分光を備えた全天の流星時計はありますか?


1

流星を分光分析すると、流星体の外層の組成に関する情報が得られると思います。流星体はすでに燃焼しているため、調査結果については調査できません。これにより、太陽系の小さな天体に関する知識が増えます。

CAMSFRIPONなど、空全体を観測して流星を見つけるプログラムがあります。これらは通常のカメラです。

MUSEのように、空の多くの点を同時に分光できるため、ほとんどの空を継続的に監視して、流星の分光データを取得できます。

これは行われましたか?そうでない場合、なぜですか?

1

You can do this kind of thing reasonably easily, even as amateur astronomer. See e.g. this link. There also have been programmes by the Americal Meteor society and there are a lot of published papers to that end, e.g. here

Two reasons it has not been done more widlely:

It's a difficult and very costly endevour to make high-resolution spectroscopy at very short time intervals - at the time you have for the meteor to show. There is no reasonable technique to justify a setup which points a large telescope within sub-second time to an arbitrary location as identified by a full-dome camera scanning the whole sky - to which you will have to attach the spectrograph.

At the same time there is little reason to believe that the outer material of meteorites which ablates in the upper atmosphere is different to what we find as meteorite on Earth. The surface is altered, and the processes are well-understood. Thermal conductivity and inertia are very small so that below this very shallow crust the material is unaltered. That said, missions like the Apollo missions as well as StarDust and similar did in-situ analysis of interplanetary material which has not been thermally altered in Earth's atmosphere. General statistics on type of meteorites, including their chemical composition and origin can also be done with the finds from Earth's surface.

So in summary: the cost to gain ratio for such endevour might be much smaller than you seem to anticipate.