This code works for me. Btw these days i am reading tutorial/IntroductionToControlObjects
Animate[
Show[
{plot1
, Graphics[{
RGBColor[0, 0, 1]
, Disk[{Sqrt[3] Sin[x], Sqrt[3/2] Cos[x]}, 0.1]
}]
}, PlotRange -> {{-1.9, 1.9}, {-1.5, 1.5}}
], {x, 0, 2 Pi, 0.3}
]