Earth's new mini-moon swings by, then ghosts us by late November
(2024/10/01)
- Reference: 1727771413
- News link: https://www.theregister.co.uk/2024/10/01/earth_minimoon_2024/
- Source link:
Everybody be on their best behavior: Earth has a visitor. 2024 PT 5 is an asteroid that took up residence in orbit on Sunday to become a "mini-moon."
Alas, even if humanity could clean up our space junk, the asteroid would not be staying with us. It's lingering in the neighborhood until November 25, when the forces of gravity will coax it back into a heliocentric trajectory.
2024 PT 5 , which measures about ten meters across, was first spotted by the Asteroid Terrestrial-impact Last Alert System (ATLAS) on August 7 – not an overly reassuring time period for space objects that are about to thread the needle between Earth and the Moon.
[1]
In any case, an asteroid of this size would likely explode harmlessly in the upper atmosphere. Not that 2024 PT 5 will be coming close enough, as an amateur astronomer's [2]simulation of its trajectory details.
[3]
[4]
A [5]paper on the find, published in Research Notes of the American Astronomical Society and titled "A Two-month Mini-moon," describes the object as "following a horseshoe path" and notes that its "geocentric energy will remain negative for 56.6 days due to a temporarily captured flyby."
The researchers observed that it has orbital elements "consistent with those of the Arjunas" – a group of near-Earth objects (NEOs) that have low eccentricity, low inclination, and orbital periods close to one year.
[6]Scientists demonstrate X-rays as a way to zap asteroids out of Earth's path
[7]NASA's NEOWISE asteroid spotter turned off for the final time
[8]ESA starts work on planetary defence mission, because Bruce Willis is retired
[9]NASA finds humanity would totally fumble asteroid defense
Backyard astronomers hoping to catch a glimpse of 2024 PT 5 will be disappointed, however. Because of its dimness and size, you have no chance of seeing 2024 PT 5 with the naked eye or even a home telescope – you'd need professional grade kit.
Fear not – mini-moons are not as rare an occurrence as readers may think. The paper references 2022 NX 1 , for instance, which whizzed around Earth in 1981, 2022, and will be back in 2051. Likewise, researchers predict 2024 PT 5 will also be repeating its visit in 2055. Many more mini-moons go completely unnoticed.
[10]
For those hoping for asteroids of the more world-ending variety, we have bad news. Last year, The Register reported how scientists claimed to have [11]mapped out NEO movements up to a millennium from now , and none of them lead to a collision.
The closest we'll get is [12]1994 PC 1 , which is about 1 km across and will have a close encounter with Earth in [13]2525 , but with only a 0.00151 percent chance of passing inside the orbit of the Moon – still a ten times higher risk than any other asteroid in the neighborhood.
But never say never. ®
Get our [14]Tech Resources
[1] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=2&c=2ZvvIR477hnC44ZsdTeYjtAAAANU&t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0
[2] https://x.com/tony873004/status/1833588006353310110
[3] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44ZvvIR477hnC44ZsdTeYjtAAAANU&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0
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[5] https://iopscience.iop.org/article/10.3847/2515-5172/ad781f
[6] https://www.theregister.com/2024/09/24/asteroid_zapping_x_ray_pulse/
[7] https://www.theregister.com/2024/08/09/nasas_asteroid_spotter_turned_off/
[8] https://www.theregister.com/2024/07/17/esa_ramses_prelim_approval/
[9] https://www.theregister.com/2024/06/21/nasa_asteroid_defence/
[10] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44ZvvIR477hnC44ZsdTeYjtAAAANU&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0
[11] https://www.theregister.com/2023/05/17/no_earth_killing_asteroids/
[12] https://en.wikipedia.org/wiki/(7482)_1994_PC1
[13] https://youtu.be/izQB2-Kmiic?si=zXTWkO67m7cq-6d5
[14] https://whitepapers.theregister.com/
Alas, even if humanity could clean up our space junk, the asteroid would not be staying with us. It's lingering in the neighborhood until November 25, when the forces of gravity will coax it back into a heliocentric trajectory.
2024 PT 5 , which measures about ten meters across, was first spotted by the Asteroid Terrestrial-impact Last Alert System (ATLAS) on August 7 – not an overly reassuring time period for space objects that are about to thread the needle between Earth and the Moon.
[1]
In any case, an asteroid of this size would likely explode harmlessly in the upper atmosphere. Not that 2024 PT 5 will be coming close enough, as an amateur astronomer's [2]simulation of its trajectory details.
[3]
[4]
A [5]paper on the find, published in Research Notes of the American Astronomical Society and titled "A Two-month Mini-moon," describes the object as "following a horseshoe path" and notes that its "geocentric energy will remain negative for 56.6 days due to a temporarily captured flyby."
The researchers observed that it has orbital elements "consistent with those of the Arjunas" – a group of near-Earth objects (NEOs) that have low eccentricity, low inclination, and orbital periods close to one year.
[6]Scientists demonstrate X-rays as a way to zap asteroids out of Earth's path
[7]NASA's NEOWISE asteroid spotter turned off for the final time
[8]ESA starts work on planetary defence mission, because Bruce Willis is retired
[9]NASA finds humanity would totally fumble asteroid defense
Backyard astronomers hoping to catch a glimpse of 2024 PT 5 will be disappointed, however. Because of its dimness and size, you have no chance of seeing 2024 PT 5 with the naked eye or even a home telescope – you'd need professional grade kit.
Fear not – mini-moons are not as rare an occurrence as readers may think. The paper references 2022 NX 1 , for instance, which whizzed around Earth in 1981, 2022, and will be back in 2051. Likewise, researchers predict 2024 PT 5 will also be repeating its visit in 2055. Many more mini-moons go completely unnoticed.
[10]
For those hoping for asteroids of the more world-ending variety, we have bad news. Last year, The Register reported how scientists claimed to have [11]mapped out NEO movements up to a millennium from now , and none of them lead to a collision.
The closest we'll get is [12]1994 PC 1 , which is about 1 km across and will have a close encounter with Earth in [13]2525 , but with only a 0.00151 percent chance of passing inside the orbit of the Moon – still a ten times higher risk than any other asteroid in the neighborhood.
But never say never. ®
Get our [14]Tech Resources
[1] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=2&c=2ZvvIR477hnC44ZsdTeYjtAAAANU&t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0
[2] https://x.com/tony873004/status/1833588006353310110
[3] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44ZvvIR477hnC44ZsdTeYjtAAAANU&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0
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[5] https://iopscience.iop.org/article/10.3847/2515-5172/ad781f
[6] https://www.theregister.com/2024/09/24/asteroid_zapping_x_ray_pulse/
[7] https://www.theregister.com/2024/08/09/nasas_asteroid_spotter_turned_off/
[8] https://www.theregister.com/2024/07/17/esa_ramses_prelim_approval/
[9] https://www.theregister.com/2024/06/21/nasa_asteroid_defence/
[10] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44ZvvIR477hnC44ZsdTeYjtAAAANU&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0
[11] https://www.theregister.com/2023/05/17/no_earth_killing_asteroids/
[12] https://en.wikipedia.org/wiki/(7482)_1994_PC1
[13] https://youtu.be/izQB2-Kmiic?si=zXTWkO67m7cq-6d5
[14] https://whitepapers.theregister.com/
Thread the needle?
IF one were a galactic megalomaniac one could line up all the planets, side by side, between the earth and the moon 1 without the aid of Gru's shrink ray gun. Its quite a big eye in that there needle!
1 Only if the moon is at its furthest away from Earth and the planets are squeezed in narrow sides touching... don't get technical it spoils the story!