C/2009 F4 McNaught
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Comet C/2009 F4 was discovered on 19 March 2009 by Robert H. McNaught, that is 2.8 yr before perihelion passage, and next was observed 6.4 yr during seven oppositions in a range of heliocentric distances: 8.96 au – 5.455 au (perihelion) – 10.5 au.
Comet had its closest approach to the Earth on 3 June 2011 (5.179 au, almost seven months before perihelion).
This Oort spike comet suffers a tiny planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (see future barycentric orbit).
See also Królikowska and Dybczyński 2017.

solution description
number of observations 1204
data interval 2009 03 19 – 2015 08 20
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 8.96 au – 5.46 au (perihelion) – 10.5 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 1684
RMS [arcseconds] 0.42
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 2011 12 25
perihelion date 2011 12 31.89245025 ± 0.00020708
perihelion distance [au] 5.45486596 ± 0.00000076
eccentricity 1.00159284 ± 0.00000143
argument of perihelion [°] 260.383469 ± 0.000015
ascending node [°] 53.584371 ± 0.000004
inclination [°] 79.347586 ± 0.000007
recip semi-major axis [10-6 au-1] -292.00 ± 0.26
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