Watch SpaceX launch its last cargo mission to the space station of 2019

 theverge.com  12/04/2019 14:44:49   Loren Grush

This afternoon, SpaceX is set to launch its Dragon cargo capsule, filled with nearly 5,700 pounds of cargo and supplies for the crew of the International Space Station. Its SpaceXs last resupply mission to the station for 2019. Following the flight, SpaceX will attempt one of its signature rocket landings, targeting a drone ship floating in the Atlantic Ocean.

Its atypical for SpaceX to do an ocean landing after a flight to the ISS. Normally, the company tries to land its Falcon 9 rocket on a concrete landing pad on solid ground. Thats because theres usually enough propellant left over to pull off such a ground landing. Getting to low Earth orbit  where the space station lives  is a fairly short trip. That means theres usually enough leftover propellant for SpaceX to turn around and head back to land, a process that eats up more propellant than landing in the ocean.

However, SpaceX is trying something new for this mission. After the Falcon 9 drops off the Dragon capsule in orbit, the top portion of the rocket will stay in space longer than usual, performing a lengthy six-hour coast. Its a thermal demonstration that SpaceX is performing for some of its other customers, according to Jessica Jensen, director of Dragon mission management at SpaceX. I cant give too much more detail about it, she said during a press conference before the launch, adding that the maneuver was for longer demonstration missions that were going to have to fly in the future.

Because of this, SpaceX needs to burn extra propellant on the way up, which means the Falcon 9 wont have as much leftover propellant to travel back to the landing site. An ocean landing will have to do.

If the launch goes as planned today, SpaceXs Dragon capsule is set to meet up with the International Space Station on Saturday, December 7th. It will bring numerous science experiments to the ISS, including one that will study how flames spread when in small spaces. Dragon is also carrying the first Mexican-developed small satellite, which was created by students in Mexico to demonstrate ways for satellites to communicate with one another in orbit. Dragon will stay at the ISS for about a month before returning back to Earth, filled with 3,800 pounds of cargo and scientific samples. When it returns, itll be bringing back samples that represent about 54 investigations, Bryan Dansberry, the assistant program scientist with the International Space Station program science office, said during the press conference.

Todays launch will jump-start a busy traffic month for the ISS. After SpaceX makes it to the station, a Russian cargo ship will also launch to the ISS on December 6th. Then, on December 19th, Boeing will launch its new passenger spacecraft, the CST-100 Starliner, to the ISS for the very first time. No astronauts will be on board, but the spacecraft will run through all the things its supposed to do during future flights: it will attempt to dock with the station, stay attached for four to five days, and then make the perilous journey back to Earth (hopefully in one piece). If all goes well, it should pave the way for Boeings next big flight with the Starliner sometime next year, which will transport its first passengers to the ISS.

SpaceX also has a busy couple of months ahead. The company is set to launch a communications satellite in mid-December, followed by another launch of its Starlink satellites potentially by the end of the month. SpaceX is also on tap to perform a test flight with its own passenger spacecraft, the Crew Dragon, to demonstrate the capabilities of the vehicles emergency escape system. That flight could happen this month or in early January.

But first, todays launch needs to get underway. Liftoff is scheduled for 12:51PM ET from SpaceXs launch site at Cape Canaveral Air Force Station in Florida. SpaceX is using a brand-new Falcon 9 for this job, although the Dragon capsule has flown the space station twice before. The Falcon 9s landing attempt will take place about eight minutes after takeoff. So far, the weather is looking a little tricky. Theres a 90 percent chance conditions will be favorable, though winds high above the launch site could be an issue, reaching up to 120 knots.

Both NASA and SpaceX will provide live coverage. NASAs begins at 12:30PM ET, and SpaceXs will begin about 15 minutes before takeoff. Check back then to see if the Falcon 9 can overcome those fast upper-level winds.

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