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Comet C/2015 J1 was discovered on 14 May 2015 with Pan-STARRS 1 telescope (Haleakala), that is about 10.5 months after its perihelion passage.This comet was rather rarely observed until 7 June 2016.
Comet had its closest approach to the Earth on 15 May 2014 (5.421 au), about 1.5 months before its perihelion passage. At the moment of its discovery the comet was about 2 weeks after its second close encounter with the Earth (5.428 au on 27 April 2015).
Solution given here is based on data spanning over 1.07 yr in a range of heliocentric distances from 6.42 au to 7.73 au.
This comet suffers slight planetary perturbations during its passage through the planetary system; have orignal semimajor axis shorter than 10000 au and slightly tighter future orbit. (see future barycentric orbit).

solution description
number of observations 54
data interval 2015 05 14 – 2016 06 07
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 6.42 au – 7.73au
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 104
RMS [arcseconds] 0.33
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 1706 03 19
perihelion date 2014 06 30.55751486 ± 0.00987866
perihelion distance [au] 6.01779573 ± 0.00006508
eccentricity 0.99928269 ± 0.00002973
argument of perihelion [°] 315.541212 ± 0.001222
ascending node [°] 220.002887 ± 0.000018
inclination [°] 95.03722 ± 0.000071
recip semi-major axis [10-6 au-1] 119.20 ± 4.94
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 original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.