| 5 | 7 | In the 2MASS PSC, all sources are described by the equivalent of a single database row, with separate fields in the row for J, H, and K specific measurements, and some fields common to all three filters. For example, the coordinates and observing time are all given as a single value for all three filters. In the conversion to the DVO representation, each measurement (JHK) of an object is converted to a separate DVO measurement entry. All 2MASS sources are guaranteed to have all three measurements instantiated, but in some cases the measurements may be upper limits (non-detections in those filters). Below, we list the relationship between the 2MASS information on the left side of the -> and the DVO measurement field on the right side. |
