This website is the key: minor planet checker
It allows me to plug in coordinates on the sky, and a timestamp, and say "Show me all known asteroids within a certain radius of that spot, at that time, that are brighter than a certain magnitude."
And it nailed my two little visitors.
2000 WM154 is a rock about 1.4 miles across. It once got within about 2 million miles of Earth, in August of the year 1900. Its apparent magnitude when this image was taken is 19.96 .
2000 WF151 is about 0.85 miles across, and it never comes within the orbit of Mars. Apparent magnitude here is 19.53 .
The amazing part is that these two little guys, and great Philosophia, have nothing to do with each other! A little while from now they will be nowhere near each other in the sky as seen from Earth.
Getting all three of them together in one shot like this is a tremendous stroke of luck. This is a really valuable image.
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