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Visual observations Instr : 150mm / f15 Refractor ICQ Format Comet observations of : C/1991 Y1 Zanotta-Brewington IIIYYYYMnL YYYY MM DD.DD eM/mm.m:r AAA.ATF/xxxx /dd.ddnDC /t.ttmANG ICQ XX*OBSxx 1991Y1 1991 12 25.73 S 10.3 AA 15.0R15 85 2 0 ICQ XX DIE02 1991Y1 1992 01 10.74 S 8.6 AA 15.0R15 85 2.5 7 ICQ XX DIE02 1991Y1 1992 01 26.74 S 7.5 AA 15.0R15 85 2 7 ICQ XX DIE02