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It may very well be. Estimates of comet density average about .6g/cm^3 (of course the data is spotty). I selected the density of water as a standard because of its ease of use and the fact that it is a metric that most people understand. That said, the USDA standard for full fat ice cream is a minimum of 4.5 lbs/gallon. Conversion to the metric system gives a density of approximately 539 grams/liter or .539g/cm^3, slightly under the estimated average comet density. Recalculating the mass of the comet using the density of full fat ice cream, we arrive at 3.5*10^13 metric tons. If the collision takes place, it will still be a significant event.