  We observed the newly discovered hyperbolic minor planet 1I/`Oumuamua (2017
U1) on 2017 October 30 with Lowell Observatory's 4.3-m Discovery Channel
Telescope. From these observations, we derived a partial lightcurve with
peak-to-trough amplitude of at least 1.2 mag. This lightcurve segment rules out
rotation periods less than 3 hr and suggests that the period is at least 5 hr.
On the assumption that the variability is due to a changing cross section, the
axial ratio is at least 3:1. We saw no evidence for a coma or tail in either
individual images or in a stacked image having an equivalent exposure time of
9000 s.
