C/1954 Y1 Haro-Chavira
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Comet C/1954 Y1 was discovered on 18 December 1954, about one year before perihelion passage, and was last seen on 15 May 1958 [Kronk, Cometography: Volume 4].
The comet made its closest approach to the Earth on 9 December 1955 (3.51 au), almost seven weeks before perihelion passage.
Solution given here is based on data spanning over 3.3 yr in a range of heliocentric distances: 5.16 au – 4.08 au (perihelion) – 7.79 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to escape the comet from the solar system on a hyperbolic orbit (see future barycentric orbit).
See also Królikowska and Dybczyński 2017.

solution description
number of observations 97
data interval 1955 01 13 – 1958 05 15
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 5.16 au – 4.08 au (perihelion) – 7.79 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 181
RMS [arcseconds] 0.98
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 1652 02 10
perihelion date 1956 01 27.13932759 ± 0.00081614
perihelion distance [au] 4.07097096 ± 0.00000452
eccentricity 0.99984448 ± 0.00001082
argument of perihelion [°] 57.447014 ± 0.000104
ascending node [°] 72.821449 ± 0.000037
inclination [°] 79.681137 ± 0.000048
reciprocal semi-major axis [10-6 au-1] 38.20 ± 2.66
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.