****************************************************** PR # 41132 We propose to observe the BL Lac object PKS 0735+178, aiming to study physical state in its cosmical jet. This object is well observed in many wavelengths including GeV bands with the EGRET instrument onboard CGRO. Since ASCA bands would cover the connective region between synchrotron and its self-Comptonized components, it is expected to determine the ratio of two components. In addition, short time variability was also reported by Madejski with Einstein, which suggests the possibility to detect synchrotron soft-lagged variation to determine its magnetic field. Therefore, the source is expected to study magnetic field, electron density and doppler factor of the jet. Reported superluimnal motion will also be helpful to determine inclination and speed of the jet. ******************************************************