Home Science An Asteroid Trailing After Mars May Truly Be The Stolen Twin of...

An Asteroid Trailing After Mars May Truly 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 shocking resemblance – one which raises some fascinating questions in regards to the object’s historical origins.


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

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

A lot of the trojan asteroids we find out 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 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, referred to 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 free from their mum or dad area 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 referred to as X-SHOOTER on the European Southern Observatory’s 8-m Very Massive Telescope (VLT) in Chile, the workforce examined how daylight displays off 101429 and its L5 kin within the Eureka household. Solely, it seems like 101429 and the Eureka clan aren’t kin in any case, with the evaluation revealing 101429 reveals a spectral match for a satellite tv for pc a lot nearer to residence.

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

Whereas we won’t make sure 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 certain 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 in the present day,” 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 continuously 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 attainable, and maybe extra possible, that the trojan as a substitute represents a fraction of Mars chipped off by an identical type of incident impacting the Pink Planet; or it’d simply be a commonplace asteroid that, by the weathering processes of photo voltaic radiation, ended up wanting similar to the Moon.

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

The findings are reported in Icarus.



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