|Launch mass||72 kg (159 lb)|
|Dimensions||72 cm × 62 cm × 62 cm|
|Start of mission|
|Launch date||24 August 2005|
|Launch site||Baikonur Pad 109/95|
|Semi-major axis||6,975.4 km (4,334.3 mi)|
|Mean motion||14.9020938 rev/day|
|Epoch||May 3, 2018, 22:37:00.128 UTC|
|25 μm-thick polyimide mirrors|
Reimei ('Dawn') is the in-flight name for a small Japanese satellite known during development as INDEX (INnovative-technology Demonstration Experiment), developed in-house at JAXA both to serve as a demonstration of small-satellite technologies (particularly high-performance and high-accuracy attitude control) and to perform simultaneous optical and charged-particle observation of the aurora. A notable feature is the 25 μm-thick polyimide mirrors used for concentrating sunlight onto the solar arrays.
It is 72 cm × 62 cm × 62 cm and weighs 72 kilograms. The construction budget was $4 million. The satellite was launched into a near-sun-synchronous 630 km orbit on 24 August 2005 as a piggyback on the OICETS launch on the Dnepr launch vehicle.