C/2018 U1 Lemmon
more info
Comet C/2018 U1 was discovered on 27 October 2019, almost four years before its perihelion passage and is still observed (September 2023, 6.64 au from the Sun).

Currently, the solutions (GR and NG) given here are based on pre-perihelion data and span over 3.94 yr in a range of heliocentric distances: 9.33 au – 5.00 au (perihelion).
solution description
number of observations 2289
data interval 2019 02 08 – 2021 06 18
data arc selection data generally limited to pre-perihelion (PRE)
range of heliocentric distances 9.33 au – 5au
type of model of motion NC - non-gravitational orbits for symmetric CO-g(r)-like function
data weighting YES
number of residuals 4524
RMS [arcseconds] 0.35
orbit quality class 1a+
orbital elements (barycentric ecliptic J2000)
Epoch 1715 11 07
perihelion date 2021 11 02.20296117 ± 0.00127473
perihelion distance [au] 4.98823737 ± 0.00000500
eccentricity 0.99964716 ± 0.00000461
argument of perihelion [°] 180.420207 ± 0.000093
ascending node [°] 75.387008 ± 0.000018
inclination [°] 108.296284 ± 0.000008
reciprocal semi-major axis [10-6 au-1] 70.73 ± 0.93
file containing 5001 VCs swarm
2018u1pc.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.