C/2002 L9 NEAT
more info
C/2002 L9 was discovered on 13 June 2002 by the NEAT as an apparently asteroidal object. Later, its cometary apperance was reported [IAUC 7931, 2002 July 2]. Later, a few pre-discovery detections by LINEAR were found.
This comet made its closest approach to the Earth on 30 July 2003 (6.365 au), eight months before perihelion.
Solution given here is based on data spanning over 4.6 yr in a range of heliocentric distances: 8.23 au – 7.033 au (perihelion) – 9.48 au.
This Oort spike comet suffers slight planetary perturbations during its passage through the planetary system.
See also Królikowska 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 323
data interval 2002 06 06 – 2007 01 11
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 8.23 au – 7.03 au (perihelion) – 9.48 au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 634
RMS [arcseconds] 0.49
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 2004 04 25
perihelion date 2004 04 06.05249500 ± 0.00077100
perihelion distance [au] 7.03303845 ± 0.00000591
eccentricity 0.99850170 ± 0.00000615
argument of perihelion [°] 231.431509 ± 0.000050
ascending node [°] 110.457237 ± 0.000011
inclination [°] 68.44554 ± 0.000011
recip semi-major axis [10-6 au-1] 213.04 ± 0.87
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