C/2012 A1 PANSTARRS
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Comet C/2012 A1 was discovered on 2 January 2012, that is 1.9 yr before perihelion passage, and next observed 3.2 yr during four oppositions in a range of heliocentric distances: 8.73 au – 7.603 au (perihelion) – 8.12 au.
Comet had its closest approach to the Earth on 22 December 2013 (6.642 au, about three weeks after perihelion passage, see figure).
C/2012 A1 suffers a slight planetary perturbations during its passage through the planetary system.
See also Królikowska and Dybczyński 2017.

solution description
number of observations 330
data interval 2012 01 02 – 2015 03 09
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 8.73 au – 7.60 au (perihelion) – 8.12 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 653
RMS [arcseconds] 0.40
orbit quality class 1a+
orbital elements (barycentric ecliptic J2000)
Epoch 1703 05 14
perihelion date 2013 11 30.41330050 ± 0.00116252
perihelion distance [au] 7.59939009 ± 0.00000784
eccentricity 0.99937163 ± 0.00000724
argument of perihelion [°] 191.830837 ± 0.000071
ascending node [°] 277.961310 ± 0.000007
inclination [°] 120.933007 ± 0.000014
reciprocal semi-major axis [10-6 au-1] 82.69 ± 0.95
file containing 5001 VCs swarm
2012a1a5.bmi
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 original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.