Аннотация:The observation results for comets C/2009 R1 (McNaught) (June 14-28, 2010) and 17P/Holmes (November 25-December 3, 2007) performed in the line of the OH molecule and at a wavelength of 18 cm are presented. The gas productivity of the OH molecule for comet C/2009 R1 (McNaught) (June 14-28, 2010) as a function of the heliocentric distance (0.42-0.62 au) is determined.