Kounotori 3 approaches the ISS on 27 July 2012
|Mission type||ISS resupply|
|Launch mass||19,000 kilograms (42,000 lb)|
|Start of mission|
|Launch date||21 July 2012, 02:06:18UTC|
|Launch site||Tanegashima Yoshinobu-2|
|End of mission|
|Decay date||14 September 2012, 05:27UTC|
|Berthing at ISS|
|Berthing port||Harmony nadir|
|RMS capture||27 July 2012, 12:23 UTC|
|Berthing date||27 July 2012, 14:34 UTC|
|Unberthing date||11 September 2012, 11:50 UTC|
|RMS release||12 September 2012, 15:50 UTC|
|Mass||4,600 kilograms (10,100 lb)|
Kounotori 3 (Japanese: こうのとり3号機; English: "white stork"), also known as HTV-3, is the third Japanese H-II Transfer Vehicle. It was launched on 21 July 2012 to resupply the International Space Station (ISS) aboard the H-IIB Launch Vehicle No. 3 (H-IIB F3) manufactured by MHI and JAXA. Kounotori 3 arrived at the ISS on 27 July 2012, and Expedition 32 Flight Engineer and JAXA astronaut Akihiko Hoshide used the International Space Station’s Canadarm2 robotic arm to install Kounotori 3, to its docking port on the Earth-facing side of the Harmony module at 14:34 GMT.
After the supplies are unloaded, Kounotori 3 was loaded with waste material from ISS, including used experiment equipment and used clothes.Then Kounotori 3 was unberthed from the ISS on September 11 and burned up upon reentering the atmosphere on September 14, 2012.
Kounotori 3 specifications
- Change of thrusters to the ones by IHI Aerospace: 500 N class HBT-5 and 120 N class HBT-1 thrusters
- Change of communication equipment
- First use of EP-MP (Exposed Pallet - Multi-Purpose)
- a re-designed pallet that is somewhat lighter than the previous ones
- Simplification of Exposed Palette holding mechanism
Ground operation was improved to allow more late access cargo.
Kounotori 3 carries approximately 4.6 tonnes cargo, consisting of 3.5 tonnes in pressurized compartment and 1.1 tonnes in unpressurized compartment.
Pressurized cargo consists of system equipment (61%), science experiments (20%), food (15%), and crew commodities (4%). It includes: Aquatic Habitat (AQH), JEM Small-Satellite Orbital Deployer (J-SSOD), five CubeSats (RAIKO, FITSAT-1, WE WISH, F-1, TechEdSat), i-Ball and REBR reentry data recorders, ISS SERVIR Environmental Research and Visualization System (ISERV). Additionally, loaded onto Kounotori 3's Resupply Racks was NASA’s Water Pump Assembly (WPA) catalytic reactor to replace the former unit that broke in March 2012 in orbit and a cooling water circulation pump to replace the old unit in the Japanese Experiment Module (Kibo) that also broke at the end of March.
The high-tech aquarium (AQH) can be used to house small fish for up to 90 days. "As a result, aquatic breeding over three generations, from fish parents to grandkids, previously impossible in space shuttle experiments, has become a reality," NASA said in a press kit. The AQH experimental device will allow scientists and researchers to observe the birth of space aquatic creatures that have never experienced Earth's gravity, enabling them to better understand how the space environment affects animals beyond generations in preparation for potential long-term space travel in future. Medaka (Oryzias latipes) will be bred and observed in the AQH experimental device.
The J-SSOD and five CubeSats are part of an technology experiment to test the feasibility of whether small satellites can be released without spacewalks. Using this method, satellites contained in bags will be launched facilitating future satellite design.
During the destructive re-entry at the end of the Kounotori 3 mission, i-Ball will attempt to collect re-entry data. The globular- shaped i-Ball, a Re-entry Data Recorder produced in Japan, will descend using a parachute after withstanding the high heat of re-entry using ablative shielding and will send data after splashdown via an Iridium satellite. Although i-Ball will stay afloat for a while for data transmission, it will sink in the water eventually and will not be recovered.
Kounotori 3 was launched aboard H-IIB rocket from Tanegashima Space Center at 02:06:18 UTC (11:06:18 JST) on 21 July 2012. The rocket flew smoothly arching out over the Pacific Ocean on a southeasterly trajectory 51.6 degrees titled to the Equator. Two minutes after liftoff, the four strap-on solid rocket boosters separated from the launch vehicle and fell away in pairs as planned. The second stage then ignited and continued the push Kounotori 3 to orbit. Four minutes into the flight the H-IIB jettisoned the payload fairing and the first stage. After igniting the second stage engine, the H-IIB inserted Kounotori 3 into its preferred initial orbit with separation confirmed at 14 minutes and 53 minutes after liftoff. Following the successful separation of Kounotori 3, the second stage engines were re-ignited for another time to perform a controlled re-entry test. The second stage dropped into the South Pacific Ocean shortly afterwards. There were no apparent launch problems during the entire flight of the H-IIB rocket.
At the time of the H-IIB launch, the weather was rainy, a wind speed was 2.3 m/s from the west-northwest and the temperature was 27.1 °C.
In orbit, Kounotori 3 began a week-long phasing period where its orbit was gradually adjusted. Kounotori 3 rendezvous burns were performed using four newly designed Japanese engines, as the two previous HTVs used engines made by US company Aerojet. During the same period Kounotori 3 under went a series of pre-docking tests to precisely align the spacecraft with the ISS.
The capture and berthing operations of HTV-3 took place on 27 July 2012. Upon reaching the communications zone, the spacecraft began to use the Proximity Operations system located in the JEM module on the ISS, to communicate with the station. Once Kounotori 3 was within about 30 feet and began stationkeeping, Mission Control in Houston issued the space station crew the "GO" for capture of the spacecraft with the robotic arm of the space station. That command was radioed up by CAPCOM Catherine Coleman, who actually performed the capture of Kounotori 2 in 2011.
Kounotori 3 was placed into free-drift and NASA astronaut Joseph Acaba, operating the station's robot arm, locked onto a grapple fixture at 12:23 GMT. JAXA astronaut and flight engineer of Expedition 32/33 Akihiko Hoshide then resumed berthing operations, moving the spacecraft to the nadir port (Earth facing) of the space station's Harmony module. This marked the first time that a Japanese astronaut assisted in the capture of a Japanese spacecraft. Sixteen remotely controlled bolts were gradually electrically driven in the common berthing mechanism at 14:24 GMT to finish the attachment of Kounotori 3 to the ISS at 14:34 GMT.
Expedition 32 crew members opened the hatch of Kounotori 3 at 08:23 UTC on July 28, 2012 and entered Kounotori 3's Pressurized Logistics Carrier (PLC) to begin removing cargo supplies from inside the PLC.
The Exposed Pallet, which carried MCE and SCaN Testbed, was extracted by ISS's robotic arm from Kounotori's Unpressurized Logistics Carrier and moved to the Kibo's Exposed Facility on August 6. After MCE and SCaN Testbed are removed from the palette and installed to their places on ISS, Exposed Palette was returned to Kounotori on August 10.
Departure and reentry to Earth atmosphere
Kounotori 3 was scheduled to be detached on September 6, but was postponed due to the scheduling of ISS activity.
In preparation for unberthing, REBR and i-Ball reentry data recorders were installed and activated, and the hatch was closed on September 11.
Kounotori 3 was unberthed by SSRMS at 11:50 UTC, 11 September, and released at 15:50 UTC, 12 September. A few minutes after release when leaving from ISS, Kounotori 3 entered abort sequence, quickly leaving to fore of ISS orbit instead of the nominal gradual lower-fore trajectory. SpaceFlightNow reported that it was triggered by a failure of In/Out Computer 2, citing daily space station status report posted on a NASA website. NASA's ISS On-Orbit Status does not mention any non-nominal event. At the press briefing, HTV Flight Director Takashi Uchiyama said that it was activated due to the residual motion of HTV after the release by SSRMS, which was considered to exceed the free fall bounding box before nominal activation of departure manoeuvre. Later, Aviation Week reported that it was caused by the friction between Kounotori's grapple fixture and the station's robotic arm.
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