NASA tracking asteroid with minor chance of hitting Earth in 2046

NASA is tracking an asteroid that could hit on Valentine’s Day in 2046. (Supplied: NASA)

Space experts say a newly found asteroid has a small chance of impacting Earth about 20 years from now. 

The asteroid, known as 2023 DW, is nearly 50 metres in diameter and could arrive on Valentine's Day in 2046, according to NASA calculations.