HTV-1

HTV-1, also known as the HTV Demonstration Flight [4] or HTV Technical Demonstration Vehicle,[5] was the first Japanese Space Agency (JAXA) H-II Transfer Vehicle, launched in September 2009 to resupply the International Space Station and support the JAXA Kibō (きぼう, Kibō, Hope) laboratory or JEM. It was an uncrewed cargo spacecraft carrying a mixture of pressurised and unpressurised cargo to the International Space Station. After a 52-day successful mission, HTV departed the ISS on 31 October 2009 after being released by the station's robotic arm. The spacecraft re-entered the Earth's atmosphere on 1 November 2009 and disintegrated on re-entry as planned.

For the hypersonic prototype, see DARPA Falcon Project.

HTV-1

HTV-1 before berthing
Mission type	ISS resupply
Operator	JAXA
COSPAR ID	2009-048A
SATCAT no.	35817
Mission duration	52 days
Spacecraft properties
Spacecraft type	HTV
Launch mass	16000 kg
Start of mission
Launch date	10 September 2009 17:01:46 UTC
Rocket	H-IIB 304 (F1)
Launch site	Tanegashima, Yoshinobu-2
Contractor	Mitsubishi
End of mission
Disposal	Deorbited
Decay date	1 November 2009, 21:26 UTC
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Altitude	347 km
Inclination	51.6°
Epoch	17 september 2009
Berthing at ISS
Berthing port	Harmony
Berthing date	17 September 2009 22:26 UTC [1]
Unberthing date	30 October 2009, 15:02 UTC [2]
RMS release	30 October 2009
Time berthed	43 days
Cargo
Mass	4500 kg [3]
Pressurised	3600 kg
Unpressurised	900 kg
Fuel	2432 kg
HTV ISS Resupply

Payloads

HTV-1 carried 4,500 kilograms (9,900 lb) tonnes of payload, lower than the 6,000 kilograms (13,000 lb) maximum payload of the HTV in order to allow the spacecraft to carry additional propellant and batteries for the in-orbit verification phase of the flight.[6][7]

In the Unpressurised Logistics Carrier, the HTV-1 carried SMILES (Superconducting Submillimetre-Wave Limb Emission Sounder) and HREP (HICO-RAIDS Experiment Payload), which both were installed in the JEM Exposed Facility on the ISS.[8]

The Pressurised Logistics Carrier carried 3,600 kilograms (7,900 lb) of supplies for the International Space Station.[6][9] It consisted of food (33% of weight), laboratory experiment materials (20%), robot arm and other hardware for JEM (18%), crew supplies including garments, toiletries, personal mail and photographs, fluorescent lights, waste buckets (10%), and packing materials (19%).[10]

Carrier rocket

HTV-1 was launched on the maiden flight of the H-IIB carrier rocket. The H-IIB 304 configuration was used, with a type 5S-H payload fairing.[11] Before launch, two Captive Firing Tests were conducted on the rocket which was to launch HTV-1. The first test, which consisted of firing the first stage for ten seconds, was originally scheduled to occur at 02:30 UTC on 27 March 2009, however, it was cancelled after the launch pad's coolant system failed to activate.[12] This was later discovered to have been due to a manual supply valve not being open.[13] The test was rescheduled for 1 April 2009, but then postponed again due to a leak in a pipe associated with the launch facility's fire suppression system.[14] The test was rescheduled for 2 April,[15] when it was successfully conducted at 05:00 UTC.[16]

Following this, the second test, which involved a 150-second burn of the first stage, was scheduled for 20 April.[17] This was successfully conducted at 04:00 UTC on 22 April,[18] following a two-day delay due to unfavourable weather conditions.[19] A ground test, using a battleship mockup of the rocket was subsequently conducted on 11 July.[20]

Operation

Launch and rendezvous with ISS

Approach to the ISS

HTV-1 before capture

HTV-1 was successfully launched at 17:01:46 UTC on 10 September 2009, to the initial orbit of 199.8 kilometres (124.1 mi) of perigee, a apogee of 299.9 kilometres (186.3 mi), an inclination of 51.69° (planned 200 kilometres (120 mi) ± 10 kilometres (6.2 mi) / 300 kilometres (190 mi) ± 2 kilometres (1.2 mi) / 51.67° ± 0.15°).[21][22] The launch took place from the Yoshinobu Launch Complex at the Tanegashima Space Centre, and was the first to use the second pad of the complex.[11]

Flight operations are chronicled using Flight Day (FD), the ISS crew timeline.[6] Arrival of HTV-1 occurred during Expedition 20, (Gennady Padalka, Commander, Michael Barratt, Nicole Stott, Frank De Winne, Roman Romanenko, and Robert Thirsk). Expedition 21 supervised the departure of HTV-1, (Frank De Winne, Commander, Roman Romanenko, Robert Thirsk, Maksim Surayev, Jeffrey Williams, and Nicole Stott). The station was visited by Spaceflight Participant Guy Laliberté. No Japanese astronaut was present during the attached phase of the HTV-1 to the ISS. The launch day is FD1. On FD3 (September 12), HTV-1 performed the demonstration tests of ISS proximity operation such as collision avoidance manoeuvre. It went successfully and on FD6, ISS Mission Management Team approved the final approach.[23]

On 17 September 2009, HTV-1 rendezvoused with the International Space Station.[24] It arrived at the Approach Initiation Point, 5 kilometres (3.1 mi) behind the space station at 13:59 UTC, and began its final approach sequence at 15:31.[25] It approached to within 10 metres (33 ft) of the station, from where it was grappled using the Canadarm2 robotic arm of the space station, operated by Nicole Stott. Initial capture occurred at 19:47 UTC, with the procedure being completed at 19:51.[26] Robert Thirsk then used Canadarm2 to move it to a "ready-to-latch" position over the nadir CBM port of the Harmony module. It arrived at this position at 22:08 UTC, and by 22:12 four latches had engaged to hold it in place. Sixteen bolts were subsequently driven in to achieve a hard mate.[27] It remained berthed at the station until 30 October 2009.[28]

Departure from the ISS and re-entry

Expedition 21 crew members, Nicole Stott, Robert Thirsk, and Frank De Winne completed the final steps of preparing for HTV's release from the ISS. These steps included disconnecting the final remaining power jumper line, closing the Node-2 nadir hatch, depressurizing the vestibule and performing leak checks, removing Common Berthing Mechanism bolts and deploying latches and unberthing the HTV-1 with the Space Station Remote Manipulator System.[29]

While passing above the Pacific Ocean, the robotic arm of the space station released the HTV-1 positioned at 12 kilometres (7.5 mi) below the station on 30 October 2009. The departure was delayed for one ISS orbit to avoid debris (Kosmos 2421).[30][31] HTV-1 was loaded with 199 items of discarded equipment and waste of 727.7 kilograms (1,604 lb), as well as 896 kilograms (1,975 lb) empty racks, totaling 1,624 kilograms (3,580 lb).[31] At 17:32 (UTC), HTV-1 was released from SSRMS and began its planned maneuvers to leave the station proximity. HTV-1 gradually departed from the ISS orbit by performing several thruster burns and entered to its solo-flight mode.

The HTV flight control team sent commands for three engine burns at 14:55, at 16:25, and at 20:53, on 1 November 2009 (UTC) to prepare the vehicle's destruction in Earth's atmosphere. The first de-orbit engine burn lasted for approximately 8 minutes and was completed at 15:03, on 1 November 2009. The second de-orbit engine burn lasted for approximately 9 minutes and was completed at 16:34. Following the second de-orbit maneuver, the HTV-1 was inserted into an elliptic orbit with an altitude of a perigee of 143 kilometres (89 mi) and an apogee of 335 kilometres (208 mi).

HTV-1 began the third and final de-orbit maneuver at 20:53 on 1 November 2009 as planned, while the spacecraft was passing over Central Asia. The maneuver that lasted for about 8 minutes was successfully wrapped up at 21:01 as the spacecraft flew near the southern half of Japan. According to the Japan Aerospace Exploration Agency, HTV-1's atmospheric re-entry occurred at 21:25 UTC at 120 km above and over the Pacific Ocean just off the coast of New Zealand. The fiery re-entry and disintegration in the Earth's atmosphere marked the successful completion of the HTV-1's 52-day mission.

It is believed that some of the surviving debris from the HTV would have likely fallen in a rectangular area stretching across the Pacific Ocean between New Zealand and South America, according to the Japan Aerospace Exploration Agency.[32]

Gallery

• 
  The H-IIB lifts off from the Tanegashima Space Center carrying HTV-1 in 2009.
• 
  The view of HTV-1 through the CBM port. MPLM on the harmony module refers to a cargo container that uses the same berth.
• 
  The NASA astronaut Nicole Stott working inside HTV-1 8 days later, with some supplies already removed.
• 
  The NASA astronaut Nicole Stott moving a storage container inside HTV-1.
• 
  A HTV-1 demo photographed from the Netherlands by astrophotographer Ralf Vandebergh.
• 
  HTV-1 can be berthed on top, Zenith, or bottom, Nadir (shown), of Harmony.
• 
  Canadarm2 captures HTV-1
• 
  The ISS Expedition 20 crew members entering HTV-1.

See also

• Automated Transfer Vehicle
• H-II Transfer Vehicle
• Progress (spacecraft)
• Dragon
• Cygnus (spacecraft)
• List of uncrewed spaceflights to the ISS

References

1. Stephen Clark (17 September 2009). "Japanese cargo ship snagged by space station robot arm". spaceflightnow.com. Retrieved 3 November 2009.
2. Stephen Clark (30 October 2009). "HTV cargo ship departs International Space Station". spaceflightnow.com. Retrieved 3 November 2009.
3. https://iss.jaxa.jp/en/htv/mission/htv-2/library/presskit/htv2_presskit_en.pdf - Revision A
4. "HTV/H-IIB Special Site". JAXA. Retrieved 12 August 2009.
5. "HTV Overview". JAXA. Retrieved 12 August 2009.
6. "HTV-1 Mission Press Kit" (PDF). JAXA. 9 September 2009. Retrieved 11 September 2009.
7. "HTV-1:宇宙ステーション補給機" (in Japanese). JAXA. Retrieved 2 September 2009.
8. "JFY 2009 Summer Launch Season Launch/Operation and Control Plans for HTV/H-IIB TF1" (PDF). Retrieved 1 September 2009.
9. 搭載品:宇宙ステーション補給機 (in Japanese). JAXA. 27 August 2009. Retrieved 2 September 2009.
10. Yoshihiko Torano (9 July 2009). "宇宙ステーション補給機（HTV" (PDF) (in Japanese). JAXA. Archived from the original (PDF) on 26 May 2013. Retrieved 11 August 2012.
11. Krebs, Gunter. "H2 Family". Retrieved 11 August 2009.
12. "Postponement of the First Captive Firing Test (CFT) of the First Stage Flight Model Tank for the H-IIB Launch Vehicle". JAXA. 27 March 2009. Retrieved 12 August 2009.
13. "The First Captive Firing Test for the First Stage Flight Model Tank for the H-IIB Launch Vehicle". JAXA. 30 March 2009. Retrieved 12 August 2009.
14. "Suspension of the First Captive Firing Test (CFT) of the First Stage Flight Model Tank for the H-IIB Launch Vehicle". JAXA. 1 April 2009. Retrieved 12 August 2009.
15. "The First Captive Firing Test for the First Stage Flight Model Tank for the H-IIB Launch Vehicle". JAXA. 1 April 2009. Retrieved 12 August 2009.
16. "Result of the First Captive Firing Test for the First Stage Flight Model Tank of the H-IIB Launch Vehicle". JAXA. 2 April 2009. Retrieved 12 August 2009.
17. "The Second Captive Firing Test for the First Stage Flight Model Tank for the H-IIB Launch Vehicle". JAXA. 17 April 2009. Retrieved 12 August 2009.
18. "Result of the Second Captive Firing Test for the First Stage Flight Model Tank of the H-IIB Launch Vehicle". JAXA. 22 April 2009. Retrieved 12 August 2009.
19. "Postponement of the Second Captive Firing Test (CFT) of the First Stage Flight Model Tank for the H-IIB Launch Vehicle". JAXA. 19 April 2009. Retrieved 12 August 2009.
20. "Results of the H-IIB Launch Vehicle Ground Test Vehicle (GTV) Test". JAXA. 11 July 2009. Retrieved 12 August 2009.
21. "Launch Result of HTV Demonstration Flight aboard H-IIB Launch Vehicle Test Flight (H-IIB TF1)" (Press release). JAXA / MHI. 11 September 2009. Retrieved 15 September 2009.
22. "H-IIBロケット試験機による宇宙ステーション補給機（HTV）技術実証機の打上げ結果について（速報" (PDF). 16 September 2009. Retrieved 16 September 2009.
23. "HTV-1 Approved for Proximity Operations and Final Approach". 15 September 2009. Retrieved 15 September 2009.
24. "ISS On-Orbit Status 09/09/09". NASA. 9 September 2009. Retrieved 10 September 2009.
25. "News:H-II Transfer Vehicle". JAXA. Retrieved 17 September 2009.
26. "HTV-1 captured by the station's robotic arm". 18 September 2009. Retrieved 18 September 2009.
27. "Mission Status Center". HTV Mission Report. Spaceflight Now. Retrieved 17 September 2009.
28. "ISS On-Orbit Status 10/20/09". NASA. 20 October 2009. Retrieved 22 October 2009.
29. "ISS On-Orbit Status 10/30/09". NASA.gov. 30 October 2009. Retrieved 3 November 2009.
30. "ISS On-Orbit Status 10/29/09". NASA. Retrieved 8 November 2009.
31. "宇宙ステーション補給機（HTV）技術実証機の国際宇宙ステーション（ISS）離脱及び再突入結果について" (PDF) (in Japanese). JAXA. 4 November 2009. Retrieved 8 November 2009.
32. Stephen Clark (1 November 2009). "History-making Japanese space mission ends in flames". spaceflightnow.com. Retrieved 3 November 2009.

External links

• Official website