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Comet Ikeya–Seki
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== Observing campaigns == Ikeya–Seki's perihelion presented a unique opportunity for astrophysical observations to be taken of a bright comet passing extremely close to the Sun.{{r|Roemer_1965|Roemer_1966a}} Additionally, the orientation of the comet's orbit with respect to Earth's was virtually ideal for observation of Ikeya–Seki.{{r|Hale_2020}} Several observatories{{snd}}including [[Kitt Peak National Observatory]], [[Lick Observatory]], and [[Haute-Provence Observatory]]{{snd}}performed [[spectrography|spectrographic observations]] of the comet near perihelion, documenting strong [[emission line]]s associated with ionized [[calcium]], [[iron]], [[sodium]], and other metals. [[Spectrogram]]s were also obtained by a rocket launched from the [[White Sands Missile Range]] to observe the comet in [[ultraviolet]].{{r|Roemer_1966b}} A pair of rocket launches from [[Wallops Island]] intended to provide similar data proved unsuccessful.{{r|Roemer_1966b}} Efforts at [[MIT]] and [[Harvard]] to detect [[radio emission]] from the comet yielded negative results. A [[Convair 990 Coronado|Convair 990]] operated by [[NASA]] out of [[Hawaii]] and a [[Boeing 707]] with scientists from [[Los Alamos National Laboratory]] were also involved in observational efforts targeting Ikeya–Seki. [[Gemini 6A]] was also planned to incorporate observation of the comet until the loss of the [[Agena target vehicle]] led to the cancellation of the original mission. [[Elizabeth Roemer]] remarked of the breadth of observational data in ''[[Publications of the Astronomical Society of the Pacific]]'' that "There seems no doubt that the appearance of Comet Ikeya–Seki will stand as a landmark in cometary physics."{{r|Roemer_1966b}}
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