C/2001 B2 NEAT
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Comet C/2001 B2 was discovered on 24 January 2001, almost five months after perihelion passage, and next observed 3.1 yr during its four oppositions in a range of heliocentric distances: 5.42 au – 5.306 au (perihelion) – 10.23 au.
Comet had its closest approaches to the Earth on 26 April 2000 (4.526 au, more than 4 months before perihelion passage) and on 11 March 2001 (4.550 au, less than two months after discovery).
This 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 and Dybczyński 2017.

solution description
number of observations 587
data interval 2001 01 24 – 2004 02 21
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 5.42 au – 8.11au
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 1153
RMS [arcseconds] 0.59
orbit quality class 1a
orbital elements (heliocentric ecliptic J2000)
Epoch 2000 09 12
perihelion date 2000 09 01.87798652 ± 0.00117164
perihelion distance [au] 5.30643309 ± 0.00000768
eccentricity 1.00294235 ± 0.00000579
argument of perihelion [°] 304.751371 ± 0.000140
ascending node [°] 145.084646 ± 0.000014
inclination [°] 150.608868 ± 0.000016
recip semi-major axis [10-6 au-1] -554.49 ± 1.09
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