  Bottke et al. (2007) linked the catastrophic formation of Baptistina Asteroid
Family (BAF) to the K/T impact event. This linkage was based on dynamical and
compositional evidence, which suggested the impactor had a composition similar
to CM2 carbonaceous chondrites. However, our recent study (Reddy et al. 2009)
suggests that the composition of (298) Baptistina is similar to LL-type
ordinary chondrites rather than CM2 carbonaceous chondrites. This rules out any
possibility of it being related to the source of the K/T impactor, if the
impactor was of CM-type composition. Mineralogical study of asteroids in the
vicinity of BAF has revealed a plethora of compositional types suggesting a
complex formation and evolution environment. A detailed compositional analysis
of 16 asteroids suggests several distinct surface assemblages including
ordinary chondrites (Gaffey SIV subtype), primitive achondrites (Gaffey SIII
subtype), basaltic achondrites (Gaffey SVII subtype and V-type), and a
carbonaceous chondrite. Based on our mineralogical analysis we conclude that
(298) Baptistina is similar to ordinary chondrites (LL-type) based on olivine
and pyroxene mineralogy and moderate albedo. S-type and V-type in and around
the vicinity of BAF we characterized show mineralogical affinity to (8) Flora
and (4) Vesta and could be part of their families. Smaller BAF asteroids with
lower SNR spectra showing only a 'single' band are compositionally similar to
(298) Baptistina and L/LL chondrites. It is unclear at this point why the
silicate absorption bands in spectra of asteroids with formal family definition
seem suppressed relative to background population, despite having similar
mineralogy.
