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Comet C/2017 AB5 was discovered on 3 January 2017 with Pan-STARRS 1 telescope (Haleakala), that is more than a year before its perihelion passage. This comet was rather rarely observed until 25 April 2019.

Comet had its closest approach to the Earth on 18 January 2018 (8.395 au), about a month before its perihelion passage.

The preferred solution given here is based on data spanning over 2.31 yr in a range of heliocentric distances: 9.50 au – 9.22 au (perihelion) – 9.53 au.

This Oort spike comet suffers small planetary perturbations during its passage through the planetary system and will have a bit more tight future orbit (see future barycentric orbit).
solution description
number of observations 69
data interval 2017 01 03 – 2018 04 18
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 9.5 au – 9.22 au (perihelion) – 9.22 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 130
RMS [arcseconds] 0.33
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 2332 07 15
perihelion date 2018 02 16.93891226 ± 0.16991071
perihelion distance [au] 9.22187861 ± 0.00013203
eccentricity 0.99842767 ± 0.00003647
argument of perihelion [°] 78.414984 ± 0.008817
ascending node [°] 42.623231 ± 0.000404
inclination [°] 32.417103 ± 0.000086
reciprocal semi-major axis [10-6 au-1] 170.50 ± 3.95
file containing 5001 VCs swarm
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.
Six 2D-projections of the 6D space of future swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.