SpaceX launches cargo capsule full of science experiments – Spaceflight Now
A SpaceX Falcon 9 rocket climbed into space Monday from NASA’s Kennedy Space Center atop a column of gleaming exhaust, shooting a commercial resupply vessel toward the International Space Station with research projects looking into cosmic rays, the origin of Parkinson’s disease, the utility of small satellites and an experimental radiation-tolerant supercomputer.
Crammed with more than 6,400 pounds (2,900 kilograms) of supplies, the Dragon capsule bolted on top of the Falcon 9 rocket also carried computer and camera gear, components to maintain the station’s life support system and medical equipment, and provisions for the station’s six-person crew, including clothing, fresh food and ice cream.
The 213-foot-tall (65-meter) rocket took off from pad 39A at the Florida spaceport at 12:31:37 p.m. EDT (1631:37 GMT), pitched toward the northeast to align with the space station’s orbit, and roared through scattered clouds before disappearing into a blue summertime sky.
Nine Merlin 1D main engines at the base of the booster generated 1.7 million pounds of thrust, pushing the rocket into the stratosphere before the first stage switched off and fell away at an altitude of 40 miles (65 kilometers).
A single Merlin engine fired on the Falcon 9’s upper stage to power the Dragon capsule into orbit. Glowing red-hot, the second stage engine throttled up to more than 200,000 pounds of thrust for its six-and-a-half minute firing.
Meanwhile, in a maneuver now common during SpaceX launches, the first stage flipped around with guided pulses of cold nitrogen gas to point tail first, then reignited three of its Merlin engines to boost itself back forward Cape Canaveral.
Two more braking maneuvers were needed to slow down the descending rocket, steering it back to the coast with the help of aerodynamic fins before extending four landing legs and settling on a concrete target at Landing Zone 1 less than eight minutes after liftoff, around 9 miles (15 kilometers) south of the Falcon 9’s departure point at pad 39A.
“From what I’ve heard, it’s right on the bullseye and (had a) very soft touchdown, so it’s a great pre-flown booster ready to go for the next time,” said Hans Koenigsmann, SpaceX’s vice president of flight reliability.
SpaceX has reused two of its recovered first stage boosters to date, and engineers are prepping another previously-flown rocket for a mission with an SES communications satellite this fall.
The rocket launched Monday was a fresh vehicle, but its landing legs were scavenged from a vehicle flown on a previous mission, Koenigsmann said.
The upper stage continued rocketing into orbit, turning off its engine just after the nine-minute point in the flight, then deploying the Dragon capsule into an on-target slightly egg-shaped orbit averaging around 175 miles (280 kilometers) above the planet.
“The second stage went into a near-perfect orbit (and) deployed Dragon,” Koenigsmann said in a media briefing around two hours after the launch.
“Dragon primed propellant and has performed the first co-elliptic burn at this point in time,” he said, referring to the first in a series of thruster firings on tap to guide the capsule toward the space station.
The supply ship’s power-generating solar arrays extended shortly after it arrived in space, while the Falcon 9’s second stage reignited for a de-orbit maneuver to avoid the creation of space junk.
With Monday’s launch, SpaceX’s Falcon 9 rocket family has accomplished 39 missions since debuting in 2010, and 38 of them have succeeded in their primary objectives. Those statistics do not include a Falcon 9 rocket that exploded before takeoff during testing on the launch pad, destroying an Israeli communications satellite.
SpaceX has landed the Falcon 9’s first stage intact 14 times in 19 tries since the company attempted its first rocket landing on a barge at sea in 2015. Six of those touchdowns have occurred at Landing Zone 1 at Cape Canaveral.
The automated cargo freighter will reach its destination Wednesday, when astronaut Jack Fischer will take command of the space station’s Canadian-built robotic arm to capture the commercial spaceship around 7 a.m. EDT (1100 GMT).
The robotic arm will install Dragon on the space station’s Harmony module for a planned 32-day stay.