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Kagoshima Satellite
Mission typeTechnology demonstration
Atmospheric research
OperatorKagoshima University
COSPAR ID2010-020A Edit this at Wikidata
SATCAT no.36573
Mission duration55 days (achieved)
Spacecraft properties
Bus1U CubeSat
ManufacturerKagoshima University
Launch mass1.43 kg (3.2 lb)
Dimensions10 cm × 10 cm × 10 cm (3.9 in × 3.9 in × 3.9 in)
Power2 deployable fixed solar panels, solar cells and batteries
Start of mission
Launch date20 May 2010, 21:58:22 UTC
RocketH-IIA (202) (# 17)
Launch siteTanegashima, Yoshinobu 1
ContractorMitsubishi Heavy Industries
End of mission
Last contact1 June 2010 [1]
Decay date14 July 2010 [2]
Orbital parameters
Reference systemGeocentric orbit[3]
RegimeLow Earth orbit
Perigee altitude299.1 km (185.9 mi)
Apogee altitude299.6 km (186.2 mi)
Period90.5 minutes

Hayato, known before launch as KSAT, or the Kagoshima Satellite, is a Japanese satellite which was launched on 20 May 2010. It is a student-built spacecraft, which is operated by Kagoshima University, and is being used for technology demonstration and atmospheric research.[4] The satellite is a single unit CubeSat, and carries equipment to study water vapour in the Earth's atmosphere, microwave imagery and spacecraft communication.[4][5]


The launch was conducted by Mitsubishi Heavy Industries under contract to the Japan Aerospace Exploration Agency (JAXA). In preparation for a planned launch on 17 May 2010, the H-IIA launch vehicle was rolled out to Pad 1 of the Yoshinobu Launch Complex at the Tanegashima Space Center on 16 May 2010. It departed the assembly building at 21:01 UTC and arriving at the launch pad 24 minutes later at 21:25 UTC.[6] The terminal countdown began at 11:30 UTC on 17 May 2010 and by 15:28 UTC, the loading of cryogenic propellant into the rocket's first and second stages had been completed.[6] The launch attempt was scrubbed a few minutes before liftoff due to bad weather, but took place successfully at 21:58:22 UTC on 20 May 2010.


Hayato was deployed from a JAXA Picosatellite Deployer attached to the second stage of the H-IIA launch vehicle used in the launch of the Akatsuki spacecraft towards Venus. KSAT shared its dispenser with the Negai satellite, whilst a second dispenser contained Waseda-SAT2. The three CubeSats separated into low Earth orbit during a coast phase of the launch, between the first and second burns of the second stage. The launch vehicle then continued to heliocentric orbit, where it deployed Akatsuki, along with the IKAROS and UNITEC-1 spacecraft.[7] Contact with the satellite was established for 12 days only.[1]

See also


  1. ^ a b "KSAT (Hayato) Project". Kagoshima University. 6 September 2011. Archived from the original on 14 April 2014. Retrieved 24 October 2021.
  2. ^ "Information furnished in conformity with the Convention on Registration of Objects Launched into Outer Space" (PDF). Committee on the Peaceful Uses of Outer Space. 25 July 2011. Retrieved 24 October 2021.
  3. ^ "Launch Log". Jonathan's Space Report. 21 July 2021. Retrieved 24 October 2021.
  4. ^ a b Krebs, Gunter (11 December 2017). "KSAT (Hayato)". Gunter's Space Page. Retrieved 24 October 2021.
  5. ^ "鹿児島人工衛星開発部会 プロジェクト". Kagoshima University. Archived from the original on 15 May 2010. Retrieved 24 October 2021.
  6. ^ a b "Countdown Report". H-IIA Launch Services Flight 17. Mitsubishi Heavy Industries. Archived from the original on 9 August 2016. Retrieved 17 May 2010.
  7. ^ "Overview of Secondary Payloads". Akatsuki Special Site. JAXA. Retrieved 17 May 2010.