IGS

Satellites details:

• IGS satellites were placed in 490 km sun-synchronous orbits.
• Optical-1 and Radar-1 were launched in Mar 2003; two satellites lost in a Nov 2003 launch failure would have been Optical-2 and Radar-2 on reaching orbit.
• In an effort to recover quickly, a second Optical-2 was launched on its own in Sep 2006 while the new Radar-2 was still being completed. The Optical-3 Verification Satellite is an experimental second-generation optical imaging craft that hitched a ride with Radar-2
• The IGS series is operated by Japan′s Cabinet Satellite Intelligence Center (Naikaku Eisei Joho Senta) and includes both optical and radar satellites.
• IGS satellites list:

                        Launch         Orbit (km x km x deg)  
    IGS Optical-1       2003 Mar 28    Reentered 2014 Jul         SSO 1020LT
    IGS Optical-2       2003 Nov 29    Failed to orbit            SSO 1330LT
    IGS Optical-2       2006 Sep 11    Reentered 2016 Oct         SSO 1330LT
    IGS Optical-3 Test  2007 Feb 24    Reentered 2013 Nov         SSO 1330LT
    IGS Optical-3       2009 Nov 28    584 x 590 x 97.7           SSO 1030LT 
    IGS Optical-4       2011 Sep 23    587 x 588 x 97.7           SSO 1315LT
    IGS Optical Demo    2013 Jan 27    425 x 429 x 97.2           SSO 1330LT
    IGS Optical-5       2015 Mar 26    510 x 516 x 97.5           SSO 1030LT
    IGS Optical-6       2018 Feb 27    485 x 499 x 97.2           SSO 2345LT
  
    IGS Radar-1         2003 Mar 28    Reentered 2012 Jul         SSO 1020LT
    IGS Radar-2         2003 Nov 29    Failed to orbit            SSO 1330LT
    IGS Radar-2         2007 Feb 24    Reentered 2014 Apr         SSO 1330LT
    IGS Radar-3         2011 Dec 12    510 x 515 x 97.5           SSO 1030LT    
    IGS Radar-4         2013 Jan 27    511 x 515 x 97.5           SSO 1330LT
    IGS Radar Spare     2015 Feb  1    481 x 484 x 97,4           SSO 1015LT
    IGS Radar-5         2017 Mar 17    486 x 489 x 97.4           SSO 1015LT
    IGS Radar-6         2018 Jun 12    500 x 502 x 97.4           SSO 1315LT