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Falcon 9 flight 20

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launch

Falcon 9 Flight 20 (also known as Orbcomm OG2 M2)[1] was a Falcon 9 space launch that occurred on 22 December 2015 at 01:29 UTC (21 December, 8:29 pm local time). It was the first time that the first stage of an orbital rocket made a successful return and vertical landing.[2][3][4][5]

The successful landing of the first stage at Landing Zone 1, near the launch site, was the end result of a five-year technology development program to develop a reusable launch system and came on a flight test that followed the primary launch mission. Following separation of the second stage, SpaceX conducted the eighth of its controlled booster descent tests of the spent first stage, the first in which the descent target location was on land, and also the first ever successful landing. Prior to this flight, SpaceX's two previous attempts at a vertical landing and booster recovery ended in failure to recover the rocket.[6][7] The success of Flight 20 marked a significant milestone en route to the company’s goal of creating a reusable rocket system that would significantly reduce the cost of launching payloads into orbit.[8][9]

Falcon 9 Flight 20 was the first launch of the substantially upgraded Falcon 9 full thrust version of the Falcon 9 launch vehicle. It carried 11 Orbcomm-OG2 satellites to Earth orbit.

The launch was also notable as it was the first SpaceX launch following the catastrophic failure of a Falcon 9 v1.1 launch vehicle's second stage on Falcon 9 Flight 19 in June 2015.

Launch schedule history

SES announced[10] in February 2015 that it would provide the payload on the first launch of the revised-design Falcon 9 v1.2 (also called Falcon 9 v1.1 Full Thrust[11]). At the time, SES expected its SES-9 geostationary communications satellite would launch by September 2015.[12] SES kept the decision despite the loss of the launch vehicle and payload of another SpaceX mission in June 2015, but postponed the launch until late 2015.[13]

On 16 October 2015, after considering all options, SpaceX announced a change: Orbcomm's 11 OG2 satellites would be the payload on the return-to-flight launch of the redesigned Falcon 9 instead of SES-9.[12] The Orbcomm payload with its lower orbit would allow SpaceX to test relighting the second-stage engine, a capability required to successfully put the heavier SES-9 on a geostationary orbit.[12] The launch was delayed to mid-December or later, while SES-9 was scheduled to follow within a few weeks.[12]

A required pre-launch static-fire test was initially scheduled for 16 December, but a few issues emerged with the new processes required for the colder propellants for the launch vehicle and the related ground support equipment. The test was successfully carried out on 18 December, which resulted in a launch delay of one day to 19 December (local time).[14] The launch was subsequently delayed an additional day after statistical analysis indicated a somewhat higher probability of recovering the booster on the later date.[15]

New launch vehicle

Falcon 9 Flight 20 first stage's successful landing on land in December 2015

The Falcon 9 full thrust launch vehicle used on Flight 20 had a number of significant modifications from the previous Falcon 9 v1.1 vehicle. These included:[13]

Launch and on-orbit test

Flight 20 launched on 22 December 2015 at 01:29 UTC (21 December, 8:29 pm local time).

Second stage re-ignition

Following successful launch and deployment of the OG2 satellites, the Merlin Vacuum (1D) second-stage engine successfully re-ignited, demonstrating its capability to launch SES-9 into geostationary transfer orbit. The engine burn de-orbited the second stage as planned for a destructive re-entry, preventing it from becoming space debris.[17]

Payload

The payload on Flight 20 was 11 Orbcomm-OG2 second-generation satellites[12] which will provide enhanced ORBCOMM messaging capabilities, increased data capacity, and automatic identification systems (AIS) service.[18] All 11 satellites were successfully deployed by the Falcon 9 second stage, beginning approximately 14 minutes after takeoff. All 11 satellites successfully checked in with ground control stations.[2]

The satellites were placed by the launch vehicle "within a fraction of a degree in inclination and 5 kilometers (3.1 mi) in altitude of the intended orbit," and by 9 January, were in the middle of on-orbit testing, while executing propulsion maneuvers that had spread the 11 satellites over a 6,400-kilometer (4,000 mi) orbital arc.[19] Initial ORBCOMM customer message traffic began to be tested by late January.[20]

Satflare reported in February 2016 that one of the 11 flight 2 satellites will reenter Earth's atmosphere in late-February 2016.[21][needs update]

The satellite manufacturer, Sierra Nevada, completed checkout work and handed all 11 satellites off to ORBCOMM in early March.[22][23]

Post-mission landing

Main article: SpaceX reusable launch system development program

SpaceX performed a controlled-descent test on the rocket's first stage—the eighth propulsive return test of the series. For the first time, SpaceX was able to vertically land and successfully recover the first stage.[24] Earlier tests had proven the high-altitude deceleration and atmospheric re-entry portions of the test protocol, but no landing attempt had previously been successful, including two attempts earlier in 2015 to land a first stage on a floating landing platform.[25]

The entire controlled-descent through the atmosphere and landing attempt is an arrangement that is unusual for other launch vehicles.[26] The flight test was planned for the twentieth Falcon 9 launch, even after the manifested payload was switched from SES-9 to the 11-satellite Orbcomm OG-2 payload.[27] The test was scheduled for and successfully carried out on December 21, 2015, when the first stage landed intact at Landing Zone 1.[3][25]

SpaceX does not plan to fly the Falcon 9 Flight 20 first stage again.[28] Rather, the rocket was moved a few miles north to Launch pad 39A, recently refurbished by SpaceX at the adjacent Kennedy Space Center, to conduct a static fire test. This test aimed to assess the health of the recovered booster and the capability of this rocket design to fly repeatedly in the future.[29][25]

Evaluation of the recovered first stage

On 31 December, SpaceX announced that no damage had been found on the stage and that it was ready to perform a static fire again.[30][31] SpaceX had initially moved the booster to their hangar at LC 39A, but they moved the stage to LC 40—the pad from which it was launched—on 12 January.[32] On 15 January 2016, SpaceX conducted the static fire test on the recovered booster, obtaining good overall results except for one of the outer engines experiencing thrust fluctuations.[29] Elon Musk reported that this may have been due to debris ingestion.[33][34]

In February 2016, SpaceX President and COO Gwynne Shotwell indicated that some unspecified modifications to the stage design would occur as a result of the booster's post-flight evaluation and static fire.[35]

Live coverage

SpaceX live coverage of the launch and landing included cheering crowds and tours of the SpaceX manufacturing and launch facilities.[36] The successful landing of the first stage was accompanied by the SpaceX lead landing engineer announcing "The Falcon has Landed."[37][38]

See also

References

  1. ^ "2015 U.S. Space Launch Manifest". americaspace.com. AmericaSpace, LLC. 21 December 2015. Retrieved 21 December 2015.
  2. ^ a b Jeff Foust (21 December 2015). "Falcon 9 Launches Orbcomm Satellites, Lands First Stage". SpaceNews. Retrieved 22 December 2015. the first time SpaceX had successfully landed the rocket's first stage.
  3. ^ a b Stephen Clark (10 December 2015). "SpaceX eyes Dec. 19 for first launch since June". Retrieved 10 December 2015.
  4. ^ "SpaceX Shooting for a Dec. 19 Falcon Return-to-flight Launch". SpaceNews. 10 December 2015. Retrieved 10 December 2015.
  5. ^ "SpaceX Makes History: Falcon 9 Launches, Lands Vertically". 22 December 2015. Retrieved 28 December 2015.
  6. ^ Kramer, Miriam (12 January 2015). "SpaceX's Elon Musk Says Rocket Landing Test Ran Out of Hydraulic Fluid". Space.com. Retrieved 20 January 2015.
  7. ^ Guy Norris (16 April 2015). "SpaceX Checks Throttle Valve After Flawed Falcon 9 Recovery Attempt".
  8. ^ "In historic first, SpaceX lands first reusable rocket". Al Jazeera. 22 December 2015. Retrieved 30 December 2015.
  9. ^ Simberg, Rand (7 February 2012). "Elon Musk on SpaceX's Reusable Rocket Plans". Popular Mechanics. Retrieved 30 December 2015.
  10. ^ Clark, Stephen (20 February 2015). "SES signs up for launch with more powerful Falcon 9 engines". Spaceflight Now. Retrieved 8 May 2015.
  11. ^ Svitak, Amy (17 March 2015). "SpaceX's New Spin on Falcon 9". Aviation Week. Aviation Week Network. Retrieved 24 October 2015.
  12. ^ a b c d e de Selding, Peter B. (16 October 2015). "SpaceX Changes its Falcon 9 Return-to-flight Plans". SpaceNews. Retrieved 16 October 2015.
  13. ^ a b Foust, Jeff (15 September 2015). "SES Betting on SpaceX, Falcon 9 Upgrade as Debut Approaches". Space News. Retrieved 19 September 2015.
  14. ^ "No Dec. 19 launch for SpaceX Falcon 9 v1.2". SpaceFlight Insider. Retrieved 17 December 2015.
  15. ^ "SpaceX Now Planning Monday Launch and Landing - SpaceNews.com". SpaceNews.com. Retrieved 22 December 2015.
  16. ^ https://twitter.com/elonmusk/status/669132749500887040
  17. ^ Clark, Stephen. "Round-trip rocket flight gives SpaceX a trifecta of successes | Spaceflight Now". Retrieved 22 December 2015.
  18. ^ Messier, Doug (27 December 2012). "Orbcomm, SpaceX Reach New Launch Agreement on OG2 Satellite Launch". parabolicArc. Retrieved 1 February 2013. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  19. ^ OG2 Mission 2 Launch Update, ORBCOMM, 8 January 2016, accessed 10 January 2016.
  20. ^ "OG2 Update: Satellite Successfully Processes Customer Message Traffic". 28 January 2016. Retrieved 6 February 2016. In-orbit testing continues to progress well. Yesterday, we turned on one of our OG2 satellites and started successfully processing customer message traffic. We will continue testing this single satellite for the next several days. We expect to move forward with multi-satellite testing next week.
  21. ^ "ONLINE SATELLITE AND FLARE TRACKING". Satflare. 24 February 2015. Archived from the original on 24 February 2015. Retrieved 24 February 2016. WARNING: This object is expected to decay around Thu, 25/02/2016 UTC {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; 24 February 2016 suggested (help); Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  22. ^ [1]
  23. ^ Sierra Nevada: We have handed to Orbcomm operational control of all 11 OG2 sats launched in December, Peter B DeSelding of Space News, 6 March 2016]
  24. ^ "SpaceX ORBCOMM-2 Mission" (PDF). press kit. SpaceX. 21 December 2015. Retrieved 21 December 2015. This mission also marks SpaceX's return-to-flight as well as its first attempt to land a first stage on land. The landing of the first stage is a secondary test objective.
  25. ^ a b c Gebhardt, Chris (31 December 2015). "Year In Review, Part 4: SpaceX and Orbital ATK recover and succeed in 2015". NASASpaceFlight.com. Retrieved 1 January 2016.
  26. ^ "SpaceX wants to land next booster at Cape Canaveral". Florida Today. 1 December 2015. Retrieved 4 December 2015.
  27. ^ SpaceX preparing for Static Fire test on first Full Thrust Falcon 9 First Stage, October 24, 2015, accessed October 26, 2015.
  28. ^ O'Kane, Sean (21 December 2015). "SpaceX's 'reusable' Falcon 9 rocket won't fly again, Elon Musk says". The Verge. Retrieved 23 December 2015.
  29. ^ a b "Returned falcon 9 booster fires up for static fire test". Spaceflight 101. 15 January 2016. Retrieved 18 January 2016.
  30. ^ "SpaceX Reports No Damage to Falcon 9 First Stage After Landing". 3 January 2016. Retrieved 4 January 2016.
  31. ^ Falcon 9 back in the hangar at Cape Canaveral. No damage found, ready to fire again., Elon Musk, via Twitter, 31 December 2015, accessed 2 January 2016.
  32. ^ Dean, James (13 January 2016). "SpaceX poised to test-fire landed Falcon rocket's engines". Florida Today. Retrieved 14 January 2016.
  33. ^ "SpaceX Tests Recovered Falcon 9 Stage and Prepares for Next Launch". 15 January 2016. Retrieved 15 January 2016.
  34. ^ Falcon 9 booster fires again at Cape Canaveral, Spaceflight Now, 16 January 2016, accessed 18 January 2016.
  35. ^ Foust, Jeff (4 February 2014). "SpaceX seeks to accelerate Falcon 9 production and launch rates this year". SpaceNews. Retrieved 6 February 2016. The latest changes, [Shotwell] said, came after a static fire test of the first stage Jan. 15 at Cape Canaveral. "We fired it up, and actually learned something about the rocket," she said, without elaborating on what the company learned. "We're going to make some mods based on what we saw on that stage landing and firing."
  36. ^ Robinson Meyer (23 December 2015). "When a Rocket Launch Is a Cultural Event: SpaceX's online broadcast brought a different tone to space exploration". The Atlantic. Retrieved 24 December 2015.
  37. ^ SpaceX (12 January 2016). "'The Falcon has landed' - Recap of Falcon 9 launch and landing". Youtube.
  38. ^ TMRO (2 January 2016). "'LZ-1, The Falcon Has Landed' - 9.01". Youtube.
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