Tuesday, November 24, 2020
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An Asteroid Trailing After Mars Might Really Be The Stolen Twin of Our Moon

A distant asteroid trailing within the gravitational wake of Mars has been noticed in larger element than ever earlier than, and the close-up reveals a stunning resemblance – one which raises some fascinating questions in regards to the object’s historic origins.


The asteroid in query, known as (101429) 1998 VF31, is a part of a bunch of trojan asteroids sharing the orbit of Mars.

Trojans are celestial our bodies that fall into gravitationally balanced areas of area within the neighborhood of different planets, positioned 60 levels in entrance of and behind the planet.

Many of the trojan asteroids we learn about share Jupiter’s orbit, however different planets have them too, together with Mars and Earth too.

What makes (101429) 1998 VF31 (hereafter ‘101429’) fascinating is that among the many Pink Planet’s trailing trojans (those that comply with behind Mars because it orbits the Solar), 101429 seems to be distinctive.

010 moon asteroid 2Depiction of Mars and trojans; 101429 is the blue level circling L5. (AOP)

The remainder of the group, known as the L5 Martian Trojans, all belong to what’s often called the Eureka household, consisting of 5261 Eureka – the primary Mars trojan found – and a bunch of small fragments believed to have come free from their dad or mum area rock.

101429 is totally different, although, and in a new research led by astronomers from the Armagh Observatory and Planetarium (AOP) in Northern Eire, researchers needed to look at why.


Utilizing a spectrograph known as X-SHOOTER on the European Southern Observatory’s 8-m Very Massive Telescope (VLT) in Chile, the crew examined how daylight displays off 101429 and its L5 kin within the Eureka household. Solely, it appears to be like like 101429 and the Eureka clan aren’t kin in spite of everything, with the evaluation revealing 101429 reveals a spectral match for a satellite tv for pc a lot nearer to dwelling.

“The spectrum of this explicit asteroid appears to be virtually a dead-ringer for elements of the Moon the place there’s uncovered bedrock akin to crater interiors and mountains,” explains AOP astrochemist Galin Borisov.

Whereas we will not be certain but why that’s, the researchers say it is believable that this Martian trojan’s origins started someplace far faraway from the Pink Planet, with 101429 representing a “relic fragment of the Moon’s authentic stable crust”.

If that is true, how did the Moon’s long-lost twin find yourself as a trojan sure along with Mars?

010 moon asteroid 2Spectral comparability of 101429 and the Moon’s floor. (AOP)

“The early Photo voltaic System was very totally different from the place we see right now,” explains lead writer of the research, AOP astronomer Apostolos Christou.

“The area between the newly-formed planets was stuffed with particles and collisions had been commonplace. Massive asteroids [planetesimals] had been continually hitting the Moon and the opposite planets. A shard from such a collision may have reached the orbit of Mars when the planet was nonetheless forming and was trapped in its Trojan clouds.”


It is a fascinating concept, however the researchers say it is not the one clarification for 101429’s previous. It is also doable, and maybe extra probably, that the trojan as a substitute represents a fraction of Mars chipped off by the same sort of incident impacting the Pink Planet; or it’d simply be a commonplace asteroid that, by way of the weathering processes of photo voltaic radiation, ended up trying similar to the Moon.

Additional observations with much more highly effective spectrographs would possibly be capable of shed extra mild on this query of area parentage, as may a future spacecraft go to, the crew says, “which may, en path to the Trojans, receive spectra at Mars or the Moon for direct comparability with the asteroid knowledge”.

The findings are reported in Icarus.


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