Gday Tony
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I use the LX90-10" for asteroid occultation work, in Alt-az, and its Gotos appear to be done to Jnow rather than J2000 co-ordinates. Using J2000 will not land me where I want ...
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ANY "user" supplied coordinates are required as JNow.
ie using Hbx entered coords, or any user objects, comets, asteroids etc.
Anything in the internal database uses the epoch of that data
( IIRC stars are J2000, but not sure on the deepsky stuff )
The 497s have no precession, PM or refraction routines
so what is entered is what is used.
The LX200s use precession and refraction for internal databases,
and apply PM for stars
but again, all user supplied data must be JNow.
( And before you ask, there is no easy way round it )
Andrew