Task: Translation
Input (English): Astronomers who own amateur-class telescopes with apertures as small as 10 to 12 inches may be able to sight the ejecta cloud as it will have a period of brightness about one minute after impact .
Output (English): Astronomers who own amateur-class telescopes with apertures as small as 10 to 12 inches may be able to sight the ejecta cloud as it will have a period of brightness about one minute after impact.