C/2017 AB5 PANSTARRS
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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.
Solution given here is based on data spanning over 1.29 yr in a range of heliocentric distances: 9.50 au – 9.216 au (perihelion) – 9.22 au (18 April 2018).
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system and will have a 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 YES
number of residuals 130
RMS [arcseconds] 0.33
orbit quality class 1a
orbital elements (heliocentric ecliptic J2000)
Epoch 2018 02 11
perihelion date 2018 02 18.14777758 ± 0.17149717
perihelion distance [au] 9.21622360 ± 0.00013333
eccentricity 0.99992136 ± 0.00003676
argument of perihelion [°] 78.409754 ± 0.008907
ascending node [°] 42.689610 ± 0.000410
inclination [°] 32.430845 ± 0.000087
recip semi-major axis [10-6 au-1] 8.53 ± 3.99
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