C/2017 K1 PANSTARRS
more info
Comet C/2017 K1 was discovered on 21 May 2017 with Pan-STARRS 1 telescope (Haleakala), that is about 10 months before its perihelion passage. Next, three pre-discovery measurements were found going back to 1 September 2015. This comet was observed until 27 May 2019.

Comet had its closest approach to the Earth on 29 April 2018 (6.286 au), about 1.5 months after its perihelion passage.

The preferred solution given here is based on data spanning over 3.73 yr in a range of heliocentric distances: 9.28 au – 7.29 au (perihelion) – 7.80 au.

This Oort spike comet suffers tiny planetary perturbations during its passage through the planetary system that likely lead to a bit tighter future orbit (see future barycentric orbits).
solution description
number of observations 138
data interval 2015 09 01 – 2019 05 27
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 9.28 au – 7.29 au (perihelion) – 7.8 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 268
RMS [arcseconds] 0.23
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] 74.79 – 75.89 – 77.03
next perihelion distance [au] 8.09 – 8.43 – 8.77
next aphelion distance [103 au] 26 – 26.3 – 26.7
time interval to next perihelion [Myr] 1.52 – 1.55 – 1.59
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] 73.55 – 74.57 – 75.62
next perihelion distance [au] 5.907 – 5.968 – 6.028
next aphelion distance [103 au] 26.4 – 26.8 – 27.2
time interval to next perihelion [Myr] 1.52 – 1.55 – 1.58
percentage of VCs with qnext < 10100