Reimei

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.

Reimei

Operator	JAXA
COSPAR ID	2005-031B
SATCAT no.	28810
Spacecraft properties
Launch mass	72 kg (159 lb)
Dimensions	72 cm × 62 cm × 62 cm
Start of mission
Launch date	24 August 2005 (2005-08-24)
Rocket	Dnepr
Launch site	Baikonur Pad 109/95[1]
Contractor	ISC Kosmotras
Orbital parameters
Reference system	Geocentric
Regime	Low Earth orbit
Semi-major axis	6,975.4 km (4,334.3 mi)
Eccentricity	0.0027340
Periapsis altitude	578.19003
Apoapsis altitude	616.33149
Inclination	98.1777
Period	96.63 min
Mean motion	14.9020938 rev/day
Epoch	May 3, 2018, 22:37:00.128 UTC[2]
Instruments
25 μm-thick polyimide mirrors

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.^[3][4]