Appraisal
These classification schemes are expected to be refined and/or replaced as further research progresses. However for now the spectral classification based on the two above coarse resolution spectroscopic surveys from the 1990s is still the standard. Scientists have been unable to agree on a better taxonomic system, largely due to the difficulty of obtaining detailed measurements consistently for a large sample of asteroids (e.g. finer resolution spectra, or non-spectral data such as densities would be very useful).
Some groupings of asteroids have been correlated with meteorite types:
- C-type - Carbonaceous chondrite meteorites
- S-type - Stony meteorites
- M-type - Iron meteorites
- V-type - HED meteorites
Read more about this topic: Asteroid Spectral Types
Famous quotes containing the word appraisal:
“When one cannot appraise out of one’s own experience, the temptation to blunder is minimized, but even when one can, appraisal seems chiefly useful as appraisal of the appraiser.”
—Marianne Moore (1887–1972)
“Do your children view themselves as successes or failures? Are they being encouraged to be inquisitive or passive? Are they afraid to challenge authority and to question assumptions? Do they feel comfortable adapting to change? Are they easily discouraged if they cannot arrive at a solution to a problem? The answers to those questions will give you a better appraisal of their education than any list of courses, grades, or test scores.”
—Lawrence Kutner (20th century)