Science And Space

An Asteroid Trailing After Mars Could Actually Be The Stolen Twin of Our Moon


A distant asteroid trailing within the gravitational wake of Mars has been noticed in better element than ever earlier than, and the close-up reveals a stunning resemblance – one which raises some fascinating questions concerning 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 bodies that fall into gravitationally balanced areas of house within the neighborhood of different planets, situated 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, including Mars and Earth too.

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

Depiction 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 known as the Eureka household, consisting of 5261 Eureka – the primary Mars trojan found – and a bunch of small fragments believed to have come unfastened from their mum or dad house rock.

101429 is totally different, although, and in a new study 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 seems to be 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 residence.

“The spectrum of this explicit asteroid appears to be nearly a dead-ringer for elements of the Moon the place there’s uncovered bedrock corresponding 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 Purple Planet, with 101429 representing a “relic fragment of the Moon’s unique strong 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 examine, AOP astronomer Apostolos Christou.

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


It is a charming concept, however the researchers say it isn’t the one rationalization for 101429’s previous. It is also doable, and maybe extra possible, that the trojan as a substitute represents a fraction of Mars chipped off by the same type of incident impacting the Purple Planet; or it’d simply be a commonplace asteroid that, by means of the weathering processes of photo voltaic radiation, ended up wanting identical to the Moon.

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

The findings are reported in Icarus.


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