Iridium losing some molecules

A reader points out to us that Iridium, the element, has the atomic number 77, but, so far, has only launched 66 satellites. Where, we are bound to ask, are the missing 11 satellites? So far, Iridium is only Dysprosium, a rare-earth element found only in traces. We're tempted to compare the satellite system Iridium with something also only found in traces... ®