C/2007 D1 LINEAR
more info
C/2007 D1 was discovered on 17 February 2007 by the LINEAR as an apparently asteroidal object, however quickly its cometary appearance was reported.
This comet made its closest approaches to the Earth on 22 February (7.880 au, 4 months before perihelion passage, 5 days after its discovery) and 4 March 2008 (7.933 au, 8.5 months after perihelion).
Solution given here is based on data spanning over 6.2 yr in a range of heliocentric distances: 8.82 au – 8.794 au (perihelion) – 14.7 au.
This Oort spike comet suffers large planetary perturbations during its passage through the planetary system that lead to a notable more tight future orbit with the semimajor axis shorter than 2000 au (see future barycentric orbit).
See also Królikowska 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 548
data interval 2007 02 17 – 2013 05 04
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 8.82 au – 8.79 au (perihelion) – 14.7 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 1061
RMS [arcseconds] 0.45
orbit quality class 1a+
orbital elements (barycentric ecliptic J2000)
Epoch 1695 05 15
perihelion date 2007 06 19.62761600 ± 0.00269300
perihelion distance [au] 8.79200698 ± 0.00001358
eccentricity 0.99961354 ± 0.00000832
argument of perihelion [°] 340.120329 ± 0.000140
ascending node [°] 171.125352 ± 0.000008
inclination [°] 41.426988 ± 0.000014
reciprocal semi-major axis [10-6 au-1] 43.96 ± 0.95
file containing 5001 VCs swarm
2007d1a5.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.