MAVEN successfully completed orbital insertion about 45 minutes ago! It joins five other active spacecraft at Mars, three in orbit and two on the surface, for a staggering total of six active spacecraft. It’s a record that will not hold for long; Mangalyaan will arrive in a couple more days.
MAVEN’s initial orbit has a period of about 35 hours. The next major burn (and the final one for the main engine) will bring the orbital period down to 5 hours. The maneuvering engines will then be used to step it down a little further, finishing in an orbit that will, at periapsis, graze the atmosphere of Mars to allow the probe’s instruments to sample it.