C/2017 F1 Lemmon
more info
Comet C/2017 F1 was discovered on 20 March 2017 with Mount Lemmon survey, that is about 8.5 months before its perihelion passage. Later single pre-discovery obsebation was found from 4 February 2017. This comet was rather rarely observed until 18 March 2018.

Comet had its closest approach to the Earth on 24 December 2017 (3.480 au), less than a month after its perihelion passage.

The preferred solution given here is based on data spanning over 1.12 yr in a range of heliocentric distances: 5.10 au – 4.50 au (perihelion) – 4.58 au.

This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
solution description
number of observations 84
data interval 2017 03 20 – 2018 02 17
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 4.95 au – 4.50 au (perihelion) – 4.54 au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting NO
number of residuals 155
RMS [arcseconds] 0.41
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 2017 11 23
perihelion date 2017 11 30.98962959 ± 0.00626776
perihelion distance [au] 4.49976347 ± 0.00001238
eccentricity 1.00436273 ± 0.00002416
argument of perihelion [°] 64.815961 ± 0.000835
ascending node [°] 158.742618 ± 0.000102
inclination [°] 146.481068 ± 0.000052
reciprocal semi-major axis [10-6 au-1] -969.55 ± 5.36
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.