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  SpaceX Dragon CRS-3 flight to the space station

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Author Topic:   SpaceX Dragon CRS-3 flight to the space station
Robert Pearlman
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Posts: 29459
From: Houston, TX
Registered: Nov 1999

posted 03-19-2014 05:25 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
SpaceX release
SpaceX CRS-3 Mission Overview

After three flights to the International Space Station (ISS), including two contracted resupply missions for NASA, SpaceX is set to launch its third Commercial Resupply Services (CRS) mission to the orbiting laboratory.

The SpaceX CRS-3 mission is targeting a launch at 3:25 p.m. EDT (1925 GMT) April 18 from Launch Complex 40 at the Cape Canaveral Air Force Station, Florida. If all goes as planned, Dragon will arrive at the station on April 20, when it will be grappled and berthed to the complex.

Background and Purpose

SpaceX CRS-3 is the third of at least 12 missions to the International Space Station that SpaceX will fly for NASA under the Commercial Resupply Services (CRS) contract.

In December 2008, NASA announced that SpaceX's Falcon 9 launch vehicle and Dragon spacecraft had been selected to resupply the space station after the end of the space shuttle program in 2011. Under the CRS contract, SpaceX is restoring an American capability to deliver and return significant amounts of cargo, which could include live plants and animals, to and from the orbiting laboratory.

Cargo

Dragon will be filled with about 4,600 pounds (2,100 kg) of supplies and payloads, including critical materials to support more than 150 investigations that will occur during Expeditions 39 and 40.

Dragon will carry four powered cargo payloads in its pressurized section and two in its unpressurized trunk, a first for SpaceX.

Dragon will return with about 3,600 pounds (1,600 kg) of cargo, which includes crew supplies, hardware and computer resources, science experiments, biotechnology, and space station hardware.

Science payloads include the Optical Payload for Lasercomm Science (OPALS), which will test the use of laser optics to transfer information to Earth from space; the Vegetable Production System (VEGGIE), a unit capable of producing salad-type vegetables in space; and the T-Cell Activation in Aging experiment that seeks the cause of a depression in the human immune system while astronauts are in microgravity.

In addition, the High Definition Earth Viewing (HDEV) investigation includes four high-definition cameras to be placed on the space station's exterior for use in streaming live video of Earth for online viewing.

Secondary Payloads

Falcon 9 will deliver five CubeSats to orbit as part of the CRS-3 mission, contained in four Poly Picosatellite Orbital Deployers.

See here for discussion of SpaceX's third Dragon CRS flight to the ISS.

Robert Pearlman
Editor

Posts: 29459
From: Houston, TX
Registered: Nov 1999

posted 04-10-2014 10:27 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
SpaceX photo release
Dragon got a few upgrades since its last trip to station.

To support more critical science payloads for the ISS, the spacecraft flying on Monday has nearly four times its previous powered cargo capability. Dragon will carry additional freezers in its pressurized section and for the first time ever, powered cargo inside its unpressurized trunk – NASA's OPALS and HDEV experiments. The spacecraft is also sporting redesigned cargo racks to accommodate the additional payloads.

Robert Pearlman
Editor

Posts: 29459
From: Houston, TX
Registered: Nov 1999

posted 04-14-2014 03:17 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
Helium leak scrubs SpaceX launch attempt

SpaceX scrubbed Monday's (April 14) launch of the CRS-3 mission at 3:39 p.m. EDT (1939 GMT) due to a helium leak from the Falcon 9 rocket's first stage.

A SpaceX representatives said that the company expects to be able to resolve the issue in time for their next launch opportunity on Friday (April 18) at 3:25 p.m. EDT (1925 GMT).

The weather forecast for Friday however, calls for only a 40 percent chance of favorable conditions.

Robert Pearlman
Editor

Posts: 29459
From: Houston, TX
Registered: Nov 1999

posted 04-16-2014 09:09 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
SpaceX confirms Friday for next launch attempt

NASA and SpaceX have confirmed Friday (April 18) for the next launch attempt for the Falcon 9 rocket to send the Dragon spacecraft on the company's third commercial resupply mission and fourth visit to the space station. Launch is scheduled for 3:25 p.m. EDT (1925 GMT).

A launch on Friday results in a rendezvous with the space station on Sunday (April 20) and a grapple at 7:14 a.m EDT (1114 GMT).

The U.S. Air Force 45th Weather Squadron forecast predicts a 40 percent chance of favorable weather, with a chance of showers and thunderstorms that could result in violating the Thick Cloud, Lightning and Flight Through Precipitation rules.

SpaceX has settled on a backup launch date of Saturday, April 19 for the best pair of launch dates for the science payloads being delivered to the station. If needed, a Saturday launch would occur at 3:02 p.m. EDT (1902 GMT). This would be a three-day, rather than two-day, transit to the station with grapple on Tuesday (April 22).

During Monday's (April 14) launch attempt, preflight checks detected that a helium valve in the stage separation pneumatic system was not holding the right pressure. This meant that the stage separation pistons would be reliant on a backup check valve.

No issue was detected with the backup valve and a flight would likely have been successful, but SpaceX policy is not to launch with any known anomalies. SpaceX has brought the vehicle back to horizontal and is replacing the faulty valve, as well as inspecting the system for anything that may have contributed to the valve not working as designed.

Robert Pearlman
Editor

Posts: 29459
From: Houston, TX
Registered: Nov 1999

posted 04-18-2014 03:44 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
collectSPACE
SpaceX launches science-packed Dragon capsule on space station supply run

A commercial space freighter loaded with more than two tons of scientific experiments and supplies launched for the International Space Station Friday (April 18), after more than a month of delays.

Space Exploration Technologies (SpaceX) Dragon capsule lifted off on a Falcon 9 rocket, also built by the company, at 3:25 p.m. EDT (1925 GMT) from Launch Complex 40 at the Cape Canaveral Air Force Station in Florida. Rain and low clouds earlier in the day threatened a scrub due to the weather, but conditions improved such that the flight could proceed.

Other than apparently some soiled water splashing on the Falcon 9 as it left the pad, the launch went smoothly, Elon Musk, SpaceX CEO and chief designer, told reporters.

"Everything looks great as far as the ascent phase of the mission," he said. "The rocket flight was perfect as far as we can tell."

Robert Pearlman
Editor

Posts: 29459
From: Houston, TX
Registered: Nov 1999

posted 04-20-2014 06:17 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
CRS-3 Dragon arrives at space station

SpaceX's Dragon cargo spacecraft arrived at the International Space Station on Sunday morning (April 20), two days after launching from Cape Canaveral, Florida.

Expedition 39 crew members Koichi Wakata and Rick Mastracchio monitored the Dragon's approach from inside the station's Cupola. The rendezvous with the outpost went smoothly, though the capsule experienced several communication dropouts, which were resolved well within the 30-second allowance.

Wakata was at the controls of the station's Canadarm2 robotic arm when it was moved in to capture the Dragon at 6:14 a.m. CDT (1114 GMT). At the time of grapple, the two spacecraft were 260 miles (420 kilometers) above the Nile River in Africa.

"Capture is complete," Wakata radioed to NASA's Mission Control in Houston. "Congratulations to the entire ops team for the successful launch, rendezvous and capture operation."

"The vehicle, the spacecraft, was very solid and very stable. And the Canadarm2 is really solid. It made it easy for us to capture," Wakata said.

The Dragon was berthed to the station's Harmony module at 9:06 a.m. CDT (1406 GMT) while orbiting above Brazil.

The hatch between the newly-arrived spacecraft and space station is scheduled to be opened on Monday. The Dragon is slated to spend 28 days at the outpost.

See here for discussion of SpaceX's third Dragon CRS flight to the ISS.

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