C/1952 W1 Mrkos
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Comet C/1952 W1 was discovered on 28 November 1952 by Antonin Mrkos (Skalnaté Pleso Observatory, Slovakia), that is almost 2 months before its perihelion passage. It was observed until 5 September 1953 [Kronk, Cometography: Volume 4].
Comet had its closest approach to the Earth on 10 January 1953 (0.922 au), two weeks before its perihelion passage.
Original value of 1/a is negative; however, within its uncertainty of 1 sigma this comet could come from the Oort Cloud.
This comet suffers small planetary perturbations during its passage through the planetary system; these perturbations can lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
See also 2011 and Królikowska 2014.

solution description
number of observations 31
data interval 1952 12 10 – 1953 07 18
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 1.16 au – 0.78 au (perihelion) – 2.86 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting NO
number of residuals 58
RMS [arcseconds] 0.87
orbit quality class 2a
orbital elements (barycentric ecliptic J2000)
Epoch 1655 09 22
perihelion date 1953 01 24.01011454 ± 0.00096402
perihelion distance [au] 0.77525810 ± 0.00002929
eccentricity 1.00003263 ± 0.00005295
argument of perihelion [°] 253.925040 ± 0.002757
ascending node [°] 343.653776 ± 0.000719
inclination [°] 97.161992 ± 0.000679
reciprocal semi-major axis [10-6 au-1] -42.09 ± 68.30
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 original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.