  As exoplanetary science matures into its third decade, we are increasingly
offered the possibility of pre existing, archival observations for newly
detected candidates. This is particularly poignant for the TESS mission, whose
survey spans bright, nearby dwarf stars in both hemispheres, which are
precisely the types of sources targeted by previous radial velocity (RV)
surveys. On this basis, we investigated whether any of the TESS Objects of
Interest (TOIs) coincided with such observations, from which we find 18 single
planet candidate systems. Of these, one exhibits an RV signature that has the
correct period and phase matching the transiting planetary candidate with a
false alarm probability of less than 1 percent. After further checks, we
exploit this fact to validate HD 183579b (TOI-1055b). This planet is less than
4 Earth Radii and has better than 33 percent planetary mass measurements, thus
advancing the TESS primary objective of finding 50 such worlds. We find that
this planet is amongst the most accessible small transiting planets for
atmospheric characterization. Our work highlights that the efforts to confirm
and even precisely measure the masses of new transiting planet candidates need
not always depend on acquiring new observations - that in some instances these
tasks can be completed with existing data.
