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→‎Launch failure: comment <!-- ... --> timing from video@ http://spaceflightnow.com/2015/06/28/video-spacex-supply-ship-explodes-just-after-launch/
→‎Launch failure: leak @T+2:19, disintegration of first stage @ T+2:28, all ±1 sec approx.
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==Launch failure==
==Launch failure==
The vehicle's second stage failed due to an overpressure at T+02:19, well after [[max Q]] (at T+01:26<ref name=launchvideo>{{Cite video |url=https://www.youtube.com/watch?v=ZeiBFtkrZEw#t=22m51s |time=22:51 |timecaption=The animated launch timeline can be seen passing Max-Q (T+01:26) at |title=SpaceX CRS-7 Launch |publisher=SpaceX |via=YouTube |date=2015-06-28}} Likewise, MECO can be seen at T+02:45.</ref>) and before first stage engine shutdown (MECO, scheduled at T+02:45).<ref name=launchvideo/> The second stage disintegrated, releasing large clouds of vapor while the first stage continued to thrust stably on course for about 9 sec, until it disintegrated at T+02:28. Aircraft were sent to the debris area in the Atlantic Ocean and an investigation is ongoing.<ref>{{cite web|title=NASA TV Livestream|url=http://www.nasa.gov/multimedia/nasatv/|website=nasa.gov|publisher=NASA|accessdate=June 28, 2015}}</ref><!--needs replacement with an archive later --><ref>{{cite news|last1=Harwood|first1=William|title=SpaceX Falcon 9 rocket destroyed in launch mishap|url=http://www.cbsnews.com/news/spacex-falcon-9-rocket-destroyed-in-launch-mishap/|accessdate=June 28, 2015|work=CBS News|date=June 28, 2015}}</ref> It was the first Falcon 9 failure in the 19 launches of the rocket type.<ref>{{Cite web | url = http://www.bbc.co.uk/news/science-environment-33305083 | title = Unmanned SpaceX rocket explodes after Florida launch | publisher = BBC News | date = June 28, 2015 |accessdate = June 28, 2015}}</ref> According to the founder of SpaceX, [[Elon Musk]], on Twitter: "[The] Falcon 9 [launch vehicle] experienced a problem shortly before first stage shutdown. Will provide more info as soon as we review the data." He added: "There was an overpressure event in the upper stage liquid oxygen tank. Data suggests counterintuitive cause."<ref>{{cite news|last1=Wattles|first1=Jackie|last2=Crane|first2=Rachel|title=SpaceX rocket explodes after launch|url=http://money.cnn.com/2015/06/28/technology/spacex-rocket/|accessdate=28 June 2015|work=CNN Money|date=June 28, 2015}}</ref><!-- Accident happened about 10s into second stage engine chill, which is done with LOX. Speculation: "Counterintuitive" suggests pressure increased after valves opened for prechill.--><!-- Based on timing of launch video from http://spaceflightnow.com/2015/06/28/video-spacex-supply-ship-explodes-just-after-launch/, lift-off first movement @0:31, def T=9, Then first evidence of LOX leak @video 2:50, ie, T+2:19; first stage normal and stable on-course for another ~9-10 sec, until video @02:59 blow up and disintegration at T+2:28 ff. NO FLIGHT TERMINATION SIGNAL SENT, per press conferences. -->
The vehicle's second stage failed due to an overpressure at T+02:19, well after [[max Q]] (at T+01:26<ref name=launchvideo>{{Cite video |url=https://www.youtube.com/watch?v=ZeiBFtkrZEw#t=22m51s |time=22:51 |timecaption=The animated launch timeline can be seen passing Max-Q (T+01:26) at |title=SpaceX CRS-7 Launch |publisher=SpaceX |via=YouTube |date=2015-06-28}} Likewise, MECO can be seen at T+02:45.</ref>) and before first stage engine shutdown (MECO, scheduled at T+02:45).<ref name=launchvideo/> The second stage developed a very large LOX leak, releasing large clouds of vapor while the first stage continued to thrust stably on course for about 9 sec, until it disintegrated at T+02:28. Aircraft were sent to the debris area in the Atlantic Ocean and an investigation is ongoing.<ref>{{cite web|title=NASA TV Livestream|url=http://www.nasa.gov/multimedia/nasatv/|website=nasa.gov|publisher=NASA|accessdate=June 28, 2015}}</ref><!--needs replacement with an archive later --><ref>{{cite news|last1=Harwood|first1=William|title=SpaceX Falcon 9 rocket destroyed in launch mishap|url=http://www.cbsnews.com/news/spacex-falcon-9-rocket-destroyed-in-launch-mishap/|accessdate=June 28, 2015|work=CBS News|date=June 28, 2015}}</ref> It was the first Falcon 9 failure in the 19 launches of the rocket type.<ref>{{Cite web | url = http://www.bbc.co.uk/news/science-environment-33305083 | title = Unmanned SpaceX rocket explodes after Florida launch | publisher = BBC News | date = June 28, 2015 |accessdate = June 28, 2015}}</ref> According to the founder of SpaceX, [[Elon Musk]], on Twitter: "[The] Falcon 9 [launch vehicle] experienced a problem shortly before first stage shutdown. Will provide more info as soon as we review the data." He added: "There was an overpressure event in the upper stage liquid oxygen tank. Data suggests counterintuitive cause."<ref>{{cite news|last1=Wattles|first1=Jackie|last2=Crane|first2=Rachel|title=SpaceX rocket explodes after launch|url=http://money.cnn.com/2015/06/28/technology/spacex-rocket/|accessdate=28 June 2015|work=CNN Money|date=June 28, 2015}}</ref><!-- Accident happened about 10s into second stage engine chill, which is done with LOX. Speculation: "Counterintuitive" suggests pressure increased after valves opened for prechill.--><!-- Based on timing of launch video from http://spaceflightnow.com/2015/06/28/video-spacex-supply-ship-explodes-just-after-launch/, lift-off first movement @0:31, def T=9, Then first evidence of LOX leak @video 2:50, ie, T+2:19; first stage normal and stable on-course for another ~9-10 sec, until video @02:59 blow up and disintegration at T+2:28 ff. NO FLIGHT TERMINATION SIGNAL SENT, per press conferences. -->


== Post-launch flight test ==
== Post-launch flight test ==

Revision as of 01:05, 30 June 2015

Template:Launching/Falcon (Canaveral)

SpaceX CRS-7
Disintegration of the SpaceX CRS-7 launch vehicle at about two minutes after liftoff as seen from a NASA tracking camera.
Mission typeISS resupply
OperatorNASA
Mission duration2 minutes 19 seconds
(1 month planned)
Spacecraft properties
Spacecraft typeDragon
ManufacturerSpaceX
Start of mission
Launch dateJune 28, 2015, 14:21:11 UTC
RocketFalcon 9 v1.1
Launch siteCape Canaveral SLC-40
ContractorSpaceX
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Inclination51.6 degrees
EpochPlanned
Berthing at ISS
Berthing portHarmony nadir
File:CRS-7 Official Mission Patch.png  

SpaceX CRS-7 was a private American rocket cargo resupply mission to the International Space Station, contracted to NASA, and launched and failed on June 28, 2015. It exploded 139 seconds into the flight after launch from Cape Canaveral, just before the first stage was to separate from the second stage.[1] It was the ninth flight for SpaceX's uncrewed Dragon cargo spacecraft and the seventh SpaceX operational mission contracted to NASA under a Commercial Resupply Services contract. The vehicle, like all Dragon spacecraft, launched on the Falcon 9 v1.1. It was the nineteenth overall flight for the Falcon 9 and the fourteenth flight for the substantially upgraded Falcon 9 v1.1.

Launch history

SpaceX CRS-7 prior to launch
The Of Course I Still Love You prior to the launch

In January 2015, the launch was tentatively scheduled by NASA for no earlier than June 13, 2015. This was adjusted to June 22, 2015, then moved forward to June 19, 2015 and adjusted again to June 26, 2015.[2] Subsequently, the launch had been rescheduled to June 28, 2015 at 14:21:11 UTC, from Cape Canaveral LC-40.[3] The launch was scheduled to be the third controlled-descent and landing test for the Falcon 9's first stage. It would have attempted to land on a new autonomous drone ship named Of Course I Still Love You – named after a ship in the novel The Player of Games by Iain M. Banks.[4] The spacecraft was planned to stay in orbit for five weeks before returning to Earth with approximately 1,400 pounds (640 kg) of supplies and waste.[4]

Payload

Primary payload

NASA contracted for the CRS-7 mission from SpaceX and therefore determined the primary payload, date/time of launch, and orbital parameters for the Dragon space capsule.

As of July 2013, the first International Docking Adapter, IDA-1, was scheduled to be delivered to the International Space Station on CRS-7.[5] This adapter would have been attached to one of the existing Pressurized Mating Adapters (specifically, PMA-2 or PMA-3) and convert the existing APAS-95 docking interface to the new NASA Docking System (NDS).[6][7] The new adapter is intended to facilitate future docking of new US human-transport spacecraft. Previous US cargo missions since the retirement of the Space Shuttle have been berthed, rather than docked, while docking is considered the safer and preferred method for spacecraft carrying humans.

Secondary payload

The mission would have carried more than 4,000 pounds (1,800 kg) of supplies and experiments to the International Space Station including the Meteor Composition Determination investigation which would have observed meteors entering the Earth's atmosphere by taking high resolution photos and videos. The Center for the Advancement of Science in Space has arranged for it to carry more than 30 student research projects to the station including experiments dealing with pollination in microgravity as well as an experiment to evaluate a solar radiation blocking form of plastic.[4]

CRS-7 would have brought a pair of modified Microsoft HoloLenses to the International Space Station as part of Project Sidekick.[8] They would have allowed astronauts to complete complex tasks more easily and aid in communication between astronauts and NASA.[9]

Launch failure

The vehicle's second stage failed due to an overpressure at T+02:19, well after max Q (at T+01:26[10]) and before first stage engine shutdown (MECO, scheduled at T+02:45).[10] The second stage developed a very large LOX leak, releasing large clouds of vapor while the first stage continued to thrust stably on course for about 9 sec, until it disintegrated at T+02:28. Aircraft were sent to the debris area in the Atlantic Ocean and an investigation is ongoing.[11][12] It was the first Falcon 9 failure in the 19 launches of the rocket type.[13] According to the founder of SpaceX, Elon Musk, on Twitter: "[The] Falcon 9 [launch vehicle] experienced a problem shortly before first stage shutdown. Will provide more info as soon as we review the data." He added: "There was an overpressure event in the upper stage liquid oxygen tank. Data suggests counterintuitive cause."[14]

Post-launch flight test

Main article: SpaceX reusable launch system development program

After the separation of the second stage, SpaceX had planned to conduct a flight test and attempt to return the nearly-empty first stage of the Falcon 9 through the atmosphere and land it on a 90-by-50-meter (300 ft × 160 ft) floating platform called the autonomous spaceport drone ship.[15]

This would have been SpaceX's third attempt to land the booster on a floating platform after earlier tests in January 2015 and April 2015 were not successful. The boosters were fitted with a variety of technologies to facilitate the flight test, including grid fins and landing legs to facilitate the post-mission test. [15][16][17]

See also

References

  1. ^ "Unmanned SpaceX rocket explodes after Florida launch". BBC News. June 28, 2015. Retrieved June 28, 2015.
  2. ^ ""Worldwide Launch Schedule"". SpaceflightNow. Retrieved June 26, 2015.
  3. ^ "NASA Opens Media Accreditation for Next SpaceX Station Resupply Launch". NASA. May 20, 2015. Retrieved May 27, 2015.
  4. ^ a b c Speck, Emilee (June 25, 2015). "SpaceX resupply launch, barge landing attempt set for Sunday". Orlando Sentinel. Retrieved June 26, 2015.
  5. ^ "Status of Human Exploration and Operations Mission Directorate (HEO)" (PDF). NASA. July 29, 2013. Retrieved March 19, 2014.
  6. ^ Hartman, Dan (July 23, 2012). "International Space Station Program Status" (PDF). NASA. Retrieved August 10, 2012.
  7. ^ Lupo, Chris (June 14, 2010). "NDS Configuration and RequirementsChanges since Nov 2010" (PDF). NASA. Retrieved August 22, 2011.
  8. ^ Alfano, Andrea (June 25, 2015). "HoloLens Is Going To Space As Sidekick In A Joint Project By NASA And Microsoft". Tech Times. Retrieved June 26, 2015.
  9. ^ Bass, Dina (June 25, 2015). "NASA to Use HoloLens on Space Station". Bloomberg. Retrieved June 26, 2015.
  10. ^ a b SpaceX CRS-7 Launch. SpaceX. June 28, 2015. Event occurs at 22:51 – via YouTube. {{cite AV media}}: Unknown parameter |timecaption= ignored (|time-caption= suggested) (help) Likewise, MECO can be seen at T+02:45.
  11. ^ "NASA TV Livestream". nasa.gov. NASA. Retrieved June 28, 2015.
  12. ^ Harwood, William (June 28, 2015). "SpaceX Falcon 9 rocket destroyed in launch mishap". CBS News. Retrieved June 28, 2015.
  13. ^ "Unmanned SpaceX rocket explodes after Florida launch". BBC News. June 28, 2015. Retrieved June 28, 2015.
  14. ^ Wattles, Jackie; Crane, Rachel (June 28, 2015). "SpaceX rocket explodes after launch". CNN Money. Retrieved June 28, 2015.
  15. ^ a b Gebhardt, Chris; Bergin, Chris (June 24, 2015). "World launch markets look toward rocket reusability". NASASpaceFlight.com. Retrieved June 26, 2015.
  16. ^ Bergin, Chris (April 3, 2015). "SpaceX preparing for a busy season of missions and test milestones". NASASpaceFlight.com. Retrieved April 4, 2015.
  17. ^ Graham, William (April 13, 2015). "SpaceX Falcon 9 scrubs CRS-6 Dragon launch due to weather". NASASpaceFlight.com. Retrieved June 26, 2015.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=SpaceX_CRS-7&oldid=669265764"