C/2000 O1 Koehn
more info
C/2000 O1 was discovered on 26 May 2000 by B.W. Koehn in the course of the LONEOS as a cometary object [IAUC 7462, 2000 July 23]. Positional observations of this comet were next linked by Brian G. Marsden with pre-discovery measurements of two asteroidal objects observed by LINEAR (1998 XA70 = 1999 UJ10) going back to 14 December 1998 [MPEC 2000-O22].
This comet made its closest approach to the Earth on 9 November 1999 (5.050 au), 2.5 months before perihelion.
Solution given here is based on data spanning over 2.7 yr in a range of heliocentric distances: 6.58 au – 5.922 au (perihelion) – 7.15 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (see future barycentric orbit).
See also Królikowska 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 65
data interval 1998 12 14 – 2001 08 27
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 6.58 au – 5.92 au (perihelion) – 7.15 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 128
RMS [arcseconds] 0.81
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 1692 09 27
perihelion date 2000 01 28.21257900 ± 0.00334200
perihelion distance [au] 5.91487290 ± 0.00002655
eccentricity 0.99969254 ± 0.00002809
argument of perihelion [°] 55.184190 ± 0.000313
ascending node [°] 88.877691 ± 0.000115
inclination [°] 148.072564 ± 0.00004
reciprocal semi-major axis [10-6 au-1] 51.98 ± 4.75
file containing 5001 VCs swarm
2000o1a1.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.