Kounotori 4

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Kounotori 4
ISS-36 HTV-4 berthing 2.jpg
HTV-4 being grappled by the SSRMS on 9 August 2013
Mission type ISS resupply
Operator JAXA
COSPAR ID 2013-040A
SATCAT № 39221
Mission duration 35 days
Spacecraft properties
Spacecraft type HTV
Start of mission
Launch date 3 August 2013, 19:48:46 (2013-08-03UTC19:48:46Z) UTC
Rocket H-IIB 304
Launch site Tanegashima Y2
Contractor Mitsubishi
End of mission
Disposal Deorbited
Decay date 7 September 2013, 06:37 (2013-09-07UTC06:38Z) UTC
Orbital parameters
Reference system Geocentric
Regime Low Earth
Perigee 281 kilometres (175 mi)
Apogee 302 kilometres (188 mi)
Inclination 51.6 degrees
Period 90.34 minutes
Epoch 5 August 2013[1]
Berthing at ISS
Berthing port Harmony nadir
RMS capture 9 August 2013, 11:22 UTC
Berthing date 9 August 2013, 15:28 UTC
Unberthing date 4 September 2013, 12:07 UTC
RMS release 4 September 2013, 16:20 UTC
Time berthed 25 days, 20 hours, 29 minutes
Cargo
Mass 5,400 kilograms (11,900 lb)
Pressurised 3,900 kilograms (8,600 lb)
Unpressurised 1,500 kilograms (3,300 lb)
← Kounotori 3 Kounotori 5

Kounotori 4, also known as HTV-4, was the fourth flight of the H-II Transfer Vehicle, an unmanned cargo spacecraft launched in August 2013 to resupply the International Space Station. It launched from Tanegashima Space Center aboard H-IIB rocket on August 3, 2013 and connected to ISS by August 9, 2013; it carried 5.4 tons of cargo.[2] Kounotori 4 undocked on September 4, 2013 and was destroyed by reentry on 7 September 2013.[3][4]

Kounotori 4 specifications[edit]

Major changes from previous HTV are:

  • Although the previous Kounotori 3 used RCS thrusters by IHI Aerospace, Kounotori 4 uses the RCS manufactured by Aerojet, similar to HTV-1 and 2. This will be the last Kounotori to use Aerojet parts, and future Kounotori are to use IHI's.
  • One of the solar panels was replaced with a sensor module to measure the surface electrical potential when berthing to ISS.[5]
  • Continued improvement of ground operation to allow more late access cargo.
  • First time for Kounotori to reenter atmosphere with unpressurized waste cargo (a NASA engineering experiment module STP-H3).
  • The orbital trajectory after departure from ISS is adjusted so that the reentry is to coincide with ISS passing over, to allow the reentry to be observed from ISS.

Cargo[edit]

Kounotori 4 carries about 5.4 tonnes of cargo, consisting of 3.9 t in pressurized compartment and 1.5 t in unpressurized compartment.

Pressurized cargo include: CANA (Cabin network system for Kibo), Stirling-Cycle Refrigerator (FROST), ISS Cryogenic Experiment Storage Box (ICE Box), i-Ball reentry data recorder, four CubeSats (Pico Dragon, Ardusat-1, Ardusat-X, TechEdSat-3), and Kirobo (robot companion for Koichi Wakata).

Unpressurized cargo are: MBSU (Main Bus Switching Units) and UTA (Utility Transfer Assembly) which are ISS system spare parts, and a NASA experiment module STP-H4 (Space Test Program - Houston 4).

Operation[edit]

Launch and rendezvous with ISS[edit]

Kounotori 4 was successfully launched atop a H-IIB carrier rocket flying from pad 2 of the Yoshinobu Launch Complex at Tanegashima at 19:48:46 UTC on 3 August 2013.

The H-IIB rocket carrying Kounotori 4 lifts off from the Tanegashima space center early on 4 August 2013 local time.

After 5.5 days of orbital manoeuvres, it arrived to Approach Initiation Point (5 km behind ISS) at 05:31, 9 August 2013 UTC,[6] and started the final approach sequence at 08:05.[7] The ISS's robotic arm SSRMS grappled Kounotori 4 at 11:22, and fastened to ISS's CBM on 16:32. All berthing operation were completed at 18:38.[8]

Operation while berthed to ISS[edit]

The ISS crew opened the hatch and entered to Pressurized Logistics Carrier at 11:11, August 10, 2013[9]

Departure from ISS and reentry to earth atmosphere[edit]

Kounotori 4 undocked from the ISS at 16:20, 4 September 2013 UTC, Karen Nyberg then used the stations Canadarm 2 to manoeuvre HTV-4 away from the station.[3]

Trajectory after the release was controlled so that the reentry coincides with ISS passing over to observe it. Japanese flight controllers have deorbited HTV-4 on 06:11, 7 September 2013 UTC, and it reentered to atmosphere around 06:37, 7 September 2013 UTC.[4]

Notes[edit]

  1. ^ McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 9 November 2013. 
  2. ^ NASA - Japanese Cargo Craft Captured, Berthed to Station (2013)
  3. ^ a b NASA (September 4, 2013). "Station Releases a White Stork and Awaits a Swan". Retrieved September 4, 2013. 
  4. ^ a b JAXA (7 September 2013). "Successful re-entry of H-II Transfer Vehicle "KOUNOTORI4" (HTV4)". Retrieved 1 December 2013. 
  5. ^ "Features of HTV4". Retrieved 29 July 2013. 
  6. ^ "KOUNOTORI4 Reaches 5km behind the ISS". JAXA. August 9, 2013. Retrieved August 15, 2013. 
  7. ^ "KOUNOTORI4 Resumes Approach to the ISS". JAXA. Retrieved August 15, 2013. 
  8. ^ "ISS Crew Completed KOUNOTORI4 Berthing Operation". JAXA. August 10, 2013. Retrieved August 15, 2013. 
  9. ^ JAXA (August 12, 2013). "ISS Crew Entered KOUNOTORI4 Pressurized Logistics Carrier (PLC). Transfer of the Exposed Pallet (EP) was Completed.". Retrieved August 15, 2013. 

References[edit]

External links[edit]