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**IKONOS overview.** First **commercial sub-meter** Earth-observation satellite — a landmark. - **Operator / launch:** Space Imaging, **September 1999** (active to **March 2015**). - **Orbit:** sun-synchronous, **10:30 AM** equator crossing. - **Altitude:** **682 km**. - **Ground-track repeat:** **11 days**. - **Nadir swath / scene:** **11 km × 11 km**.

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