Talk:5 Astraea

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[edit] Pronunciation

I changed the pronunciation from as-trye'-a. True, <æ> represented [aj] in Latin, but in English it regularly becomes <e> (ee or eh depending), as in encyclopædia. The mythological refs I've checked are universal in giving as-tree'-a.

[edit] Densities

A paper [Krasinsky, Icarus, Vol. 158, p. 98 (2002)] gives recent calculations for the mean densities of C, S, and M class asteroids as 1.38, 2.71, and 5.32 g/cm³. (here "C" included Tholen classes C,D,P,T,B,G, and F), while "S" included Tholen classes S,K,Q,V,R,A,E). Assuming these values (rather than the present ~2 g/cm³) is probably significantly more accurate for the mass of asteroids whose mass has not been otherwise measured, although there is still heaps of variation due to porosity, etc. Deuar 11:39, 16 November 2005 (UTC)

[edit] Dimensions

The Lopez-Gonzales reference (2005) gave diameter ratios a/b=1.35, b/c=1.5, (where the dimensions are a×b×c) from photometry. Combining these with the IRAS mean diameter of d=119.1 km using abc=d³, gives the dimensions 167×123×82 km. Deuar 18:11, 16 November 2005 (UTC)