C/2012 K1 PANSTARRS
more info
Comet C/2012 K1 was discovered on 19 May 2012 with Pan-STARRS 1 telescope (Haleakala), that is more than 2 years before its perihelion passage. Later a few pre-discovery images were found taken on 14 May ( MASTER-II Observatory, Tunka) and 17 May (Pan-STARRS 1). It was almost systematically observed until 7 August 2016 (see picture).
C/2012 K1 had its closest approach to the Earth on 31 October 2014 (0.953 au), about 2 months after its perihelion passage.
Preferred solution given here is based on data spanning over 4.23 yr in a range of heliocentric distances: 8.83 au – 1.055 au (perihelion) – 7.85 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that cause a bit tighter future orbit (see future barycentric orbits).
See also Królikowska 2020.

solution description
number of observations 7871
data interval 2012 05 14 – 2016 08 07
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 8.83 au – 1.05 au (perihelion) – 7.85 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 15569
RMS [arcseconds] 0.34
orbit quality class 1a+
orbital elements (barycentric ecliptic J2000)
Epoch 1715 12 17
perihelion date 2014 08 27.45052590 ± 0.00001329
perihelion distance [au] 1.05118145 ± 0.00000024
eccentricity 0.99995605 ± 0.00000025
argument of perihelion [°] 203.147084 ± 0.000017
ascending node [°] 317.658288 ± 0.000005
inclination [°] 142.417004 ± 0.000001
recip semi-major axis [10-6 au-1] 41.81 ± 0.23
file containing 5001 VCs swarm
2012k1n5.bmi
Upper panel: 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.
Lower panel (panels): O-C diagram for this(two) solution (solutions) given in this database, where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
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.