C/2012 K8 Lemmon
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Comet C/2012 K8 was discovered on 30 May 2012 with Mount Lemmon survey, that is about 2.2 years before its perihelion passage. It was observed during five oppositions until 8 June 2016.

Comet had its closest approach to the Earth on 21 June 2014 (6.120 au), about 2 months before perihelion passage.

Solutions given here are based on data spanning over 4.02 yr in a range of heliocentric distances: 8.40 au – 6.463 au (perihelion) – 7.81 au.

This Oort spike comet suffers very tiny planetary perturbations during its passage through the planetary system and in the next perihelion passage it will be an Oort spike comet.

See also Królikowska and Dones 2023.

solution description
number of observations 987
data interval 2012 05 30 – 2016 06 08
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 8.4 au – 6.46 au (perihelion) – 7.81 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 1891
RMS [arcseconds] 0.43
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 2014 08 11
perihelion date 2014 08 19.35397307 ± 0.00050854
perihelion distance [au] 6.46300259 ± 0.00000305
eccentricity 1.00188074 ± 0.00000309
argument of perihelion [°] 75.851382 ± 0.000039
ascending node [°] 312.807423 ± 0.000008
inclination [°] 106.111837 ± 0.000006
reciprocal semi-major axis [10-6 au-1] -291.00 ± 0.48
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.
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).