Asteroid the size of a bus that Nasa only spotted on Christmas Day is set to have a 'near miss' with Earth TODAY as it flies between our planet and the moon at 21,000mph
A newly-found bus-sized asteroid is due to come close to Earth today - at speeds of more than 21,000mph (34,000km/h).
Named 2017 YZ4, the asteroid was only spotted on Christmas Day, which means very little could have been done to protect Earth if it were to hit.
The asteroid will pass between the Earth and moon at a distance of just 139,433 miles (224,000 km) - close enough to be considered a near miss by astronomers.
The potentially hazardous asteroid, which is 22. 6 to 49 feet in diameter (seven to 15 metres) is due to skim past Earth at 4. 56pm GMT (11. 56 ET) this afternoon.
Nasa describes asteroids as hazardous if they come within the 4,600,000 mile (7,403,00km) threshold of proximity to our planet.
A previously unseen asteroid is due to brush past Earth today - at a speed of more than 21,000 miles an hour (34,000kmh) (stock image).
Named 2017 YZ4, the asteroid was only spotted on Christmas Day and will pass between the Earth and moon at a distance of just 139,433 miles (224,000km) - close enough to be considered a near miss by astronomers.
For reference, the distance between the Earth and the moon is 238,855 miles (384,400 km). The small asteroid, which is 22.6 to 49 feet in diameter (seven to 15 metres) is due to skim past Earth at 4.56pm GMT (11.56 ET) this afternoon.
Anything that flies closer than six million miles of our planet is a near earth asteroid and could cause severe damage were it ever to crash into Earth. In February 2013 a 19-metre meter (62-feet) meteor exploded in the skies above Chelyabinsk in Russia.
The energy - which was equivalent to 500,000 tonnes of TNT - and injured more than 1,000 people. .
The asteroid was first spotted at Mount Lemmon Survey Observatory in Arizona and will be the 52nd to pass between Earth and the moon this year.
If it were on a collision course with Earth, Nasa could look at options for deflecting it, or changing the velocity of the object by less than an inch per second years in advance of the predicted impact.
This is the first known asteroid to flyby Earth within one lunar distance since two such asteroids flew past us 35 minutes apart on November 21, and the 52nd this year, a Nasa spokesperson told the Express.
As of December 24, there are 17,495 known Near-Earth Objects (NEOs) around our planet; 17,389 are asteroids.
This year, we discovered 1,985 new near Earth asteroids.
There were 1888 such objects discovered in 2016 and 1,571 in 2015..
Anything that flies closer than six million miles of our planet is a near earth asteroid and could cause severe damage were it ever to crash into Earth.
In February 2013 a 19-metre meter (62-feet) meteor exploded in the skies above Chelyabinsk in Russia.
The energy - which was equivalent to 500,000 tonnes of TNT - and injured more than 1,000 people.
Earlier this month a massive asteroid called 3200 Phaethon made its closest approach to Earth at around 6. 4 million miles (10. 3 million kilometers) away.
The new observations conducted from December 15-19 show Phaethon to be about 3. 6 miles (six kilometres) wide.
Named 2017 YZ4, the asteroid was only spotted on Christmas Day and will pass between the Earth and moon at a distance of just 139,433 miles (224,000km) - close enough to be considered a near miss by astronomers.
The small asteroid, which is 22. 6 to 49 feet in diameter (seven to 15 metres) is due to skim past Earth at 4. 56pm GMT (11. 56 ET) this afternoon.
During a recent pass of another asteroid, Nasa used its international network of observatories to recover, track and characterise asteroid 2012 TC4.
As it started to approach Earth in the coming months, large telescopes were used to detect it and establish the asteroids precise trajectory.
The new observations have helped refine knowledge about its orbit, narrowing the uncertainty about how far it will be from Earth in future passes.
This means its larger than previously thought, by about 0. 6 miles (one kilometre).
It passed by Earth this month at about 27 times the distance between our planet and the moon.
Before its approach, NASA revealed asteroid 3200 Phaethon is classed as potentially hazardous.
The latest approach is the closest the asteroid has been to Earth since December 16, 1974, when it was around 5 million miles away - although we were blissfully unaware at the time.
In a statement about the asteroid, which was first discovered in 1983, a spokesperson for Nasa said: With a diameter of about 5km, Phaethon is the third largest near-Earth asteroid classified as Potentially Hazardous.
The next pass is predicted to be in 2093 when it is expected to pass at just over 1. 8 million miles (2. 9 million kilometres) away.
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