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   PR # 22111
    The unusual morphology of the supernova remnant 3C400.2 suggests that
    it may consist of a SNR re-energizing an existing cavity created by  
    an earlier SNR.  A new high resolution radio image shows two         
    interacting shells, while the Einstein IPC image reveals X-ray       
    emission from the entire interior of the two remnants, with a peak   
    near their intersection.  Optical images also exhibit enhanced       
    emission in this area.  ASCA SIS observations of this remnant will be
    able to distinguish between thermal and nonthermal emission, thereby 
    resolving a current ambiguity.  In the former case, ASCA can measure 
    line fluxes and determine abundances in the remnant.  This large SNR 
    should be observed by ASCA before 4 CCD mode becomes impractical due 
   to increased flickering pixels
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