The asteroid, called 2008 OS7, is expected to come as close as 1.7 million miles to our planet at 14:41 GMT – about seven times further out than the moon.

It is estimated to be up to 1,574 feet (480 metres) in diameter, which is longer than the Tottenham Hotspur stadium (820 feet or 250 metres).

As 2008 OS7 flies past Earth, it will be travelling at a speed of 18.1 km per second or just over 40,000 miles per hour – roughly 50 times the speed of sound.

The asteroid is ‘potentially hazardous’, although thankfully it’s not expected to pose a danger to our planet.

As 2008 OS7 flies past Earth, it will be travelling at a speed of 18.1 km per second or just over 40,000 miles per hour – roughly 50 times the speed of sound (artist’s impression)

This 180-second exposure shot provided by Virtual Telescope Project in Italy shows asteroid 2008 OS7 during its approach of Earth on  January 31, 2024. Astronomers say an asteroid as big as a skyscraper will pass within 1.7 million miles of Earth on Friday. There’s no chance of it hitting us since it will pass seven times the distance from Earth to the moon

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Asteroid 2008 OS7 – discovered in 2008 by the Catalina Sky Survey in Arizona – completes an orbit around the sun every 962 days (2.63 years).

But as it does so, it intersects with Earth’s orbit, according to Dr Minjae Kim, a space expert at the University of Warwick’s astronomy department.

He describes it as ‘very small’ relatively speaking, because the largest known asteroid in the solar system, Ceres, is 580 miles in diameter (more than 3 million feet) – big enough for humans to live on.

‘2008 OS7 – a very small asteroid whose orbit intersects with that of Earth – has been classified as a “potentially hazardous asteroid”,’ said Dr Kim.

‘While this will still approach close to the Earth, we don’t need to worry about it too much as this asteroid will not enter Earth’s atmosphere.

‘One of the most intriguing aspects of the 2008 OS7 is its estimated diameter based on its luminosity and reflective properties.

‘This places it in the category of a small to moderately-sized asteroid, roughly equivalent to the size of a football field.’

According to NASA, the asteroid is 210 to 480 metres (688 to 1,574 feet) in diameter.

Pictured is the asteroid’s orbital path in white as well as the orbits of Earth (blue), Mars (red), Venus (purple) and Mercury (pink)

It is estimated to be up to 1,574 feet (480 metres) in diameter, which is longer than the Tottenham Hotspur stadium (820 feet or 250 metres, pictured)

What is a near-Earth orbit?

A near-Earth object (NEO) is a space rock – usually an asteroid – that passes close to the Earth.

A NEO is defined as such when it comes within 1.3 astronomical units (AU) (120.8million miles) of the sun and hence within 0.3 AU (27.8million miles) of Earth’s orbit.

Almost all NEOs are near-Earth asteroids (NEAs), although there are such things as near-Earth comets (NECs) too.

Unfortunately, this asteroid will be too small to be seen by the naked eye, or even with an average telescope.

NASA lists 2008 OS7 as one of the upcoming close approaches on its online tracker, which compiles upcoming objects that are getting closer and closer to Earth.

An asteroid is defined as ‘potentially hazardous’ if it comes within 0.05 astronomical units (4.65million miles) of Earth and is larger than 459 feet (140 meters) in diameter.

Despite being seven times further out than the moon when it makes its close approach, the asteroid is classed as a near-Earth object (NEO) and is being tracked by the space agency.

‘NEOs are comets and asteroids that have been nudged by the gravitational attraction of nearby planets into orbits that allow them to enter the Earth’s neighbourhood,’ said NASA.

‘Composed mostly of water ice with embedded dust particles, comets originally formed in the cold outer planetary system while most of the rocky asteroids formed in the warmer inner solar system between the orbits of Mars and Jupiter.

‘The scientific interest in comets and asteroids is due largely to their status as the relatively unchanged remnant debris from the solar system formation process some 4.6 billion years ago.’

On average, Earth is hit by a football pitch-sized rock every 5,000 years, and a civilisation-ending asteroid every one million years, according to NASA’s Near-Earth Object Program.

Asteroid 2008 OS7 won’t be back our way again until 2032, but it will be a much more distant encounter, staying 45 million miles (72 million kilometers) away.

DIFFERENT TYPES OF SPACE ROCKS

An asteroid is a large chunk of rock left over from collisions or the early Solar System. Most are located between Mars and Jupiter in the Main Belt.

A comet is a rock covered in ice, methane and other compounds. Their orbits take them much further out of the Solar System.

A meteor is what astronomers call a flash of light in the atmosphere when debris burns up.

This debris itself is known as a meteoroid. Most are so small they are vapourised in the atmosphere.

If any of this meteoroid makes it to Earth, it is called a meteorite.

Meteors, meteoroids and meteorites normally originate from asteroids and comets.