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Supernova 1978K is one of the oldest-known examples of the class of Type IInsupernovae that show evidence for strong interaction between the blast wave anda dense, pre-existing circumstellar medium. Here we report detections of SN1978K at both 34 GHz and 94 GHz, making it only the third extragalacticsupernova (after SN 1987A and SN 1996cr) to be detected at late-times at thesefrequencies. We find SN 1978K to be >400 times more luminous than SN 1987A atmillimetre wavelengths in spite of the roughly nine year difference in ages,highlighting the risk in adopting SN 1987A as a template for the evolution ofcore-collapse supernovae in general. Additionally, from new VLBI observationsat 8.4 GHz, we measure a deconvolved diameter for SN 1978K of ~5 milli-arcsec,and a corresponding average expansion velocity of <1500 km/s. Theseobservations provide independent evidence of an extremely dense circumstellarmedium surrounding the progenitor star.

SN 1978K: An evolved supernova outside our Local Group detected at millimetre wavelengths