aqui teneis la lista de cometas visibles , con sus magnitudes visuales , si quereis efemerides , no teneis mas que pedirlas...
C/2001 Q4 (NEAT) is ~13.0 (last observation update 2/15) - Significant spread in estimates
C/2002 T7 (LINEAR) is [14.0 (2/14)
C/2003 K4 (LINEAR) is ~9.4 (3/4)
C/2003 T4 (LINEAR) is ~8.2 (3/4)
C/2004 Q1 (Tucker) is ~12.5 (3/4)
C/2004 Q2 (Machholz) is ~6.0 (3/4)
C/2004 U1 (LINEAR) is ~13.4 (1/14)
C/2004 V13 (SWAN) is ~11 (1/20)
C/2005 A1 (LINEAR) is ~9.0 (3/4)

9P/Tempel 1 m1~13.0 (3/4)
29P/Schwassmann-Wachmann 1 m1~12.5 (2/15)
32P/Comas-Sola m1~12.8 (3/8)
49P Arend-Rigaux m1~13.5 (2/15)
62P/Tsuchinshan 1 m1~13.0 (3/4)
78P/Gehrels is ~12.4 (2/15)