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What is the most distant object from the earth that a spacecraft visited has visited so far? What was the mission and when did it happen?

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Depending on your definition of "object," Neptune is currently the farthest. It was visited by Voyager 2 in 1989. New Horizons will be visiting Pluto in 2015

If by object you mean cosmic structure though, then Voyager 1 is currently in the Heliosheath and is expected to reach the heliopause by 2015. These are regions that describe interactions between the sun's solar wind and the interstellar medium.

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  • $\begingroup$ Had Voyager 2 really visited Pluto? Or just crossed its orbit? $\endgroup$
    – Gamlor
    Jun 9, 2011 at 10:21
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    $\begingroup$ Just crossed it's orbit $\endgroup$
    – John Conde
    Jun 9, 2011 at 13:07
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We landed on Titan in 2004. That is definitely a milestone in being far away and landing on the surface of something big. Source

It's a damn shame they didn't manage to get a better photograph of the surface.

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    $\begingroup$ Welcome to Astronomy and thanks for your input! I think this answer has potential value, but whilst this may provide access to relevant information it would be preferable to include the essential parts of the answer here, and provide the link for reference. $\endgroup$
    – Grant Thomas
    Jul 15, 2011 at 17:53
  • $\begingroup$ +1 for "landed" as a fair interpretation of "visited"... $\endgroup$
    – Andrew Vit
    Sep 18, 2011 at 21:04

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