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Table 2

Orbital characteristics of the 12 comets and their classification.

Comet T p e a q i P T J Type (L)

C/2002 V1 (NEAT) 18-02-2003 0.99990 1010 0.10 82 32 100 0.06 EXT
C/2002 X5 (Kudo-Fujikawa) 29-01-2003 0.99984 1175 0.19 94 40 300 –0.03 EXT
C/2002 Y1 (Juels-Holvorcem) 13-04-2003 0.99715 250.6 0.71 104 3967 –0.23 EXT
C/2001 Q4 (NEAT) 16-05-2004 1.00069 0.96 100 NEW
C/2002 T7 (LINEAR) 23-04-2004 1.00048 0.61 161 NEW
C/2003 K4 (LINEAR) 14-10-2004 1.00030 1.02 134 NEW
9P/Tempel 1 05-07-2005 0.51749 3.1 1.51 11 5.5 2.97 JF
73P-C/Schwassmann-Wachmann 3 07-06-2006 0.69338 3.1 0.94 11 5.4 2.78 JF
73P-B/Schwassmann-Wachmann 3 08-06-2006 0.69350 3.1 0.94 11 5.4 2.78 JF
8P/Tuttle 27-01-2008 0.81980 5.7 1.03 55 13.6 1.60 HF
103P/Hartley 2 28-10-2010 0.69500 3.5 1.06 14 6.5 2.64 JF
C/2009 P1 (Garradd) 23-12-2011 1.00110 1.55 106 NEW

Notes.Tp is the epoch of the perihelion (dd-mm-yyyy), e the eccentricity, a is related to the semi-major axis of the orbit (AU), q is the perihelion distance (AU), i represents the inclination on the ecliptic (degrees), P is the period (years), TJ is the Tisserand parameter relative to Jupiter. The last data correspond to the classification of the comets according to Levison (1996): HF and JF mean “Halley family” and “Jupiter family”, and they gather comets with short periods (<200 years); EXT and NEW are respectively for external comets (a < 10   000 AU) and new comets (a > 10   000 AU), which came from the Oort cloud.

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