C/1946 P1 Jones
more info
Comet C/1946 P1 was discovered on 6 August 1946 by Albert F.A.L. Jones (Timaru, New Zealand), that is 3.7 months before its perihelion passage, and the comet was last seen on 23 November 1948 [Kronk, Cometography: Volume 4].
This comet made its closest approach to the Earth on 4 October 1946 (1.913 au), that is about three weeks before its perihelion passage.
Solution given here is based on data spanning over 2.279 yr in a range of heliocentric distances from 1.625 au through perihelion (1.136 au) to 8.170 au.
This Oort spike comet suffers very slight planetary perturbations during its passage through the planetary system, and in the next passage through the perihelion it will enter the planet zone as Oort spike comet (see future barycentric orbits given here).
More details in Królikowska et al. 2014.

solution description
number of observations 144
data interval 1946 08 13 – 1948 11 23
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 1.62 au – 1.14 au (perihelion) – 8.17 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 257
RMS [arcseconds] 0.99
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 2245 06 21
perihelion date 1946 10 26.92277872 ± 0.00050934
perihelion distance [au] 1.13244087 ± 0.00000300
eccentricity 0.99997447 ± 0.00000575
argument of perihelion [°] 320.262683 ± 0.000284
ascending node [°] 238.420478 ± 0.000193
inclination [°] 56.958209 ± 0.000063
reciprocal semi-major axis [10-6 au-1] 22.54 ± 5.08
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 future swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.