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Caption: The orbits of two Jupiter-family comets: 9P/Tempel 1 (green ellipse) and 103P/Hartley 2 (red ellipse). Tempel 1 was the target of the Deep Impact mission and is the target for the extended mission for Stardust-NExT. Hartley 2 is the target of DIXI, the extended Deep Impact mission, and is half of the EPOXI mission.
Also shown are the orbits of Earth and Jupiter (blue circles).
Credit: NASA/JPL-Caltech/UMD/GSFC/Tony Farnham