WINDS (Kizuna)
H-IIA F14 launching KIZUNA.jpg
Launch of WINDS (Kizuna) on H-IIA Flight 14.
Mission typeCommunication
COSPAR ID2008-007A
SATCAT no.32500
Mission duration5 years (design)
Final: 11 years, 4 days
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)
Perigee altitude35,784.1 kilometres (22,235.2 mi)
Apogee altitude35,803.8 kilometres (22,247.4 mi)
Inclination0.2 °
Period1,436.1 minutes
Epoch00:00:00 UTC 2016-08-31[2]

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

Prior to launch, a JAXA brochure claimed that WINDS will be able to provide 155 Mbit/s download speeds to home users with 45-centimetre diameter satellite dishes, while providing industrial users via 5-metre diameter dishes with 1.2 Gbit/s speeds.[3]

WINDS had a launch mass of 4,850 kg, reducing to a mass of around 2,750 kg after thrusting to its operational 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 communications failure on 9 February 2019,[4] and it was decommissioned by the transmission of a deactivation command at 06:54 GMT on 27 February 2019.[5]

See also


  1. ^ Kallender-Umezu, Paul (24 November 2014). "Japan's NEC Looks To Expand Commercial Market Footprint". Retrieved 31 August 2016.
  2. ^ "WINDS (KIZUNA)". 31 August 2016. Archived from the original on 31 August 2016. Retrieved 31 August 2016.
  3. ^ "JAXA - 超高速インターネット衛星―WINDS" (PDF). JAXA. 26 December 2007. Archived from the original (PDF) on 28 February 2008. Retrieved 23 February 2008.
  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 links

  • JAXA website about WINDS
  • LIVE COVERAGE: H-IIA KIZUNA (WINDS) Launch (updated 1:20 GMT) 1:20 GMT (8:20 pm EST): T-6 hours. Fueling of the H-IIA has commenced