The puzzling case of the Nysa-Polana family finally solved ?

Details The puzzling case of the Nysa-Polana family finally solved ? The puzzling case of the Nysa-Polana family finally solved ?

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dps....30.0505d&link_type=abstract

American Astronomical Society, DPS meeting #30, #05.05; Bulletin of the American Astronomical Society, Vol. 30, p.1022

Mathematics

Logic

Scientific paper

We present some preliminary results of a systematic observational campaign devoted to a mineralogical characterization of the Nysa family. According to Zappala et al. 1995 (Icarus 116, 291-314) this family is peculiar, since it splits into two major subclusters (The Nysa and the Polana sub-groups) just below the critical distance level used to define families in this region of the belt. The difficulty in assessing whether the Nysa family can be considered as a unique group or as the result of the merging of two independent families, has long prevented from undertaking systematic physical analyses of this important family. Moreover, it is known that in the region of the belt surrounding the family, there is an unusual concentration of F-type asteroids. Some of them are included into the list of nominal Nysa members, while some others apparently do not belong to the family. So far, we have observed spectroscopically 21 Nysa members. According to the obtained spectra, it seems that the Nysa and Polana subgroups are mineralogically well distinct. In particular, members of the Nysa subgroup tend to be S-type objects (with the exceptions of Nysa itself, an E-type object, and Hertha, an M-type asteroid), whereas the Polana subgroup is mostly composed of F-type objects. The implications of these results are discussed.

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