Editing Comet Ikeya–Seki (section)

== Structure and composition ==
[[File:Ikeyaseki nucleus 6Nov1965.jpg|thumb|A 6-minute exposure of Ikeya–Seki's nucleus on 6 November 1965, faintly resolving the two primary components of the comet's fractured nucleus]]
Observations obtained by the [[McMath–Pierce solar telescope]] at [[Kitt Peak National Observatory]] detected [[emission line]]s associated with ionized [[calcium]], [[chromium]], [[cobalt]], [[copper]], [[iron]], [[manganese]], [[nickel]], [[sodium]], [[vanadium]], and [[cyanide]] in Ikeya–Seki's coma. The properties of the ionized iron and nickel lines suggested Ikeya–Seki reached an effective temperature of around 4800&nbsp;[[Kelvin (unit)|K]] around perihelion.{{r|Slaughter_1969}}