C/1955 G1 Abell
more info
Comet C/1955 G1 was discovered on 13 April 1955, a year and three weeks after perihelion passage, and was last seen on 30 April 1956 [Kronk, Cometography: Volume 4].
The comet made two close approaches to the Earth: on 24 July 1953 (4.09 au, eight months before perihelion passage), and on 21 May 1954 (4.03 au, two months after perihelion).
Solution given here is based on data spanning over 1.1 yr in a range of heliocentric distances from 5.45 au to 7.42 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbit).
See also Królikowska and Dybczyński 2017.

solution description
number of observations 35
data interval 1955 04 13 – 1956 04 30
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 5.45 au – 7.42au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting NO
number of residuals 63
RMS [arcseconds] 1.00
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 1954 04 08
perihelion date 1954 03 24.11491792 ± 0.01172030
perihelion distance [au] 4.49562524 ± 0.00010953
eccentricity 1.00279180 ± 0.00007595
argument of perihelion [°] 73.749143 ± 0.001855
ascending node [°] 321.334541 ± 0.000335
inclination [°] 123.932726 ± 0.00028
recip semi-major axis [10-6 au-1] -621.00 ± 16.90
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