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This paper reports the first OH 18-cm line observation of the first detectedinterstellar object 1I/2017 U1 (`Oumuamua) using the Green Bank Telescope. Wehave observed the OH lines at 1665.402 MHz, 1667.359, and 1720.53 MHzfrequencies with a spectral resolution of 357 Hz (approximately 0.06km-s^{-1}). At the time of the observation, `Oumuamua was at topocentricdistance and velocity of 1.07 au and 63.4 km-s^{-1}, respectively, or atheliocentric distance and velocity of 1.8 au and 39 km-s^{-1}, respectively.Based on a detailed data reduction and an analogy-based inversion, our finalresults confirm the asteroidal origin of `Oumuamua (as discussed in Meech etal., 2017) with an upper bound of OH production of Q[OH] < 0.17 x 10^{28}s^{-1}.

Search for OH 18-cm radio emission from 1I/2017 U1 with the Green Bank telescope