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
type of model of motion NC - non-gravitational orbits for symmetric CO-g(r)-like function
data weighting YES
number of residuals 83
RMS [arcseconds] 0.52
orbit quality class 1a
next orbit statistics, both Galactic and stellar perturbations were taken into account
no. of returning VCs in the swarm 5001 *
no. of escaping VCs in the swarm 0
no. of hyperbolas among escaping VCs in the swarm 0
next reciprocal semi-major axis [10-6 au-1] 219.72 – 230.27 – 240.56
next perihelion distance [au] 4.8895 – 4.892 – 4.8939
next aphelion distance [103 au] 8.31 – 8.68 – 9.1
time interval to next perihelion [Myr] 0.268 – 0.286 – 0.307
percentage of VCs with qnext < 10100
next orbit statistics, here only the Galactic tide has been included
no. of returning VCs in the swarm 5001 *
no. of escaping VCs in the swarm 0
no. of hyperbolas among escaping VCs in the swarm 0
next reciprocal semi-major axis [10-6 au-1] 219.72 – 230.27 – 240.56
next perihelion distance [au] 4.8843 – 4.8868 – 4.8888
next aphelion distance [103 au] 8.31 – 8.68 – 9.1
time interval to next perihelion [Myr] 0.268 – 0.286 – 0.307
percentage of VCs with qnext < 10100