Strange pieces of space junk astronomers have had their eye on for a few weeks now has finally entered the Earth's atmosphere, burning up in stunning fireballs.

Appropriately named WTF 1190F, the junk was spotted and recorded flaming through the sky on Friday, which just happened to be the 13th day of the month. An international team of scientists captured the fireballs as they flew over Sri Lanka early Friday morning, according to Space.com.

The fireballs were not visible from the ground and the scientists who captured the images did so aboard a Gulfstream 450 business jet.

The European Space Agency (ESA) previously stated WTF 1190F is likely remnants of an old rocket mission.

"NEO experts have used observational data to estimate the object's density, which turns out to be much less than that of the solid rocky material that comprises many asteroids," Detlef Koschny, who studies near-Earth objects at the ESA's Space Situational Awareness office, said in a news release. "This density is in fact compatible with the object being a hollow shell, such as the spent upper stage of a rocket body or part of a stage."

Mark Boslough, of the Sandia National Laboratories in New Mexico, stated during a Slooh Observatory webcast that the debris could be from spacecraft used in the Apollo missions of the 1960s, Space.com noted.

"There aren't that many things we launch into orbits that would take them beyond the moon, he said, so it's most likely a piece of a lunar mission."