Comets C/2004 W7, 2004 W8, 2004 W9 (soho) Hoffman, T. ; Leprette, X. ; Gao, X. ; Battams, K. ; Marsden, B. G. Abstract Publication: Minor Planet Electronic Circulars Pub Date: January 2005 Bibcode: 2005MPEC....A...12H