Update: This post has been updated to reflect weights in troy ounces in reference to estimates for the asteroids potential platinum composition.

Forget the Pluto flyby. Metals bugs were buzzing Monday after a metallurgically rich asteroid rocketed past Earth on Sunday evening, boasting an out-of-this-world cache of precious metals.

Astronomers speculated that the asteroid, known as 2011 UW-158, which passed about 1.5 million miles from Earth, might have carried as much as $5.4 trillion worth of precious metals and minerals, according to Slooh, which connects telescopes to the Internet.