The first sungrazing comet observed in the 20th century was in 1945 and then between 1960 and 1970 five sungrazing comets were seen (C/1961 O1, C/1962 C1, C/1963 R1, C/1965 S1, and C/1970 K1). The 1965 comet (Comet Ikeya-Seki) allowed for measurements of spectral emission lines and several elements were detected including Iron, marking this the first comet since the Great Comet of 1882 to show this feature. Other emission lines included K, Ca, Ca+, Cr, Co, Mn, Ni, Cu, and V. Comet Ikeya-Seki also led to separating the Kreutz sungrazers into two subgroups by Brian Marsden in 1967. One subgroup appears to have the 1106 comet as the parent body and members are fragments of that comet, while the other group have similar dynamics but no confirmed parent body associated with it.