Aura, the latest caboose in the "A-train" from NASA, launched successfully (albeit, after hiccups) and entered Earth's orbit 438 miles above on Thursday, July 15 2004. An excerpt below from an early article on Aura:

Aura is the third large spacecraft developed for NASA's Earth Observing System project. The first, Terra, launched in 1999, focuses primarily on land-based phenomena, like snow cover, surface temperature and vegetation. The follow-up Aqua satellite, launched in 2002, studies water-related events such as precipitation and evaporation. Aura fills in the gap by surveying the atmosphere, from the ground up.