Asteroid 2024 MK will fly past Earth on 29 June at approximately 13:45 UTC (15:45 CEST). It is between 120 and 260 m across and will pass within the orbit of the moon. Credit: European Space Agency
Two large asteroids will safely pass Earth this week, a rare occurrence perfectly timed to commemorate this year’s Asteroid Day.
Neither poses any risk to our planet, but one of them was only discovered a week ago, highlighting the need to continue improving our ability to detect potentially hazardous objects in our cosmic neighborhood.
2024 MK—less than two weeks between discovery and flyby
Asteroid 2024 MK is between 120 and 260 m in size and was discovered on 16 June 2024. The asteroid will fly past Earth on 29 June during the height of this year’s Asteroid Day activities.
2024 MK is large for a near-Earth object (NEO) and will pass within 290 000 km of Earth’s surface—roughly 75% of the distance between Earth and the moon.
There is no risk of 2024 MK impacting Earth. However, an asteroid this size would cause considerable damage if it did, so its discovery just one week before it flies past our planet highlights the ongoing need to improve our ability to detect and monitor potentially hazardous near-Earth objects (NEOs).
Due to its size and proximity, 2024 MK will be observable in clear dark skies on 29 June using a small telescope or good binoculars for amateur astronomers in some parts of the world. Plan your observations using ESA’s NEO toolkit.
(415029) 2011 UL21—larger than 99% of near-Earth asteroids
Asteroid (415029) 2011 UL21 is the larger of the week’s visitors. At 2310 m across, this asteroid is larger than 99% of all known near-Earth objects (NEOs). However, it won’t come anywhere near as close to Earth. At its closest point on 27 June, it will still be more than 17 times as far away as the moon.
Asteroid (415029) 2011 UL21 will fly past Earth on 27 June, at 20:14 UTC (22:14 CEST). At 2310 m across, it is larger than 99% of all known near-Earth objects (NEOs), but it poses no risk to Earth and will pass by more than 17 times as far away as the moon. Credit: European Space Agency
This asteroid’s orbit around the sun is steeply inclined, which is unusual for such a large object. Most large objects in the solar system, including planets and asteroids, orbit the sun in or close to the equatorial plane.
This could be the result of gravitational interactions with a large planet like Jupiter. Jupiter can deflect previously safe asteroids inwards towards Earth, so understanding this process is important.
(415029) 2011 UL21 is in an ’11:34 resonance’ with Earth. It completes 11 revolutions about the sun in almost the exact same amount of time in which Earth completes 34 revolutions (i.e. 34 years).
The result is a pleasant repeating pattern when you visualize the asteroid’s location relative to Earth over a period of 34 years while keeping Earth fixed in place.
Asteroid Day 2024
The impact craters scarring Earth’s surface are testament to how asteroids have greatly influenced our planet’s history and development.
The UN-endorsed Asteroid Day commemorates the largest observed asteroid strike in recorded history—the 1908 airburst above Tunguska in largely deserted Siberia, which felled around 80 million trees.
This represented a lucky escape for Europe: it happened just a short rotation of Earth away from affecting the continent’s more heavily populated regions.
Asteroid 2024 MK will fly past Earth on 29 June at approximately 13:45 UTC (15:45 CEST). It is between 120 and 270 m across and will pass within the orbit of the moon. Credit: European Space Agency
ESA is in a unique position, with the cooperation and support of its Member States, to coordinate the data, information and expertise needed to understand and respond to asteroid hazards in Europe and participate in humankind’s wider planetary defense efforts.
Over the last two decades, ESA has been performing detection and analysis of potentially hazardous NEOs. There are an estimated 5 million NEOs out there larger than 20 m—the threshold above which an impact could cause damage on the ground.
ESA ramps up asteroid activities
ESA’s Planetary Defense Office is carrying out a number of projects dedicated to improving our ability to detect, track and mitigate potentially hazardous asteroids.
Launching later this year, ESA’s Hera mission is part of the world’s first test of asteroid deflection. Hera will perform a detailed post-impact survey of the asteroid Dimorphos following the impact of NASA’s DART mission in September 2022 and help turn the experiment into a well-understood and repeatable planetary defense technique. Members of the Hera team will take part in Asteroid Day celebrations later this week.
Back on Earth, ESA is developing a network of insect-inspired Flyeye telescopes that will use their uniquely wide field of view to automatically scan the entire sky every night on the hunt for new potentially hazardous asteroids.
Our future NEOMIR satellite will be located between Earth and the sun. It will use infrared light to spot asteroids approaching our planet from regions of the sky which cannot be seen from the ground as they are obscured by the glare of our star.
Meanwhile, the Planetary Defense Office continues to keep a close eye on the sky today. ESA’s fireball camera in Cáceres, Spain, captured a stunning meteor during the night of 18–19 May 2024, which is thought to have been a small piece of a comet that flew over Spain and Portugal traveling at roughly 162,000 km/h before burning up over the Atlantic Ocean.
Just a couple of weeks later, on 6 June 2024, the Catalina Sky Survey in Arizona, U.S. discovered a small asteroid 2–4 m in size that triggered an alert from ESA’s imminent impact monitoring system (Meerkat).
That alert was not for an impact, but for a very close call. A few hours later, the object flew over the Catalina Sky Survey telescope that discovered it at a distance of just 1750 km, making it the second closest pass of a known, non-impacting asteroid ever.
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TEL AVIV, Israel (AP) — A rare Bronze-Era jar accidentally smashed by a 4-year-old visiting a museum was back on display Wednesday after restoration experts were able to carefully piece the artifact back together.
Last month, a family from northern Israel was visiting the museum when their youngest son tipped over the jar, which smashed into pieces.
Alex Geller, the boy’s father, said his son — the youngest of three — is exceptionally curious, and that the moment he heard the crash, “please let that not be my child” was the first thought that raced through his head.
The jar has been on display at the Hecht Museum in Haifa for 35 years. It was one of the only containers of its size and from that period still complete when it was discovered.
The Bronze Age jar is one of many artifacts exhibited out in the open, part of the Hecht Museum’s vision of letting visitors explore history without glass barriers, said Inbal Rivlin, the director of the museum, which is associated with Haifa University in northern Israel.
It was likely used to hold wine or oil, and dates back to between 2200 and 1500 B.C.
Rivlin and the museum decided to turn the moment, which captured international attention, into a teaching moment, inviting the Geller family back for a special visit and hands-on activity to illustrate the restoration process.
Rivlin added that the incident provided a welcome distraction from the ongoing war in Gaza. “Well, he’s just a kid. So I think that somehow it touches the heart of the people in Israel and around the world,“ said Rivlin.
Roee Shafir, a restoration expert at the museum, said the repairs would be fairly simple, as the pieces were from a single, complete jar. Archaeologists often face the more daunting task of sifting through piles of shards from multiple objects and trying to piece them together.
Experts used 3D technology, hi-resolution videos, and special glue to painstakingly reconstruct the large jar.
Less than two weeks after it broke, the jar went back on display at the museum. The gluing process left small hairline cracks, and a few pieces are missing, but the jar’s impressive size remains.
The only noticeable difference in the exhibit was a new sign reading “please don’t touch.”
VICTORIA – The British Columbia government is partnering with a bear welfare group to reduce the number of bears being euthanized in the province.
Nicholas Scapillati, executive director of Grizzly Bear Foundation, said Monday that it comes after months-long discussions with the province on how to protect bears, with the goal to give the animals a “better and second chance at life in the wild.”
Scapillati said what’s exciting about the project is that the government is open to working with outside experts and the public.
“So, they’ll be working through Indigenous knowledge and scientific understanding, bringing in the latest techniques and training expertise from leading experts,” he said in an interview.
B.C. government data show conservation officers destroyed 603 black bears and 23 grizzly bears in 2023, while 154 black bears were killed by officers in the first six months of this year.
Scapillati said the group will publish a report with recommendations by next spring, while an independent oversight committee will be set up to review all bear encounters with conservation officers to provide advice to the government.
Environment Minister George Heyman said in a statement that they are looking for new ways to ensure conservation officers “have the trust of the communities they serve,” and the panel will make recommendations to enhance officer training and improve policies.
Lesley Fox, with the wildlife protection group The Fur-Bearers, said they’ve been calling for such a committee for decades.
“This move demonstrates the government is listening,” said Fox. “I suspect, because of the impending election, their listening skills are potentially a little sharper than they normally are.”
Fox said the partnership came from “a place of long frustration” as provincial conservation officers kill more than 500 black bears every year on average, and the public is “no longer tolerating this kind of approach.”
“I think that the conservation officer service and the B.C. government are aware they need to change, and certainly the public has been asking for it,” said Fox.
Fox said there’s a lot of optimism about the new partnership, but, as with any government, there will likely be a lot of red tape to get through.
“I think speed is going to be important, whether or not the committee has the ability to make change and make change relatively quickly without having to study an issue to death, ” said Fox.
This report by The Canadian Press was first published Sept. 9, 2024.
The European Space Agency is fast-tracking a new mission called Ramses, which will fly to near-Earth asteroid 99942 Apophis and join the space rock in 2029 when it comes very close to our planet — closer even than the region where geosynchronous satellites sit.
Ramses is short for Rapid Apophis Mission for Space Safety and, as its name suggests, is the next phase in humanity’s efforts to learn more about near-Earth asteroids (NEOs) and how we might deflect them should one ever be discovered on a collision course with planet Earth.
In order to launch in time to rendezvous with Apophis in February 2029, scientists at the European Space Agency have been given permission to start planning Ramses even before the multinational space agency officially adopts the mission. The sanctioning and appropriation of funding for the Ramses mission will hopefully take place at ESA’s Ministerial Council meeting (involving representatives from each of ESA’s member states) in November of 2025. To arrive at Apophis in February 2029, launch would have to take place in April 2028, the agency says.
This is a big deal because large asteroids don’t come this close to Earth very often. It is thus scientifically precious that, on April 13, 2029, Apophis will pass within 19,794 miles (31,860 kilometers) of Earth. For comparison, geosynchronous orbit is 22,236 miles (35,786 km) above Earth’s surface. Such close fly-bys by asteroids hundreds of meters across (Apophis is about 1,230 feet, or 375 meters, across) only occur on average once every 5,000 to 10,000 years. Miss this one, and we’ve got a long time to wait for the next.
When Apophis was discovered in 2004, it was for a short time the most dangerous asteroid known, being classified as having the potential to impact with Earth possibly in 2029, 2036, or 2068. Should an asteroid of its size strike Earth, it could gouge out a crater several kilometers across and devastate a country with shock waves, flash heating and earth tremors. If it crashed down in the ocean, it could send a towering tsunami to devastate coastlines in multiple countries.
Over time, as our knowledge of Apophis’ orbit became more refined, however, the risk of impact greatly went down. Radar observations of the asteroid in March of 2021 reduced the uncertainty in Apophis’ orbit from hundreds of kilometers to just a few kilometers, finally removing any lingering worries about an impact — at least for the next 100 years. (Beyond 100 years, asteroid orbits can become too unpredictable to plot with any accuracy, but there’s currently no suggestion that an impact will occur after 100 years.) So, Earth is expected to be perfectly safe in 2029 when Apophis comes through. Still, scientists want to see how Apophis responds by coming so close to Earth and entering our planet’s gravitational field.
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“There is still so much we have yet to learn about asteroids but, until now, we have had to travel deep into the solar system to study them and perform experiments ourselves to interact with their surface,” said Patrick Michel, who is the Director of Research at CNRS at Observatoire de la Côte d’Azur in Nice, France, in a statement. “Nature is bringing one to us and conducting the experiment itself. All we need to do is watch as Apophis is stretched and squeezed by strong tidal forces that may trigger landslides and other disturbances and reveal new material from beneath the surface.”
The Goldstone radar’s imagery of asteroid 99942 Apophis as it made its closest approach to Earth, in March 2021. (Image credit: NASA/JPL–Caltech/NSF/AUI/GBO)
By arriving at Apophis before the asteroid’s close encounter with Earth, and sticking with it throughout the flyby and beyond, Ramses will be in prime position to conduct before-and-after surveys to see how Apophis reacts to Earth. By looking for disturbances Earth’s gravitational tidal forces trigger on the asteroid’s surface, Ramses will be able to learn about Apophis’ internal structure, density, porosity and composition, all of which are characteristics that we would need to first understand before considering how best to deflect a similar asteroid were one ever found to be on a collision course with our world.
Besides assisting in protecting Earth, learning about Apophis will give scientists further insights into how similar asteroids formed in the early solar system, and, in the process, how planets (including Earth) formed out of the same material.
One way we already know Earth will affect Apophis is by changing its orbit. Currently, Apophis is categorized as an Aten-type asteroid, which is what we call the class of near-Earth objects that have a shorter orbit around the sun than Earth does. Apophis currently gets as far as 0.92 astronomical units (137.6 million km, or 85.5 million miles) from the sun. However, our planet will give Apophis a gravitational nudge that will enlarge its orbit to 1.1 astronomical units (164.6 million km, or 102 million miles), such that its orbital period becomes longer than Earth’s.
It will then be classed as an Apollo-type asteroid.
Ramses won’t be alone in tracking Apophis. NASA has repurposed their OSIRIS-REx mission, which returned a sample from another near-Earth asteroid, 101955 Bennu, in 2023. However, the spacecraft, renamed OSIRIS-APEX (Apophis Explorer), won’t arrive at the asteroid until April 23, 2029, ten days after the close encounter with Earth. OSIRIS-APEX will initially perform a flyby of Apophis at a distance of about 2,500 miles (4,000 km) from the object, then return in June that year to settle into orbit around Apophis for an 18-month mission.
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Furthermore, the European Space Agency still plans on launching its Hera spacecraft in October 2024 to follow-up on the DART mission to the double asteroid Didymos and Dimorphos. DART impacted the latter in a test of kinetic impactor capabilities for potentially changing a hazardous asteroid’s orbit around our planet. Hera will survey the binary asteroid system and observe the crater made by DART’s sacrifice to gain a better understanding of Dimorphos’ structure and composition post-impact, so that we can place the results in context.
The more near-Earth asteroids like Dimorphos and Apophis that we study, the greater that context becomes. Perhaps, one day, the understanding that we have gained from these missions will indeed save our planet.
