There's a theory that time is a function of Sol's gravity acting on an object, and that a planetary mass object such as Planet X for instance, in an off the ecliptic orbit would appear to us on earth from our point of view, as if a stone skipping across water ... there, then not.

With such a theory, it might only become constantly visible as it approaches the ecliptic passing through the plane of orbit of the planets in the solar system, including earth.

Food for thought, ... or maybe its just a weather balloon.