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L-type asteroids are relatively uncommonasteroids with a strongly reddish spectrum shortwards of 0.75 μm, and a featureless flat spectrum longwards of this. In comparison with theK-type, they exhibit a more reddish spectrum at visible wavelengths and a flat spectrum in the infrared.
These asteroids were described as "featureless"S-types in theTholen classification. The L-type was formally introduced in theSMASS classification, although previous studies had noted the unusual spectra of two of its members387 Aquitania and980 Anacostia.
There are 41 asteroids classified as L-types in the SMASS taxonomy.[1]
The Ld type is a grouping proposed in the SMASS classification for asteroids with an L-like flat spectrum longwards of 0.75 μm, but even redder in visible wavelengths, like theD-type. An example may be728 Leonisis, although it has also been classified as anA-type.