C/2002 R4 = C/2007 Y4 ( SOHO )

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Fragmentation Tree of Marsden Group Surviving Diminished C/1996 V2 = C/2002 V5 C/1997 B5 C/2002 R1 = C/2008 A3 C/2002 R4 = C/2007 Y4 C/1998 A2 C/2004 W10 C/1999 J6 = C/2004 V9 C/1999 N5 = C/2005 E4 C/1999 N5 = C/2005 G2 C/1999 P6 C/1999 U2 = C/2005 W5 C/2000 C4 = C/2005 W1 C/2006 E2 Returns and Appearances Discovered Appeared Not observed Appeared before discovery Not observed before discovery Returns in the future 2013 Apr. 13 C/2007 Y4 2007 Dec. 22 C/2002 R4 2002 Sept. 3 1997 May 12

The identification between C/2002 R4 and C/2007 Y4 is printed on M.P.E.C. 2008-B49. The perihelion date in 1997 is printed on M.P.E.C. 2008-B49.