C/2015 X5 PANSTARRS
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Comet C/2015 X5 was discovered on 6 December 2015 with Pan-STARRS 1 telescope (Haleakala), that is almost 2 years before its perihelion passage.

Comet had its closest approach to the Earth on 4 January 2018 (5.909 au); 4 days after its perihelion passage.

The preferred solution given here is based on data spanning over 4.19 yr in a range of heliocentric distances: 8.38 au – 6.80 au (perihelion) – 8.45 au.

This Oort spike comet suffers tiny planetary perturbations.
solution description
number of observations 171
data interval 2015 12 06 – 2018 02 08
data arc selection data generally limited to pre-perihelion (PRE)
range of heliocentric distances 8.38 au – 6.80 au (perihelion) – 6.81 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 332
RMS [arcseconds] 0.22
orbit quality class 1a+
orbital elements (barycentric ecliptic J2000)
Epoch 2326 08 16
perihelion date 2017 12 30.17860635 ± 0.00093856
perihelion distance [au] 6.80490182 ± 0.00000509
eccentricity 0.99974900 ± 0.00000391
argument of perihelion [°] 27.644158 ± 0.000074
ascending node [°] 122.278397 ± 0.000004
inclination [°] 124.298817 ± 0.00001
reciprocal semi-major axis [10-6 au-1] 36.89 ± 0.57