| Earth Observing-3 | |
| Operator: | NASA / Langley Research Center |
| Website: | nmp.jpl.nasa.gov/eo3 |
| Spacecraft Bus: | TRW T-310 |
| Manufacturer: | NOAA Office of Naval Research Space Dynamics Laboratory |
| Launch Mass: | 1805kg (3,979lb) |
| Power: | 320 watts |
| Instruments: | GIFTS-IOMI |
| Launch Date: | Cancelled Planned for 2005-06 |
| Launch Rocket: | Delta II |
| Launch Site: | Cape Canaveral SLC-17 |
Earth Observing 3 (EO3) was a proposed joint mission between NASA New Millennium Program and the US Navy's Office of Naval Research. Geosynchronous Imaging Fourier Transform Spectrometer — Indian Ocean METOC Imager (GIFTS-IOMI) was the instrument selected by NASA to perform as EO3's latest weather satellite observing instrument. The EO3 project ended with the cancellation of NMP in 2008.