If it hasn't cleared it's orbit yet, then it isn't a planet yet.
Scientists have found a trio of baby planets using a new technique of spotting unusual gas motion around developing stars. The new technique described in a pair of papers in the Astrophysical Journal Letters. It’s the first time it’s been used to find planets and has spotted three around the newborn star codenamed HD163296. …
Thursday 14th June 2018 03:14 GMT eldakka
> Most exoplanets are detected using the transit method. It measures a star’s brightness and looks out for the characteristic dip when a planet crosses its path and blocks out its light. Although it has been very successful at uncovering thousands of new exoplanets, it cannot be used to find ones around protostars.
Nor can it be used to find planets whose orbital period is greater than the period of observation such as planets like Saturn (29 years), unless they are very very lucky.
Nor can it be used to find planets whose orbital plane doesn't interpose itself between the parent star and Earth. Which, statistically, is probably most of them.
Thursday 14th June 2018 13:48 GMT 89724102372714531892524I9755670349743096734346773478647852349863592355648544996313855148583659264921