The chances have plummeted that a newly discovered asteroid with the potential to wipe out a city will hit Earth on Valentine's Day 2046, the European Space Agency said on Tuesday.
The asteroid, which is named 2023 DW and is estimated to be about the size of a 50-metre Olympic swimming pool, was first seen by a small Chilean observatory on February 26.
The asteroid was given a one in 847 chance of hitting Earth. But Richard Moissl, head of the ESA's planetary defence office, told AFP on Tuesday that overnight the probability fell to one in 1,584.
"It will go down now with every observation until it reaches zero in a couple of days at the latest," Mr Moissl said. "No one needs to be worried about this guy."
Nasa on Tuesday lowered its own odds of impact to one in 770, meaning there was a 99.87 per cent chance that the asteroid would miss Earth.
"We tend to be a little more conservative but it definitely appears to now have a downward trend in probability," Nasa's planetary defence officer Lindley Johnson told AFP.
New observations often shrink the "uncertainty region" where the asteroid will reach its closest point to Earth, Mr Johnson said.
While Earth is still inside that uncertainty region, the odds temporarily increase until further observations exclude Earth and the probability drops to zero.
If it were to strike Earth in 2046, it would be speeding along at about 15km a second, according to estimations.
There would be an about 70 per cent chance it landed in the Pacific Ocean, but the possible strike zone would also include the US, Australia or South-East Asia, Mr Moissl said.
Experts also emphasised that the world is no longer defenceless against such a threat.
Remarkable images show moment Nasa’s Dart spacecraft smashed into asteroid - in pictures
Last year, Nasa's Dart spacecraft deliberately slammed into the pyramid-sized asteroid Dimorphos, significantly knocking it off course in the first such test of our planetary defences.
Davide Farnocchia at Nasa said the "Dart mission gives us confidence that such a mission would be successful" against 2023 DW, if required.
"Everyone should relax, ignore the sensationalist headlines and stories, and watch how this situation plays out," Mr Johnson said, adding that any threat was likely to "evaporate" soon.
"Nevertheless, the planetary defence community will keep looking up."
Agence France-Presse contributed to this report
What is the definition of an SME?
SMEs in the UAE are defined by the number of employees, annual turnover and sector. For example, a “small company” in the services industry has six to 50 employees with a turnover of more than Dh2 million up to Dh20m, while in the manufacturing industry the requirements are 10 to 100 employees with a turnover of more than Dh3m up to Dh50m, according to Dubai SME, an agency of the Department of Economic Development.
A “medium-sized company” can either have staff of 51 to 200 employees or 101 to 250 employees, and a turnover less than or equal to Dh200m or Dh250m, again depending on whether the business is in the trading, manufacturing or services sectors.
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How to turn your property into a holiday home
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