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   62013
   The extremely luminous, extremely massive star $\\eta$ Car is perhaps
   the Galaxy's most enigmatic object. Periodic emission line equivalent
   width variations and changes in Pa-$\\gamma$ radial velocity variations
   by Damineli and collaborators provide the strongest evidence to date
   that the star is a binary. If true this revises the fundamental
   understanding of the evolution of the system, the connection of $\\eta$
   Car to the Luminous Blue Variables (LBVs), and the nature of its
   atmospheric instabilities and the ``Great Eruption'' of the last
   century. {\\it ASCA} can make perhaps the most conclusive test of this
   model by determining the level of variation in the hard X-ray spectrum
   as a result of colliding-winds during the next predicted periastron
   passage, expected to occur on Jan 1, 1998
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