@Mark 85.
Since any entry documentation is lost or long gone it is illegal and clearly in a 'Hostile environment'
So it should only be a matter of time before the relevant authorities catch up with it.
As a non-rocket scientist with the maths abilities of a lump of cheddar; would it be possible to send a probe the wrong way around the sun to achieve a braking effect rather than a slingshot effect and then use other sources of gravitation to accelerate it in a retrograde orbit to catch up with the immigrant?