Re: Serious Question
Serious answer : you can orbit just about anything.
The Earth has a density of about 5.5 gm/cm^3, and a low orbit around it takes about a hundred minutes. Same is true for _any_ object of that density. Bennu is about 12000 times smaller than Earth, but if it had the same density, you'd just orbit at about 1/12000 the speed (orbital speed would be about 60 cm/s) and still complete about one orbit every hundred minutes.
Your average asteroid has a somewhat lower density than that, though, more like 3 gm/cm^3. Orbital period runs as the inverse square root of density, so the orbital period would be only slightly longer than 100 minutes and speed only slightly less than 60 cm/s.
Also note that this is for an orbit really near the surface, which is easier for a roundish object such as the earth (disregarding equatorial bulge and atmosphere) than it would be for a small, irregular rock such as Bennu. If you need a speed of 60 cm/s near the surface (250 m from the object's center), then an orbit that is, say, a hundred times further out (25 km) would require a tenth that speed, or 6 cm/s. You'd have to do some very gentle maneuvering; exceed orbital speed by about 40% at any point, and you reach escape speed. But I suspect our friends at NASA are, in fact, being careful about that.