C/2007 Y1 LINEAR
more info
C/2007 Y1 was discovered on 16 December 2007 by the LINEAR as an apparently asteroidal object. Next, its cometary apperance was reported by several observers [IAUC 8904, 2007 December 18].
This comet made its closest approaches to the Earth on 10 February 2008 (2.402 au), 1.3 month before perihelion (see figure).
Solution given here is based on data spanning over 0.38 yr in a narrow range of heliocentric distances: 3.46 au – 3.341 au (perihelion) – 3.37 au.
This Oort spike comet suffers rather 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 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 209
data interval 2007 12 16 – 2008 05 03
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 3.46 au – 3.34 au (perihelion) – 3.37 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 415
RMS [arcseconds] 0.61
orbit quality class 2a
orbital elements (heliocentric ecliptic J2000)
Epoch 2008 04 04
perihelion date 2008 03 19.33455400 ± 0.00228200
perihelion distance [au] 3.34090683 ± 0.00001666
eccentricity 1.00074172 ± 0.00004139
argument of perihelion [°] 357.128047 ± 0.000534
ascending node [°] 133.091508 ± 0.000091
inclination [°] 110.179814 ± 0.000359
recip semi-major axis [10-6 au-1] -222.01 ± 12.39
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