Mystery object entering Earth's orbit 'to become planet's mini-moon until May'

dailystar.co.uk:

moon – but experts have been left baffled at what the mystery object actually is.An object known as 2020 SO is heading towards Earth and from October it will be a "mini-moon", which could stay in orbit of the planet until May next year.Another object, named 3753 Cruithne, has already been dubbed Earth's "second moon" – meaning 2020 SO would be our third.Cruithne is in a normal elliptic orbit around the Sun.

Its period of revolution around the Sun, approximately 364 days at present, is almost equal to that of Earth.Because of this, Cruithne and our planet appear to "follow" each other in their paths around the Sun and has led to the body being called "Earth's second moon".Earth also regularly gets many small asteroids and meteors caught in.