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 (heliocentric ecliptic J2000)
Epoch 2000 01 17
perihelion date 2000 01 27.39323200 ± 0.00340200
perihelion distance [au] 5.92165320 ± 0.00002637
eccentricity 1.00069750 ± 0.00002806
argument of perihelion [°] 55.112765 ± 0.000318
ascending node [°] 88.862048 ± 0.000114
inclination [°] 148.097534 ± 0.000041
recip semi-major axis [10-6 au-1] -117.79 ± 4.74
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