C/1999 K5 LINEAR
more info
C/1999 K5 was discovered as an apparently asteroidal object by LINEAR team on 20 May 1999 (1.1 yr before perihelion passage), and soon reported as cometary by several observers. Later pre-discovery detection from 15 May 1999 by 2MASS was found.
This comet made its closest approach to the Earth on 18 June 2000 (2.885 au), 16 days before perihelion.
Solution given here is based on data spanning over 2.8 yr in a range of heliocentric distances: 5.00 au – 3.255 au (perihelion) – 6.36 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to notable more tight future orbit (see future barycentric orbit).
See also Królikowska 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 250
data interval 1999 05 15 – 2002 03 18
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 5 au – 3.25 au (perihelion) – 6.36 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 492
RMS [arcseconds] 0.51
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 2000 06 25
perihelion date 2000 07 04.39254000 ± 0.00032200
perihelion distance [au] 3.25538203 ± 0.00000088
eccentricity 1.00167918 ± 0.00000306
argument of perihelion [°] 241.487043 ± 0.000043
ascending node [°] 106.381812 ± 0.000011
inclination [°] 89.473112 ± 0.000024
recip semi-major axis [10-6 au-1] -515.82 ± 0.94
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