In May of 1969 Apollo 10, named for Charlie Brown and Snoopy, was a test of the Lunar Module capabilities for landing on the Moon months later. It was the 2nd spacecraft to orbit the Moon. The LM separated from the Command Module and flew by itself piloted by Eugene Cernan but never landed. After testing the LM (Snoopy) was released to a heliocentric orbit of the Sun forever.
Snoopy was lost.
Back then, NASA did not follow Snoopy's trajectory, so it was forgotten about until Nick Howes, a Royal Astronomical Society fellow from the U.K., recently shared that he may have found the module with a team of fellow amateur astronomers in 2019.