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[[Image:Comet Temple 1 detail.jpg|thumb|left|200px|Detail of crater-like features on Comet Tempel 1 in image taken by Deep Impact's impactor]]
==Re-discovery==
Tempel 1 was re-discovered 13 orbits later<!--- Sep. 1885, Mar. 1892, 1898, 1905, 1911, 1918, 1924, 1931, Dec. 1937, May 1944, Mar. 1950, Dec. 1955, 1961 --->, in the [[1960s]] (as 9P/1967 L1, 1966 VII) after American astronomer [[Brian G. Marsden]] performed precise calculations of the comet's orbit, taking into account Jupiter's [[perturbation (astronomy)|perturbation]]s. Marsden found that further close approaches to Jupiter in [[1941]] (0.41 AU) and [[1953]] (0.77 AU) had decreased both the perihelion distance and the orbital period to values smaller than when the comet was initially discovered (5.84 and 5.55 years, respectively). These approaches moved Tempel 1 into its present [[libration]] around the 1:2 resonance with Jupiter. Despite an unfavorable [[1967]] return, [[Elizabeth Roemer]] of the [[Catalina Observatory]] took several photographs. Initial inspection revealed nothing, but in late [[1968]] she found a [[June 8]], [[1967]] exposure (Tempel 1 had passed perihelion in January) that held the image of an 18th magnitude diffuse object very close to where Marsden had predicted the comet to be. Unfortunately, a single image does not allow an orbit computation, so the next return had to be awaited.
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