IGS-1

 2003-009A

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MELCO built the optical IGS. Mass of 850 kg. Operated by National Space Information Center.

Launch was by H2A 2024 with a 4/4D-LC adapter. IGS-R1 was in the upper position and IGS-O1 was in the lower position. The two satellites have a common box-shaped bus (possibly based on USERS) with two solar panels. IGS-O1's payload module has a box-shaped instrument section with two cameras.

Solar panel span around 16.5m.

Reportedly Optical-1 only achieved 2-3m instead of the planned 1m.

Name is Kougaku 1 gouki (Optical machine number 1).

IGS Optical-1
Date	Time	Event	Orbit
2003 Mar 28	0127	Launch by H2A 2024	TNSC
		T+1:40 SRB-A burnout
		T+1:47 SRB-A sep
		T+4:20 PLF sep
		T+6:35 St 1 MECO
		T+6:43 St 1 sep
		T+6:49? Stage 2 burn
	0142	T+15? SECO
	0143?	IGS-1a sep	94.37 484 x 491 x 97.31
	0145?	Upper fairing sep
	0145?	Fairing Side panels sep
	0150?	IGS-1b sep	94.36 483 x 491 x 97.31
2003 Apr 22			487 x 496 x 97.3
2014 Jul 18		Reentered

Payload:

• OPS-M optical sensors, 1-m res

2003-009B

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NASDA's IGS will be its first spy satellite. Two radar and two optical sats will be launched. Radar sat mass is 1200 kg. The satellites are built by MELCO. The Radar sat payload module carries a deployable radar antenna.

Solar panel span probably about 22.5m.

Times based on ADEOS, with separation times pure guesswork. The satellite failed after 4 years of its planned 5 year mission.

Name is Re-da 1 gouki (Radar-1).

IGS Radar-1
Date	Time	Event	Orbit
2003 Mar 28	0127	Launch by H2A 2024	TNSC
		T+1:40 SRB-A burnout
		T+1:47 SRB-A sep
		T+4:20 5S PLF sep
		T+6:35 St 1 MECO
		T+6:43 St 1 sep
		T+6:49? Stage 2 burn
	0142	T+15? SECO
	0143?	IGS-1a sep	94.37 484 x 491 x 97.31
	0145?	Upper fairing sep
	0145?	Fairing Side panels sep
	0150?	IGS-1b sep	94.36 483 x 491 x 97.31
2003 Apr 22			497 x 511 x 97.3
	1030?	lower peri	488 x 512 x 97.3
2007 Mar 25		Power supply failed
2012 Jul 26	0952	Entry over Pacific

Payload:

• SAR, 3-m res