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WINDS (Wideband InterNetworking engineering test and Demonstration Satellite, also known as Kizuna), is a Japanese communication satellite. Launch was originally scheduled for 2007. The launch date was eventually set for 15 February 2008, however a problem detected in a second stage manoeuvring thruster delayed it to 23 February. Lift-off occurred at 08:55 GMT on 23 February, and the satellite separated from the carrier rocket, into a Geosynchronous transfer orbit at 09:23, launched by an H-IIA carrier rocket from the Tanegashima Space Center. It will be used to relay the internet to Japanese homes and businesses, through Ka-Band signals. It will also develop technologies to be utilised by future Japanese communication spacecraft. It is part of Japan's i-Space program, and is to be operated by JAXA and NICT.

WINDS (Kizuna)
Mission typeCommunication
COSPAR ID2008-007A
SATCAT no.32500
Mission duration5 years (design)
Spacecraft properties
Launch mass4,850 kilograms (10,690 lb)
BOL mass2,750 kilograms (6,060 lb)
Start of mission
Launch date23 February 2008, 08:55 (2008-02-23UTC08:55Z) UTC
Launch siteTanegashima Y1
End of mission
Deactivated27 February 2019, 06:54 (2019-02-27UTC06:55Z) UTC
Orbital parameters
Reference systemGeocentric
Longitude143° East
Semi-major axis42,164 kilometres (26,199 mi)
Perigee35,784.1 kilometres (22,235.2 mi)
Apogee35,803.8 kilometres (22,247.4 mi)
Inclination0.2 °
Period1,436.1 minutes
Epoch00:00:00 UTC 2016-08-31[2]

JAXA claim that WINDS will be able to provide 155 Mbit/s download speed to home users with 45-centimetre diameter satellite dishes, whilst providing industrial users, via 5-metre diameter dishes, with 1.2 Gbit/s speeds.[3]

WINDS has a launch mass of 4,850 kg, reducing to around 2,750 kg when in orbit. The spacecraft is 8 m x 3 m x 2 m in size, and its solar panels have a span of 21.5 metres. It has three-axis stabilisation, and a design life expectancy of five years.

The satellite became inoperable due to the communication failure on 9 February 2019,[4] and it was decommissioned by the transmission of deactivation command at 06:54, 27 February 2019.[5]

See alsoEdit


  1. ^ Kallender-Umezu, Paul (November 24, 2014). "Japan's NEC Looks To Expand Commercial Market Footprint". Retrieved 2016-08-31.
  2. ^ "WINDS (KIZUNA)". August 31, 2016. Archived from the original on 2016-08-31. Retrieved 2016-08-31.
  3. ^ "JAXA - 超高速インターネット衛星―WINDS" (PDF). JAXA. 2007-12-26. Archived from the original (PDF) on 2008-02-28. Retrieved 2008-02-23.
  4. ^ 「きずな」(WINDS)の運用状況について (in Japanese). JAXA. 13 February 2019. Retrieved 6 March 2019.
  5. ^ 超高速インターネット衛星「きずな」(WINDS)の運用終了について (in Japanese). JAXA. 1 March 2019. Retrieved 6 March 2019.

External linksEdit