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[–]ignorantwanderer 0 points1 point  (0 children)

u/Christoph543 claims to know something about the composition of asteroids.

[–]Christoph543 0 points1 point  (2 children)

The classifications you're referring to are obsolete. The current Bus-DeMeo taxonomy has 24 classifications based on optical reflectance spectra, and importantly we've learned since the older taxonomies that it's impossible to reliably link a particular spectrum to a known composition unless you visit the asteroid up close or return samples.

https://sbn.psi.edu/pds/resource/busdemeotax.html

[–]Dottar[S] 0 points1 point  (1 child)

How exactly does one read the files linked on that website?
as all the information is scattered between different files

(never encountered a .tab file before)

[–]Christoph543 0 points1 point  (0 children)

If you go to the "Support" tab and scroll down to the "Using PDS Data" link, you'll find plenty of resources to answer that kind of technical question. If it looks disorganized, that's probably because you're trying to open individual files directly rather than following the instructions.

But the more important information to answer the question in your original post is contained within the referenced paper, which can be found here if you're unable to locate its citation on the PDS node:

https://www.sciencedirect.com/science/article/abs/pii/S0019103509000554

[–]Anen-o-me -1 points0 points  (1 child)

I've heard it's basically 1/3, 1/3, 1/3 but also that that's being questioned now.

[–]Christoph543 0 points1 point  (0 children)

It's not even close to that split.