C/2011 L6 Boattini
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Comet C/2011 L6 was discovered ny Andrea Boattini (Mt Lemmon) on 8 June 2011, that is about 4.5 months after perihelion passage. Soon, the comet was found on earlier images taken on 28 May 2011 with the Mount Lemmon Survey.
Comet had its closest approach to the Earth on 14 May 2011 (5.819 au), about three weeks before discovery.
C/2011 L6 was observed 0.91 yr in a range of heliocentric distances from 6.84 au to 7.42 au.
This comet suffers very small planetary perturbations during its passage through the planetary system that lead to a less tight future orbit with semimjor axis larger than 10000 au. (see future barycentric orbit).
See also Królikowska and Dybczyński 2017.

solution description
number of observations 56
data interval 2011 05 28 – 2012 04 24
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 6.84 au – 7.42au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting NO
number of residuals 112
RMS [arcseconds] 0.59
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 2011 02 08
perihelion date 2011 01 22.92267436 ± 0.04600089
perihelion distance [au] 6.78778738 ± 0.00012531
eccentricity 1.00302592 ± 0.00006883
argument of perihelion [°] 331.611992 ± 0.003903
ascending node [°] 214.483687 ± 0.000242
inclination [°] 171.455846 ± 0.000132
reciprocal semi-major axis [10-6 au-1] -445.79 ± 10.13
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.