C/2002 O7 LINEAR
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Comet C/2002 O7 was discovered on 29 July 2002 with the Lincoln Laboratory Near-Earth Asteroid Research project, that is about a year and two months before its expected perihelion passage. Mattiazzo (2003) reported that C/2002 O7 was disrupted five days after perihelion, and a month later, the comet could no longer be found.
Comet had its closest approach to the Earth on 20 May 2003 (1.709 au), about 4 months before its perihelion passage.
Preffered solution given here is based on pre-perihelion data taken in perihelion distances larger than 2.44 au, that is spanning over 0.753 yr until 30 April 2003. Two NG solutions based on this shorter data-arc match the data equally, and both can be chosen as preferred solutions (dedicated to water ice ('pn') and CO ('p1') sublimation, respectively). Both these NG solutions give very different original 1/a.
See also Sekanina 2019 and Królikowska 2020.

solution description
number of observations 1641
data interval 2002 07 29 – 2003 07 07
data type observed only before perihelion (PRE)
data arc selection entire data set (STD)
range of heliocentric distances 5.42 au – 1.58au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 3247
RMS [arcseconds] 0.62
orbit quality class 2a
orbital elements (barycentric ecliptic J2000)
Epoch 1705 05 03
perihelion date 2003 09 21.74072185 ± 0.00017913
perihelion distance [au] 0.89909374 ± 0.00000156
eccentricity 0.99996942 ± 0.00000228
argument of perihelion [°] 252.223153 ± 0.000136
ascending node [°] 12.912849 ± 0.000041
inclination [°] 98.745892 ± 0.000049
reciprocal semi-major axis [10-6 au-1] 34.02 ± 2.54
file containing 5001 VCs swarm
2002o7n5.bmi
Time distribution of positional observations with corresponding heliocentric (red curve) and geocentric (green curve) distance at which they were taken. The horizontal dotted line shows the perihelion distance for a given comet whereas vertical dotted line — the moment of perihelion passage.
Six 2D-projections of the 6D space of original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.