C/2018 C2 Lemmon
more info
Comet C/2018 C2 was discovered on 5 February 2018, about four months before its perihelion passage; later a few prediscovery measurements going back to 28 January 2018 were found. This comet was last seen on 27 October 2018.

Solutions (GR and NG) given here are based on data span over 0.748 yr in the range of heliocentric distances: 2.47 au – 1.96 au (perihelion) – 2.63 au.

This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (see future barycentric orbit).
solution description
number of observations 1677
data interval 2018 01 28 – 2018 10 27
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 2.47 au – 1.96 au (perihelion) – 2.63 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 3273
RMS [arcseconds] 0.17
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 1718 02 24
perihelion date 2018 06 02.76063181 ± 0.00011421
perihelion distance [au] 1.95161544 ± 0.00000058
eccentricity 0.99992492 ± 0.00000171
argument of perihelion [°] 134.287478 ± 0.000088
ascending node [°] 91.121945 ± 0.000029
inclination [°] 34.478954 ± 0.000009
reciprocal semi-major axis [10-6 au-1] 38.47 ± 0.88
file containing 5001 VCs swarm
2018c2n4.bmi
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.