C/2006 YC Catalina
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C/2006 YC was discovered almost simultaneously on 16 December 2006 by the Catalina Sky Survey as an apparently asteroidal object, and by Eric J. Christensen during the course of Mount Lemmon Survey who quickly reported its cometary appearance.
This comet made its closest approach to the Earth on 17 February 2007 (4.116 au), two months after its discovery and five months after perihelion passage.
Solution given here is based on data spanning over 0.3 yr in a narrow range of heliocentric distances from 5.00 au to 5.22 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a notable more tight future orbit (see future barycentric orbit).
See also Królikowska 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 147
data interval 2006 12 16 – 2007 04 15
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 5 au – 5.22au
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 286
RMS [arcseconds] 0.42
orbit quality class 2a
orbital elements (heliocentric ecliptic J2000)
Epoch 2006 09 22
perihelion date 2006 09 11.77695200 ± 0.03147500
perihelion distance [au] 4.94821307 ± 0.00013935
eccentricity 1.00023183 ± 0.00006089
argument of perihelion [°] 335.518236 ± 0.004348
ascending node [°] 154.288752 ± 0.000125
inclination [°] 69.558721 ± 0.001653
reciprocal semi-major axis [10-6 au-1] -46.85 ± 12.30
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.