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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