And most of the Exoplanets are actually found by observing the small doppler (color) shift of the parent star light as the planet tugs the star towards us then away from us, which is why most of the planets found so far are close to their parent stars (means we can find the color/doppler shift with shorter observation times). Since this object would be beyond the orbit of Neptune, its orbit period is longer, thus one would have to make very precise observations over baselines of a century or so to see the signal start to show up in solar observations. We might just be getting close to that threshold now though if someone wanted to try to compile the last century of data and try to correct for all the instrument bias and other sources from the rest of the known solar system. That would only give us the general orbit period and distance though.