Photoelectric photometry of Comet Arend-Roland (1956h)

. Photoelectric observations of comet Arend-Roland were made on eleven nights in the blue, yellow and with an interference filter centered at 4065 A. The intensity with the interference filter decreased less rapidly than in the blue and yellow for which agreement with the results of Thiessen were found. Intensity tracings across the comet could be adequately represented by the fountain model with a Maxwell-Boltzmann distribution for the ejection velocities.