{"id":11398,"date":"2022-07-14T17:43:07","date_gmt":"2022-07-14T09:43:07","guid":{"rendered":"https:\/\/wp-productionenv-bjg9h2g2bgg5b8aa.southeastasia-01.azurewebsites.net\/news\/spacex-ready-to-launch-space-station-resupply-mission-after-five-week-delay\/"},"modified":"2022-07-14T17:43:07","modified_gmt":"2022-07-14T09:43:07","slug":"spacex-ready-to-launch-space-station-resupply-mission-after-five-week-delay","status":"publish","type":"post","link":"https:\/\/starpath.global\/news\/spacex-ready-to-launch-space-station-resupply-mission-after-five-week-delay\/","title":{"rendered":"SpaceX ready to launch space station resupply mission after five-week delay"},"content":{"rendered":"
\"\"
SpaceX\u2019s Cargo Dragon spacecraft and Falcon 9 rocket roll out to pad 39A at the Kennedy Space Center in Florida ahead of launch of the company\u2019s 25th cargo mission to the International Space Station. Credit: SpaceX<\/figcaption><\/figure>\n

SpaceX is set to launch its 25th resupply mission to the International Space Station Thursday night from NASA\u2019s Kennedy Space Center in Florida, following a five-week delay to resolve a leak in the Dragon cargo capsule\u2019s propulsion system.<\/p>\n

Liftoff of the commercial cargo mission is set for 8:44:22 p.m. EDT Thursday (0044:22 GMT Friday) from pad 39A at Kennedy. A SpaceX Falcon 9 rocket will give the mission a boost into orbit, putting the Dragon spacecraft on course for docking at the space station at 11:20 a.m. EDT (1520 GMT) Saturday.<\/p>\n

Astronauts at the space station will open hatches and unpack supplies, experiments and other equipment stowed inside the Dragon capsule\u2019s pressurized compartment. At the end of the mission, the reusable capsule will undock from the station and head for a parachute-assisted splashdown off the coast of Florida in mid-August with several tons of cargo.<\/p>\n

The cargo ship is launching with around 5,800 pounds of supplies and payloads, including a NASA climate instrument to be mounted outside the space station.<\/p>\n

The Earth Surface Mineral Dust Source Investigation, or EMIT, instrument was developed by NASA\u2019s Jet Propulsion Laboratory. It will be attached to a mounting post outside the space station to measure the mineral content of the world\u2019s desert regions, the source of global dust storms that can impact climate and weather worldwide.<\/p>\n

Data collected by the instrument will help scientists learn more about how dust lifted into the atmosphere from deserts impact Earth\u2019s ecosystems and human health.<\/p>\n

\u201cThis is going to be a really busy mission for us,\u201d said Dana Weigel, NASA\u2019s deputy space station program manager. \u201cIt\u2019s packed with a lot of science. The planned duration is about 33 days.\u201d<\/p>\n

The mission is the 25th flight to the space station under SpaceX\u2019s Commercial Resupply Services contract with NASA. This flight, named CRS-25, was scheduled for launch in early June, but officials grounded the Dragon spacecraft after finding a leak in the ship\u2019s propulsion system.<\/p>\n

SpaceX detected \u201celevated vapor readings\u201d of monomethyl hydrazine, or MMH, fuel in an \u201cisolated region\u201d of the Dragon spacecraft\u2019s propulsion system during propellant loading ahead of the launch in early June, NASA said in a statement in June.<\/p>\n

The fueling of the Dragon spacecraft is one of the final steps to prepare the capsule for flight, and typically occurs just before SpaceX moves the craft to the launch pad for integration with its Falcon 9 rocket.<\/p>\n

The Dragon spacecraft has propellant tanks containing hydrazine fuel and nitrogen tetroxide oxidizer. The two propellants ignite upon contact with each other, providing an impulse for the cargo ship\u2019s Draco thrusters used for in-orbit maneuvers.<\/p>\n

Each Dragon spacecraft has 16 Draco thrusters, small rocket engines that generate about 90 pounds of thrust. The Draco engines are used for orbit adjustment burns and control the spacecraft\u2019s approach to the space station, then fire at the end of the mission for a deorbit burn to guide the capsule back into the atmosphere for re-entry and splashdown.<\/p>\n

SpaceX\u2019s ground processing team, working at the Dragon refurbishment facility at Cape Canaveral Space Force Station, offloaded fuel and oxidizer from the area of the spacecraft with the elevated hydrazine vapor readings.<\/p>\n

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SpaceX\u2019s Falcon 9 rocket and Cargo Dragon spacecraft await liftoff from NASA\u2019s Kennedy Space Center in Florida. Credit: SpaceX<\/figcaption><\/figure>\n

Benji Reed, SpaceX\u2019s senior director of human spaceflight programs, said the vapor leak in the Dragon propulsion system was caused by \u201cimperfections in the sealing surface where a valve connects into the system.\u201d<\/p>\n

Technicians replaced the valve and confirmed the leak stopped, allowing preparations for the CRS-25 launch to resume at Cape Canaveral. SpaceX\u2019s ground team also replaced the four main parachutes already stowed on the capsule \u201cout of abundance of caution,\u201d Reed told reporters Wednesday.<\/p>\n

Officials were concerned the vapors from the toxic hydrazine could have interacted and damaged material in the parachutes. Initial inspections of the chutes removed from the spacecraft show no obvious signs of degradation, Reed said, and the parachutes could be used on a future Dragon mission.<\/p>\n

Reed said the issue that caused the leak does not affect other Dragon spacecraft in SpaceX\u2019s fleet, including the Dragon crew capsule currently docked at the space station.<\/p>\n

The connection in the propulsion system identified as the source of the hydrazine vapor leak had a sealing surface that was \u201creworked a little bit,\u201d Reed said. But the sealing passed SpaceX\u2019s preliminary testing, and teams didn\u2019t catch the leak until performing a full-up test of the propulsion system before moving the spacecraft over to the Falcon 9 hangar for rocket integration.<\/p>\n

\u201cThis was something that was caught early on because of the testing that we already do,\u201d Reed said. \u201cThis is well before we\u2019re in a situation where we\u2019re stacked on the vehicle on the pad and worrying about going into launch.\u201d<\/p>\n

But SpaceX will beef up testing to try to catch similar occurrences earlier, Reed said.<\/p>\n

With the leak resolved, SpaceX pressed ahead with launch preparations earlier this month, transferring the cargo capsule to the hangar at pad 39A to meet its Falcon 9 launcher.<\/span><\/p>\n

SpaceX rolled the fully-assembled launcher to pad 39A on Tuesday, then raised the 215-foot-tall (65-meter) Falcon 9 vertical. Pad teams completed final loading of last-minute, time-sensitive cargo into the Dragon spacecraft Wednesday using the crew access arm extended to connect to the ship\u2019s hatch.<\/span><\/p>\n

With preparations complete, SpaceX\u2019s launch team at Kennedy plans to switch on the Falcon 9\u2019s control systems and activate the Dragon spacecraft Thursday for final countdown checks. If all parameters are \u201cgo\u201d for launch, SpaceX will begin loading super-chilled, densified kerosene and liquid oxygen into the two-stage Falcon 9 rocket about 35 minutes prior to liftoff.<\/p>\n

There is a 70% chance of favorable weather for launch Thursday, according to the U.S. Space Force\u2019s 45th Weather Squadron. The main weather concerns are with cumulus clouds that could create a risk for lightning, and flight through precipitation.<\/p>\n

\"\"
A view inside the Cargo Dragon spacecraft\u2019s trunk, showing NASA\u2019s EMIT climate instrument on the right. A battery charge\/discharge unit for the space station is on the left. Credit: SpaceX<\/figcaption><\/figure>\n

After liftoff, the Falcon 9 will head downrange northeast from Florida\u2019s Space Coast, powered by nine Merlin engines generating 1.7 million pounds of thrust. The rocket will shut down its first stage booster about two-and-a-half minutes into the mission, allowing the booster to descend to landing on a drone ship in the Atlantic Ocean about seven-and-a-half minutes after liftoff.<\/p>\n

The booster, tail number B1067, is making its fifth flight on the CRS-25 mission. It previously launched the CRS-22 cargo mission last June, launched two NASA crew missions to the station, and hauled Turkey\u2019s Turksat 5B communications satellite into space.<\/p>\n

The Dragon spacecraft will deploy from the Falcon 9\u2019s upper stage about 12 minutes after liftoff to begin the day-and-a-half journey to the International Space Station. The Dragon cargo capsule on the CRS-25 mission is launching on its third flight to the station.<\/p>\n

Email the author.<\/i><\/b><\/p>\n

Follow Stephen Clark on Twitter: @StephenClark1.<\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

SpaceX\u2019s Cargo Dragon spacecraft and Falcon 9 rocket roll out to pad 39A at the Kennedy Space Center in Florida ahead of launch of the company\u2019s 25th cargo mission to the International Space Station. Credit: SpaceX SpaceX is set to launch its 25th resupply mission to the International Space Station Thursday night from NASA\u2019s Kennedy […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[2],"tags":[],"class_list":["post-11398","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/11398"}],"collection":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/comments?post=11398"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/11398\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=11398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=11398"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=11398"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}