We present the results of photometric observations of a dynamically new comet C/2010 S1 (LINEAR), conducted on June 18, 2012. The comet demonstrated a considerable level of physical activity at a heliocentric distance of 6.3 AU. The brightness, measuredunder a phase angle of 8.9 degrees, was equal to 14.55m [плюс-мінус] 0.06m and 14.21m [плюс-мінус] 0.04 m in V- and R-bands, respectively. The brightness distribution over the coma was found to be inversely proportional to the projected onto the sky plane nucleocentric distance, with a slope of approximately - 1. Therefore, the calculated Afp parameter, approximately 8400 cm and 8200 cm for V and R filters, respectively, was used to estimate the dust production rate. Assuming a steady outflow of dust particles from the nucleus, the dust production rate was estimated to be between 20 and 60 kg/s, depending on the assumed value of the grain"s albedo. The V-R colour index obtained from the near-nucleus region of the coma is in agreement with the solar V-Rcolour index, and does not indicate significant reddening of the reflected solar radiation in the spectral region of 540-683 nm.
