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
next orbit elements (barycentric ecliptic J2000)
no. of returning VCs in the swarm 0
no. of escaping VCs in the swarm 5001
no. of hyperbolas among escaping VCs in the swarm 5001 *
next recip semi-major axis [10-6 au-1] -229.08 ± 2.66
next perihelion distance [au] 2.359 ± 0.007
synchronous stop epoch [Myr] 1.105 S
percentage of VCs with q < 10100
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