These experiments link moving objects in Rubin difference images and fit their orbits. Detections that stay fixed are removed first. A pair of detections on one night becomes a tracklet, and tracklets on three or more nights become an object. The solar-system catalogue is opened only afterwards, to score the result.
Data Preview 1 is Rubin's first public preview, taken with the commissioning camera. The report here is one field from it, ECDFS, 1.4° across at ecliptic latitude −45.5°. Twelve objects crossed that field. Three were new, and the longest arc the field can hold is six days.
Data Preview 2 is the later preview. The window searched here is fourteen nights, MJD 60865 to 60878: 6,960 visits, about 3,800 square degrees, and 390 million difference-image detections, mostly along the ecliptic. The full-field report is a blind search of the real objects in that window. The minis plant synthetic orbits on 98 fields of the same window, a main-belt population, a near-Earth population, a trans-Neptunian population, and an interstellar population, so the recovery of a known population can be read off directly. The coverage of that window is drawn as a sky map you can pan and zoom.
The blind search of real objects over the whole DP2 field is the DP2 fortnight. The same window linked again, as overlapping cones with a second pass on the near-Earth grid, is the cone run.
The twelve objects found in the ECDFS field are Data Preview 1.