Dangerous asteroid approaching Earth

The riskiest asteroid known to mankind in the past year won’t hit Earth for at least 100 years

Dangerous asteroid approaching Earth

Asteroid ‘2021 QM1’ has been officially removed from the ESA’s asteroid risk list. There are still 1,377 asteroids left. (Artist’s impression of an asteroid hurtling towards Earth.)

Impact in 2052 ruled out as European Space Agency (ESA) counts down to Asteroid Day

Just in time for World Asteroid Day: A menacing space rock has topped hazard lists around the world for months, with a real chance of hitting Earth on April 2, 2052. Today the team of asteroids working with experts from the European Southern Observatory ([{” attribute=””>ESO) has officially removed ‘2021 QM1’ from their asteroid risk list, a result of skilled observations and analysis of the faintest asteroid ever observed with one of the most sensitive telescopes ever constructed.

With Asteroid Day Live 2022 set for June 30, we can safely say that the riskiest asteroid known to humankind in the last year will not impact the Earth – at least not for the next century.

What was it like to track this asteroid? Get the full story in ESA’s fascinating behind-the-scenes look at how European experts handle asteroid risks in the official countdown to Asteroid Day live on June 30, airing at 10:25 CEST on AsteroidDay.org and via ESA WebTV.

Stars Hide Once-Risky Asteroid 2021 QM1

Asteroid 2021 QM1, once thought to have a chance of impacting Earth in 2052, was spotted passing through a region of the sky with the Milky Way just behind it. The small, faint, receding asteroid had to be found against a backdrop of thousands of stars, with red crosses indicating the path of the object. Credit: ESO/O. Hainaut

Impact 2052

2021 QM1 was first discovered on August 28, 2021, by the Mount Lemmon Observatory, located north of Tucson, Arizona. At the beginning, nothing stood out as unusual about the discovery – about a dozen new near-Earth asteroids are identified every dark night. Routine follow-up observations were subsequently acquired from telescopes around the globe, but these began to tell a more worrying story.

“These early observations gave us more information about the asteroid’s path, which we then projected into the future,” said Richard Moissl, ESA’s Head of Planetary Defense.

“We could see its future paths around the Sun, and in 2052 it could come dangerously close to Earth. The more the asteroid was observed, the greater that risk became.”

It is important to note that orbit calculations based on only a few nights of observations are subject to some uncertainty, which is why asteroids are often added to the ESA’s risk list soon after their discovery. and are then deleted once new data is collected, the uncertainties diminish, and the asteroid is proven to be safe. On this occasion, it was not possible.

Unhappy Cosmic Alignment

As the risk seemed to increase, an (im)perfect cosmic alignment occurred: the asteroid’s trajectory brought it closer to the Sun as seen from Earth, and for months it became impossible to see due to the brilliant brilliance of our host star.

Orbit of asteroid 2021 QM1

The orbit of 2021 QM1 as it approached the Sun in the sky as seen from Earth, shortly after its discovery. Credit: ESA

“We just had to wait,” explained Marco Micheli, an astronomer at ESA’s Near-Earth Object Coordination Center (NEOCC).

“But to top it off, we knew that 2021 QM1 was also moving away from Earth in its current orbit – meaning that by the time it emerges from the Sun’s glare, it might be too faint to detect. “

While they waited, they got ready.

Priority access to one of the most powerful telescopes on Earth

The European Southern Observatory’s Very Large Telescope (VLT) was primed and ready. As soon as the 50-meter asteroid emerges from sunlight – and if and when weather conditions permit – ESO’s VLT will focus its 8m mirror on the vanishing rock.

Spectacular moonset behind ESO's Very Large Telescope

Dramatic sunset behind ESO’s Very Large Telescope (VLT), Chile. As the full Moon sets, the Sun is about to rise on the opposite horizon. The Very Large Telescope (VLT) has already closed its eyes after a long night of observations, and telescope operators and astronomers are sleeping as technicians, engineers and daytime astronomers wake up for another day of work. Operations never stop at the most productive ground-based astronomical observatory in the world. Credit: G.Gillet/ESO

“We had a brief window to spot our risky asteroid,” explained ESO astronomer Olivier Hainaut.

“To make matters worse, he was crossing a region of the sky with the[{” attribute=””>Milky Way just behind. Our small, faint, receding asteroid would have to be found against a backdrop of thousands of stars. These would turn out to be some of the trickiest asteroid observations we have ever made”.

Faintest asteroid ever observed

Over the night of May 24, ESO’s VLT took a series of new images. The data arrived and Olivier and Marco began to process them, stacking subsequent observations on top of each other and removing the background stars: it took some time.

VLT Asteroid 2021 QM1

ESO’s Very Large Telescope captures 2021 QM1 which for months topped risk lists around the globe. This pivotal sighting ruled out Earth impact in the year 2052. Over the night of May 24, the European Southern Observatory’s Very Large Telescope took a series of images of an asteroid that had topped risk lists around the globe for months. These images were some of the trickiest asteroid experts had taken, as the faint asteroid 2021 QM1 receded from view against a very starry backdrop. A series of images were processed, stacked on top of each other and stars were removed, revealing the faintest asteroid observed. Credit: ESA

The result? A positive detection of the faintest asteroid ever observed. With a magnitude of 27 on the scale used by astronomers to describe the brightness of objects in the sky, 2021 QM1 was 250 million times fainter than the faintest stars visible to the naked eye from a dark spot. (In this astronomical scale of visible magnitudes, the brighter an object appears the lower the value of its magnitude, while the brightest objects reach negative values, e.g. the Sun is magnitude -27).

Olivier was certain this small blur was in fact an asteroid, and Marco was certain that given its location, it was our asteroid.

Safe at last?

With these new observations, our risky asteroid’s path was refined, ruling out an impact in 2052, and 2021 QM1 was removed from ESA’s risk list. Another 1,377 remain.

Asteroids June 2022 With Gaia

The position of each asteroid at 12:00 CEST on June 13, 2022, is plotted. Each asteroid is a segment representing its motion over 10 days. Inner bodies move faster around the Sun (yellow circle at the center). Blue represents the inner part of the Solar System, where the Near Earth Asteroids, Mars crossers, and terrestrial planets are. The Main Belt, between Mars and Jupiter, is green. The two orange ‘clouds’ correspond to the Trojan asteroids of Jupiter. Credit: © ESA/Gaia/DPAC; CC BY-SA 3.0 IGO, Acknowledgments: P. Tanga (Observatoire de la Côte d’Azur)

More than one million asteroids have been discovered in the Solar System, almost 30 000 of which pass near Earth, with many more expected to be out there. ESA’s Planetary Defence Office, NEOCC and astronomers around the globe are looking up to keep us safe, working together to ensure we know well in advance if an asteroid is discovered on a collision course.

Watch Asteroid Day Live

How worried are the world’s asteroid experts? How did it feel to track humankind’s most risky asteroid? Get the full story in ESA’s 30-minute program counting down to Asteroid Day live on June 30, airing at 10:25 CEST on AsteroidDay.org and on ESA WebTV.

Tunguska Devastation

Fallen trees at Tunguska, Imperial Russia, seen in 1929, 15 km from epicenter of the aerial blast site, caused by the explosion of a meteor in 1908. Credit: Photo N. A. Setrukov, 1928

Asteroid Day is the United Nations-sanctioned day of public awareness of the risks of asteroid impacts, held annually on June 30. This year sees its return to Luxembourg for an in-person event following two years of living entirely in the virtual realm. Asteroid experts from ESA, from across Europe and worldwide will converge on the city to take part in a packed four-hour live program of panels and one-on-one interviews.

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