Millimeter continuum observations of Comets

We have been utilizing the high sensitivity of MAMBO at the IRAM 30m telescope to detect thermal emission from the particle halo around comets. With such measurements we can study the particle size distribution and the total particle mass in the halo and indirectly derive the nuclear diameter and mass. During the past two years we were able to detect thermal emission from three comets. In the following we briefly describe results from two of these observations.