C/2007 W3 LINEAR
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Comet C/2007 W3 was discovered on 29 November 2007 with Lincoln Laboratory Near-Earth Asteroid Research project; that is about 6 months before its perihelion passage. It was observed until 8 September 2008.
Comet had its closest approach to the Earth on 27 June 2008 (1.576 au), about 3.5 weeks after its perihelion passage.
Solutions given here are based on data spanning over 0.775 yr in a range of heliocentric distances: 2.89 au – 1.777 au (perihelion) – 2.17 au, and the non-gravitational acceleration is well-detectable in its motion during the period covered by positional observations (about nine months).
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system and these perturbations lead to a more tight future orbit (see future barycentric orbit).
See also Królikowska and Dybczyński 2013 and Królikowska 2020.

solution description
number of observations 208
data interval 2007 11 29 – 2008 09 08
data type significantly more measurements before perihelion (PRE+)
data arc selection entire data set (STD)
range of heliocentric distances 2.89 au – 1.78 au (perihelion) – 2.17 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 411
RMS [arcseconds] 0.54
orbit quality class 1b
orbital elements (barycentric ecliptic J2000)
Epoch 1708 09 24
perihelion date 2008 06 02.92271294 ± 0.00016701
perihelion distance [au] 1.77621996 ± 0.00000164
eccentricity 0.99997472 ± 0.00000360
argument of perihelion [°] 112.655476 ± 0.000087
ascending node [°] 73.055804 ± 0.000022
inclination [°] 78.636465 ± 0.000027
reciprocal semi-major axis [10-6 au-1] 14.23 ± 2.02
file containing 5001 VCs swarm
2007w3a5.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.