Live at KSC: Commander aboard spaceship

Endeavour mission commander Mark Polansky entered the orbiter's crew cabin just before 3:30 p.m.

Six more crew members will follow.

Mission managers are tracking a rain shower moving east toward the launch pad.

Pilot Doug Hurley will be the next to board Endeavour. He'll sit next to Polansky, in the flight deck's front, righthand seat .

Polansky, an 53-year-old Air Force veteran, is a veteran of two prior shuttle flights, as a pilot in 2001 and a commander in 2006.

Hurley, a 42-year-old Marine Corps lieutenant colonel, is a first-time flyer.

Polansky quickly began communications checks with launch controllers under the moniker of "CDR" for commander.

The seven-person closeout crew, which includes an active astronaut, helps each crew member enter the orbiter and get strapped into their seat.