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 (heliocentric ecliptic J2000)
Epoch 2007 06 29
perihelion date 2007 06 19.46086500 ± 0.00272900
perihelion distance [au] 8.79372556 ± 0.00001369
eccentricity 1.00191986 ± 0.00000846
argument of perihelion [°] 340.159247 ± 0.000141
ascending node [°] 171.098537 ± 0.000008
inclination [°] 41.450252 ± 0.000013
recip semi-major axis [10-6 au-1] -218.32 ± 0.96
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