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IMS-1 (Indian Mini Satellite-1), previously referred to as TWSat (Third World Satellite), is a small earth observing satellite developed by ISRO.

Weighing 83 kg at lift-off, IMS-1 incorporates many new technologies and has miniaturised subsystems. IMS-1 carries two optical payloads – a Multispectral camera (Mx Payload) and a Hyperspectral camera (HySI Payload). Both Mx and HySI payloads operate in the visible and near infrared regions of the electromagnetic spectrum. The resolution of Mx camera is 37 meter with a swath of 151 km while that of HySI is about 506 meter with a swath of 129.5 km. The data from this mission will be made available to developing countries.

Nation: India
Type / Application: Earth observation
Operator: ISRO
Contractors: ISRO
Configuration: Microsatellite-SSB (SSB-2)
Propulsion: ?
Power: 2 deployable solar arrays, batteries
Lifetime: 2 years
Mass: 83 kg
Orbit: 630 km × 630 km, 97.9
Satellite COSPAR Date LS Launch Vehicle Remarks
IMS 1 2008-021D 28.04.2008 Sr SLP PSLV-CA with Cartosat 2A, CanX 6, CanX 2, AAUSAT 2, Cute 1.7 + APD II, COMPASS 1, Delfi C3, SEEDS 2, Rubin 8-AIS


Further IMS missions:

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