C/2015 R3 PANSTARRS
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Comet C/2015 R3 was discovered on 12 September 2015 with Pan-STARRS 1 telescope (Haleakala), that is about 1.6 yr after its perihelion passage. After some time pre-discovery data were found going back to 5 March 2013. This comet was rarely observed until 28 September 2016.

Comet had its closest approach to the Earth on 8 May 2015 (4.939 au), a week after its perihelion passage.

We recommended GR solution spanning over 3.57 yr in a range of heliocentric distances from 5.57 au – 4.90 au (perihelion) – 8.54 au as the preferred orbit( solution 'b1'), because radial component of NG~acceleration is negative in solution 'bc'.

This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to a more tight future orbit with a semimajor axis larger than 10000 au (see future barycentric orbits).
solution description
number of observations 44
data interval 2013 03 05 – 2016 09 28
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 5.57 au – 4.90 au (perihelion) – 8.54 au
detectability of NG effects in the comet's motion comet with determinable NG~orbit
type of model of motion GR - gravitational orbit
data weighting NO
number of residuals 83
RMS [arcseconds] 0.54
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 1708 07 26
perihelion date 2014 02 11.09959043 ± 0.00423660
perihelion distance [au] 4.90327863 ± 0.00001854
eccentricity 0.99977266 ± 0.00002081
argument of perihelion [°] 271.988537 ± 0.000413
ascending node [°] 36.427556 ± 0.000056
inclination [°] 83.532052 ± 0.000088
reciprocal semi-major axis [10-6 au-1] 46.36 ± 4.24