Table 1: Initial parameters of QHCs 82P/Gehrels 3, 111P/Helin-Roman-Crockett, and P/1996 R2 Lagerkvist (equinox J2000).
Object 82P 111P 1996 R2
Osculation epoch (TT) 2002 Mar. 27.0 2004 Dec. 21.0 1996 Oct. 08.0
Mean anomaly M $24\hbox{$.\!\!^\circ$ }27332$ $359\hbox{$.\!\!^\circ$ }25243$ $346\hbox{$.\!\!^\circ$ }17074$
Semimajor axis a (AU) 4.1388678 4.0400597 3.7820178
Eccentricity e 0.1238743 0.1402634 0.3099920
Argument of perihelion $\omega$ $227\hbox{$.\!\!^\circ$ }65115$ $10\hbox{$.\!\!^\circ$ }56557$ $334\hbox{$.\!\!^\circ$ }04513$
Longitude of ascending node $\mathit{\Omega}$ $239\hbox{$.\!\!^\circ$ }62851$ $91\hbox{$.\!\!^\circ$ }93769$ $40\hbox{$.\!\!^\circ$ }24084$
Inclination i $1\hbox{$.\!\!^\circ$ }12654$ $4\hbox{$.\!\!^\circ$ }23300$ $2\hbox{$.\!\!^\circ$ }60532$
Number of astrometric positions 103 126 135
Astrometric arc 1975 Oct. 27-2002 Mar. 08 1989 Jan. 03-2001 Sep. 20 1996 Aug. 12-1997 Jan. 12
  9629 days (26.36 yr) 4643 days (12.71 yr) 153 days (0.42 yr)
RMS residual $0\hbox{$.\!\!^{\prime\prime}$ }79$ $0\hbox{$.\!\!^{\prime\prime}$ }86$ $0\hbox{$.\!\!^{\prime\prime}$ }76$
Source reference JPL 12 Nakano (2005) JPL 18

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