2024-05-17 22:47:00
[서울신문 나우뉴스]Tiny area rocks from a primitive household of asteroids which might be as soon as thought to have introduced water to Earth present a window into the historical past of the formation of the photo voltaic system.
Life within the photo voltaic system might be uncovered to many dangers. Certainly, many conflicts have taken place all through historical past. For instance, contemplate the large affect that shaped the Moon or the numerous affect occasions that coated Mercury’s floor with quite a few craters. Massive asteroids within the asteroid belt between Mars and Jupiter have additionally collided once in a while.
When this occurs, the asteroid breaks into smaller items. An occasion like this might produce dozens of small area rocks. Naturally, many rock fragments from the identical authentic object have in frequent that they observe comparable trajectories. Astronomers name this group of asteroids an “asteroid household.”
It’s recognized that there are greater than 120 “asteroid households” within the asteroid belt. Some, just like the Vesta collection, named following 4 Vesta, the second largest object within the belt, present proof of chemical modifications. Vesta, which was too giant, underwent a means of heating and differentiation. By means of this course of, heavier components sank into the core, forming numerous layers, which have been then partially damaged aside when struck by one other asteroid.
Nevertheless, eight members of the asteroid household hold their chemistry intact. Astronomers are very inquisitive regarding these pristine samples, as a result of their pristine composition may present new details regarding the state of our photo voltaic system on the time of the formation of the ancestral asteroids of this asteroid household. They can assist us unlock the secrets and techniques of the traditional photo voltaic system.
Because of this, Noemi Pinilla-Alonso, a planetary scientist on the College of Central Florida, is co-leading a undertaking known as Primordial Asteroid Spectroscopic Survey (PRIMASS) to file the chemical composition of this group of asteroids.
The work was not too long ago accomplished due to Brittany Harbison, Finilla-Alonso’s doctoral pupil. He was tasked with learning infrared observations of the Erigone proto-asteroids, the newest asteroids studied for the PRIMASS undertaking. The Erigone are a reasonably younger household, because the collision that created them is estimated to have occurred solely 130 million years in the past.
“There’s a principle that Earth might have acquired a few of its water from primordial asteroids early within the photo voltaic system,” Harbison stated in a press release. “An enormous a part of this principle is knowing how these primordial asteroids have been transported into Earth’s path. “So exploring pristine asteroids in our photo voltaic system immediately can assist us construct an image of what that occurred prior to now.”
Harbison used near-infrared observations from NASA’s 3.2-meter aperture infrared telescope in Hawaii and the three.6-meter aperture Telescopio Nazionale Galileo (TNG) on the Roque de los Muchachos Observatory within the Canary Islands, Spain. evaluation. The group owes its title to its largest member, the 72 km lengthy asteroid 163 Erigone.
Harbison discovered that 43% of the Erigone household, together with 163 Erigone, have been C-type carbonaceous asteroids. This implies it’s wealthy in carbon. It isn’t shocking that many members of the Erigone collection are C-type asteroids.
Certainly, they’re typically the most typical sort of asteroid, usually containing traces of hydrated or water-containing minerals. Subsequently, C-type asteroids are good candidates able to offering water to Earth.
As for the remainder of the Erigone group, 28% are X-type asteroids, that are doubtless one other sort with an identical spectrum to the remainder of the group. Kind B, a variant of carbonaceous asteroids, makes up 11% of the Erigone household, and the unknown sort T makes up 7%. There are additionally the stony L and S varieties, which look like non-primitive intruders slightly than true relations. However Harbison’s most important discovery is that members of the Erigone household all share an identical fundamental composition that isn’t repeated in different primitive asteroid households. The truth is, every asteroid household has totally different ranges of hydration. With the ability to match the asteroid with the very best water content material will assist level astronomers in the correct path as they seek for the “wrongdoer” that introduced water to Earth.
Erigones are so aquatic that they’re now a significant goal for astronomers. Coincidentally, NASA’s Lucy area mission heading to Jupiter’s Trojan asteroid will first go to asteroid 52246 Donald Johansson, which has a diameter of 4 km.
This asteroid is positioned in Troy County and is believed to have shaped 1.3 million years in the past. Named following an American paleontologist, this C-type asteroid belongs to the Erigone household. Scientists due to this fact imagine that we will observe Lucy up shut throughout her passage on April 20, 2025.
The PRIMASS workforce additionally efficiently noticed Erigone (and different proto-asteroids) with the James Webb House Telescope beginning this summer time. JWST and LUCY’s discoveries will go a great distance towards uncovering the historical past of those historical objects and filling gaps in our data of the photo voltaic system and Earth’s previous.
Harbison’s analysis was revealed within the April 2024 situation of the journal “Icarus.”
Gwangsik Lee, science columnist joand999@naver.com
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