Millimeter continuum observations of parent comets of meteor storms

The 2 millimeter continuum observations of parent comets of meteor storms, P/Tempel-Tuttle and P/Giacobini-Zinner, were made with a bolometer array in stalled on the 45 m radio telescope at the Nobeyama Radio Observatory. P/Te mpel-Tuttle was observed on 1998 January 16, near its closest approach to t he earth, and P/Giacobini-Zinner was observed on 1998 November 5 and 8. The maps obtained showed no signal from these comets greater than 12.0 mJy for P/Tempel-Tuttle and 17.4 mJy for P/Giacobini-Zinner (3 sigma). Using the s ame assumptions as Jewitt & Mathews, we estimated that the mass upper limit s in the 12 " beam were 7.5 x 10(9) kg and 6.2 x 10(10) kg for P/Tempel-Tut tle and P/ Giacobini-Zinner, respectively.