Title: Palomar Optical Spectrum of Hyperbolic Near-Earth Object A/2017 U1,
Abstract: We present optical spectroscopy of the recently discovered hyperbolic
near-Earth object A/2017 U1, taken on 25 Oct 2017 at Palomar Observatory.
Although our data are at a very low signal-to-noise, they indicate a very red
surface at optical wavelengths without significant absorption features.