2014A&A...567L...7N

In this paper we report near-infrared spectroscopic observations of one of the largest potentially hazardous asteroids, (214869) 2007PA8. Mineralogical analysis of this object was followed by the investigation of the dynamical delivery mechanism from its probable source region, based on long-term numerical integrations. The spectrum of (214869) 2007PA8 was analysed using the positions of 1µm and 2µm bands and by curve-matching with RELAB meteorites spectra. Its dynamical evolution was investigated by means of a 200000-year numerical integration in the past of 1275 clones followed to the source region. (214869) 2007PA8 has a very young surface with a composition more akin to H chondrites than to any other type of ordinary chondrite. It arrived from the outer Main Belt in the near-Earth space via the 5:2 mean motion resonance with Jupiter by eccentricity pumping. Identification of its source region far from (6) Hebe raises the possibility of the existence of a second parent body of the H chondrites that has a radically different post-accretion history. Future spectroscopic surveys in the 5:2 resonance region will most likely discover other asteroids with an H chondrite composition.