C/1946 P1 Jones
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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 (heliocentric ecliptic J2000)
Epoch 1946 10 27
perihelion date 1946 10 26.77875894 ± 0.00049759
perihelion distance [au] 1.13610604 ± 0.00000296
eccentricity 1.00076873 ± 0.00000562
argument of perihelion [°] 320.412716 ± 0.000277
ascending node [°] 238.335364 ± 0.000188
inclination [°] 56.964608 ± 0.000062
reciprocal semi-major axis [10-6 au-1] -676.64 ± 4.94
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.