Czech Republic at 13 stations, Austria and Slovakia in 2015, when the activity was enhanced," researchers said.

Orbits of 113 fireballs show common characteristics and form together a well defined orbital structure.The masses of the observed meteoroids were in a wide range from 0.1 gramme to more than 1,000 kg."We found that all meteoroids larger than 300 grammes were very fragile, while those smaller than 30 grammes were much more compact," researchers said.

The newly discovered Taurid branch is a population of bodies with the size range from several millimetres to several hundred of meters, which all move together around the Sun.

The narrow range of orbital parameters of the new branch makes the association of Taurids with these asteroids much more reliable than it was possible before.

Every few years, the Earth is encountering this branch for a period of about three weeks. During that time, the chance of impact of a sizeable asteroid (tens of meters) is significantly enhanced. Even if intrinsically weak, bodies of such size can penetrate deep in the atmosphere and pose a hazard to the ground.

A A
       SCI&TECH
Next Article: Hottest known planet in universe discovered
 
 
SCI&TECH HEADLINES
Secret of longevity protein revealed!  
Absence of this gene can give men deadly cancer  
Soon, you can demote group admins on WhatsApp  
Regular yoga can slow down ageing of brain: Study  
What are haemorrhoids (piles) and what causes them?  
WhatsApp facilitates quick switch from voice to video call  
The Thin and Light Lenovo Ideapad 720s shines at Digit Zero 1 Awards  
Frequent heartburns up cancer risk in older adults  
Blueberry vinegar can help fight dementia  
iPhones with older batteries will take a hit in performance: Apple  
Eighth planet found in faraway solar system, matching ours  
Google brings a host of new features on Pixel 2  
Scientists turn beer into suitable petrol  
Space gives a sense of humbleness: NASA astronaut  
Researchers discover genes to prolong human life  
Google announces best apps of 2017  
This technology can help to reduce accidents on icy roads  
Yepzon launches in India; promises smart safety solutions  
Soon, you'll be able to control diabetes with your phone  
Turning bacteria into 'world's smallest tape recorders'  
How breastmilk protects babies from food allergy decoded  
Stars among the oldest in our galaxy discovered  
Apple delays release of smart speaker - HomePod  
Owning a dog may add years to your life  
'Textisms' actually add meaning to written words  
 
Do you think even today police resort to third degree torture to prove crime?
yes
 
no
 
no opinion
 
 
 
Home Kerala India World Business Sports Sci&Tech Education Automobile CityNews Movies Environment Letters 
© Copyright keralakaumudi Online 2011  |  Reproduction in whole or in part without written permission is prohibited.
Head Office Address: Kaumudi Buildings, Pettah P.O, Trivandrum - 695024, India.
Online queries talk to Deepu Sasidharan, + 91 98472 38959 or Email deepu[at]kaumudi.com
Customer Service -Advertisement Disclaimer Statement   |  Copyright Policy