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 (heliocentric ecliptic J2000)
Epoch 1956 01 08
perihelion date 1956 01 26.66512601 ± 0.00079697
perihelion distance [au] 4.07687153 ± 0.00000441
eccentricity 1.00466934 ± 0.00001072
argument of perihelion [°] 57.297597 ± 0.000103
ascending node [°] 72.872267 ± 0.000037
inclination [°] 79.599992 ± 0.000048
recip semi-major axis [10-6 au-1] -1,145.32 ± 2.63
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