C/2000 W1 Utsunomiya-Jones
more info
Comet C/2000 W1 was discovered on 18 November 2000 by Syogo Utsunomiya (Aso, Kumamoto, Japan), Albert F. Jones (Nelson, New Zealand); that is a bit more than one month before its perihelion passage. It was observed until 23 January 2001.
Comet had its closest approach to the Earth on 25 November 2000 (0.280 au), one week after its discovery.
Solutions given here are based on data spanning over 0.159 yr in a range of heliocentric distances: 0.858 au – 0.321 au (perihelion) – 0.820 au..
This comet (original semimajor axis of about 8,000 au) suffers large planetary perturbations during its passage through the planetary system; these perturbations lead to a significantly more tight future orbit with semimajor axis of about 600 au.
See also Królikowska 2020

solution description
number of observations 190
data interval 2000 11 26 – 2001 01 23
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 0.85 au – 0.32 au (perihelion) – 0.82 au
detectability of NG effects in the comet's motion comet with determinable NG~orbit
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 371
RMS [arcseconds] 0.92
orbit quality class 2a
orbital elements (heliocentric ecliptic J2000)
Epoch 2000 12 02
perihelion date 2000 12 26.55909814 ± 0.00005301
perihelion distance [au] 0.32118091 ± 0.00000082
eccentricity 1.00001044 ± 0.00000333
argument of perihelion [°] 51.507488 ± 0.000494
ascending node [°] 10.764824 ± 0.000373
inclination [°] 160.165905 ± 0.000149
recip semi-major axis [10-6 au-1] -32.51 ± 10.36
Upper panel: 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.
Lower panel (panels): O-C diagram for this(two) solution (solutions) given in this database, where residuals in right ascension are shown using magenta dots and in declination by blue open circles.