C/2011 L2 McNaught
more info
Comet C/2011 L2 was discovered on 2 June 2011 by Robert H. McNaught (Siding Spring); that is about 5 months before its perihelion passage. The comet was observed until 28 January 2012.
Comet had its closest approach to the Earth on 27 July 2011 (1.500 au), almost 2 months after discovery and about 3 months before its perihelion passage.
Solutions given here are based on data spanning over 0.657 yr in a range of heliocentric distances: 2.66 au – 1.943 au (perihelion) – 2.22 au. The non-gravitational solution was chosen as preferred orbit; however, uncertainties of NG parameters are large.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system; these perturbations lead to a more tight future orbit (see future barycentric orbits).
See also Królikowska 2020.

solution description
number of observations 59
data interval 2011 06 02 – 2012 01 28
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 2.66 au – 1.94 au (perihelion) – 2.22 au
detectability of NG effects in the comet's motion comet with determinable NG~orbit
type of model of motion GR - gravitational orbit
data weighting NO
number of residuals 107
RMS [arcseconds] 0.41
orbit quality class 1b
orbital elements (barycentric ecliptic J2000)
Epoch 2313 08 11
perihelion date 2011 11 01.44422816 ± 0.00091185
perihelion distance [au] 1.94003669 ± 0.00000648
eccentricity 0.99966461 ± 0.00000983
argument of perihelion [°] 256.915316 ± 0.000379
ascending node [°] 131.392186 ± 0.000027
inclination [°] 104.367858 ± 0.000034
reciprocal semi-major axis [10-6 au-1] 172.88 ± 5.07
file containing 5001 VCs swarm
2011l2a1.bpl
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.
Six 2D-projections of the 6D space of future swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.