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Mission typeTechnology
OperatorSoka University
COSPAR ID2010-020C Edit this at Wikidata
SATCAT no.36575
Mission duration37 days
Spacecraft properties
Spacecraft type1U CubeSat
Launch mass1 kilogram (2.2 lb)[1]
Dimensions10-centimetre (3.9 in) cube
Start of mission
Launch date20 May 2010, 21:58:22 (2010-05-20UTC21:58:22Z) UTC
RocketH-IIA 202
Launch siteTanegashima Yoshinobu 1
End of mission
Decay date26 June 2010
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude286 kilometres (178 mi)
Apogee altitude305 kilometres (190 mi)
Inclination29.9 degrees
Period90.42 minutes
Epoch23 May 2010[2]

Negai☆″ ("Wish") is a Japanese satellite which launched in May 2010. It is a student-built spacecraft, which will be operated by Soka University, and is intended to be used for technology demonstration.[3] The satellite is a single unit CubeSat, and will be used to test a field programmable gate array in orbit.[4] As part of an outreach programme, it will carry the names of selected children, along with wishes they have made. The satellite will return images of the Earth, which will be given to the participating children.[5]

The launch was conducted by Mitsubishi Heavy Industries under contract to the Japan Aerospace Exploration Agency. In preparation for a planned launch on 17 May, the H-IIA rocket was rolled out to Pad 1 of the Yoshinobu Launch Complex at the Tanegashima Space Centre 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 and by 15:28, 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.

Negai was deployed from a JAXA Picosatellite Deployer attached to the second stage of the H-IIA 202 rocket used in the launch of the Akatsuki spacecraft towards Venus. Negai shared its dispenser with the K-Sat satellite, whilst a second dispenser contained Waseda-SAT2. The three CubeSats separated into low Earth orbit (LEO) during a coast phase of the launch, between the first and second burns of the second stage. The rocket then continued to Heliocentric orbit, where it deployed Akatsuki, along with the IKAROS and UNITEC-1 spacecraft.[7]

See also


  1. ^ "Negai". Soka University. Archived from the original on 8 March 2010. Retrieved 17 May 2010.
  2. ^ McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 25 December 2013.
  3. ^ Krebs, Gunter. "Negai*". Gunter's Space Page. Archived from the original on 27 April 2011. Retrieved 17 May 2010.
  4. ^ Nerlich, Steve. "A Multiple Payload" (PDF). Cheap Astronomy. Retrieved 17 May 2010.
  5. ^ "Japanese space agency selects Soka microsatellite for 2010 launch". Soka University. Archived from the original on 24 February 2012. Retrieved 17 May 2010.
  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.