With this method of alternating two successive exposures separated by a few minutes (named "blink") solar system objects are detected.
Here, on a field of 12 minutes of degree, we can see five moving objects:
(1): top left, (3939) Huruhata
(2): right (40747) 1999 TK5
(3): middle, a small object, probably (13425) 1999 VG24
(4): below a distant satellite of Jupiter J-8
(5): middle down (377) Campania, observed on November 9, 1999 at 20hr UTC.