Surprise, Asteroid 1998 QE2 has a moon!

[DreamGypsy]

3. Gee, I'm a lot less than 1.7 miles in diameter ...

...and I have a moon. Not observed by a lot of people, I hope...my parents, my wife, I guess a bunch of guys in the showers after PE. I have no idea how it would appear to radar...?

But seriously, CA-Peggy, you have a good point.

I searched on "smallest moon" and found this, What is the smallest moon in the solar system?:

There are hundreds of Moons that are around 10 kilometers or less in diameter. Mainly in orbit around Jupiter or Saturn.

Jupiter's smallest moon is probably S/2003 J 12 or S/2003 J9 at only 1 kilometer in diameter.

Saturn's smallest moon is probably Aegaeon at only 0.5 kilometer in diameter - although it is classified as a moonlet.

If you don't want the moon to be around a planet, the Asteroid IDA (243 IDA) has a tiny moon called Dactyl which is under a kilometer in diameter.

So, Aegaeon wins as the smallest known moo(let), at 500 meters in diameter. The unnamed moon of Queen Elizabeth 1998 is apparently second.