Table 1: General characteristics of the observational material. The succesive columns signify: comet designation and name (Col. 1) perihelion time, T, and perihelion distance, q(2), observational arc and number of all observations (3), rms for the pure gravitational orbital fitting to pre-periherlion (4), post-perihelion (5) and all (6) observations, rms for the NG orbital fitting to all observations (7), original (8) and future (9) reciprocals of semimajor axes in units of 10-6 AU-1.
Comet Perihelion Observational rms $(1/a)_{\rm {ori}}$ $(1/a)_{\rm {fut}}$
name time T [Date] material Pure grav. case NG case NG
  q [AU] (Number of obs.) pre- post- all all (pure grav. )
      perih. perih.        
1996 B2 1996 05 01 19960101-19961102 1 $.\!\!^{\prime\prime}$02 1 $.\!\!^{\prime\prime}$19 1 $.\!\!^{\prime\prime}$66 1 $.\!\!^{\prime\prime}$08 1515 554
Hyakutake 0.230 (1026) (971) (55)     (1400) (540)
1959 Y1 1960 03 21 19600104-19600617 1 $.\!\!^{\prime\prime}$29 2 $.\!\!^{\prime\prime}$14 3 $.\!\!^{\prime\prime}$00 1 $.\!\!^{\prime\prime}$64 -202 -319
Burnham 0.504 (88) (34) (54)     (-139) (-582)
1969 Y1 1970 03 20 19691230-19701027 0 $.\!\!^{\prime\prime}$80 1 $.\!\!^{\prime\prime}$68 2 $.\!\!^{\prime\prime}$00 1 $.\!\!^{\prime\prime}$53 7381 7126
Bennett 0.538 (548) (159) (389)     (7317) (7126)
1999 H1 1999 07 11 19990416-20000108 0 $.\!\!^{\prime\prime}$71 0 $.\!\!^{\prime\prime}$69 0 $.\!\!^{\prime\prime}$98 0 $.\!\!^{\prime\prime}$69 1288 397
Lee 0.708 (1032) (352) (680)     (1313) (365)
1991 T2 1992 07 24 19911006-19920821 1 $.\!\!^{\prime\prime}$21 - 1 $.\!\!^{\prime\prime}$21 1 $.\!\!^{\prime\prime}$14 894 1019
Shoemaker-Levy 0.836 (212) (209) (3)     ( 941) ( 434)
1993 Y1 1994 03 31 19931217-19940908 0 $.\!\!^{\prime\prime}$82 1 $.\!\!^{\prime\prime}$12 1 $.\!\!^{\prime\prime}$23 1 $.\!\!^{\prime\prime}$00 7349 8442
McNaught-Russell 0.868 (397) (146) (251)     (7171) (8261)
1995 O1 1997 04 01 19930427-20011217 1 $.\!\!^{\prime\prime}$06 1 $.\!\!^{\prime\prime}$06 1 $.\!\!^{\prime\prime}$29 1 $.\!\!^{\prime\prime}$07 3841 5588
Hale-Bopp 0.918 (3550) (2580) (970)     (3797) (5566)
1990 K1 1990 10 25 19900521-19920401 1 $.\!\!^{\prime\prime}$18 1 $.\!\!^{\prime\prime}$22 1 $.\!\!^{\prime\prime}$94 1 $.\!\!^{\prime\prime}$21 26 -790
Levy 0.939 (678) (590) (88)     (112) (-849)
1999 J3 1999 09 20 19990512-20000228 0 $.\!\!^{\prime\prime}$66 1 $.\!\!^{\prime\prime}$12 1 $.\!\!^{\prime\prime}$25 0 $.\!\!^{\prime\prime}$83 1150 963
Linear 0.977 (196) (91) (105)     (1084) (769)
1995 Y1 1996 02 24 19951226-19960921 0 $.\!\!^{\prime\prime}$79 0 $.\!\!^{\prime\prime}$72 0 $.\!\!^{\prime\prime}$96 0 $.\!\!^{\prime\prime}$80 -67 649
Hyakutake 1.055 (262) (185) (77)     (-4) (1119)
1998 P1 1998 10 17 19980811-19990515 0 $.\!\!^{\prime\prime}$58 1 $.\!\!^{\prime\prime}$73 4 $.\!\!^{\prime\prime}$58 1 $.\!\!^{\prime\prime}$10   211 1320
Williams 1.147 (461) (133) (328)     (-125) (1119)
1999 T1 2000 12 13 19991007-20011202 0 $.\!\!^{\prime\prime}$82 0 $.\!\!^{\prime\prime}$45 1 $.\!\!^{\prime\prime}$27 0 $.\!\!^{\prime\prime}$76 1111 141
McNaught-Hartley 1.172 (481) (260) (442)     ( 1111) ( 34)
1986 P1A 1987 04 21 19860805-19890411 1 $.\!\!^{\prime\prime}$31 1 $.\!\!^{\prime\prime}$32 1 $.\!\!^{\prime\prime}$62 1 $.\!\!^{\prime\prime}$31 42 768
Wilson 1.200 (688) (507) (181)     (-0.4) (725)
1996 E1 1996 07 27 19960315-19961012 0 $.\!\!^{\prime\prime}$80 0 $.\!\!^{\prime\prime}$75 1 $.\!\!^{\prime\prime}$01 0 $.\!\!^{\prime\prime}$77 28 34
NEAT 1.359 (249) (177) (72)     (-43) (36)
1998 T1 1999 06 25 19981002-20000508 0 $.\!\!^{\prime\prime}$59 0 $.\!\!^{\prime\prime}$77 1 $.\!\!^{\prime\prime}$43 0 $.\!\!^{\prime\prime}$70 560 1481
Linear 1.468 (466) (263) (203)     (559) (1458)
1975 T1 1975 12 25 19751006-19761024 1 $.\!\!^{\prime\prime}$35 1 $.\!\!^{\prime\prime}$21 1 $.\!\!^{\prime\prime}$48 1 $.\!\!^{\prime\prime}$31 2052 1572
Mori-Sato-Fujikawa 1.604 (197) (139) (58)     (1958) (1540)
1987 W2 1988 03 03 19871121-19880812 0 $.\!\!^{\prime\prime}$93 1 $.\!\!^{\prime\prime}$56 1 $.\!\!^{\prime\prime}$18 1 $.\!\!^{\prime\prime}$06 401 50
Furuyama 1.680 (154) (144) (10)     (266) ( 7)
1993 A1 1994 01 13 19921126-19940817 1 $.\!\!^{\prime\prime}$33 0 $.\!\!^{\prime\prime}$66 2 $.\!\!^{\prime\prime}$79 1 $.\!\!^{\prime\prime}$14 58 -409
Mueller 1.938 (746) (671) (75)     (-19) (-539)
1991 B1 1991 12 31 19910113-19930815 0 $.\!\!^{\prime\prime}$96 0 $.\!\!^{\prime\prime}$92 1 $.\!\!^{\prime\prime}$06 0 $.\!\!^{\prime\prime}$93 3027 3100
Shoemaker-Levy 2.264 (429) (123) (306)     (3019) (3083)


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