In preparation for Space Shuttle Mission STS-87, the orbiter Columbia rolled into the Vehicle Assembly Building transfer aisle at about 6 a.m. today. The orbiter will be mated to the external tank and solid rocket boosters in high bay 3 over the weekend and is slated to roll out to Pad 39B on Wednesday. STS-87 will be the fourth flight of the United States Microgravity Payload and the Spartan-201 deployable satellite