Simplify the following text for a Grade 11 native English-speaking person.
Original: Cruithne was discovered on October 10 , 1986 , by Duncan Waldron on a photographic plate taken with the UK Schmidt Telescope at Siding Spring Observatory , Coonabarabran , Australia .
Simplified: 3753 Cruithne was discovered on October 10 , 1986 , by Duncan Waldron on the UK Schmidt Telescope at Siding Spring Observatory , Coonabarabran , Australia .