Program: GN-2017B-DD-8

The discovery of the first known interstellar minor planet, A/2017 U1, was confirmed only two days ago. As it speeds rapidly out of our Solar System, we have a brief window of a few days to characterize its physical properties, providing insight into the composition of planetesimal surfaces that have travelled between stars. We request straightforward grJ photometry, to place A/2017 U1 in context with our comprehensive and established sample of the compositions of trans-Neptunian objects, which have previously been observed in grJ with Gemini North.