C/1980 E1 Bowell
more info
Comet C/1980 E1 was discovered on 13 March 1980, two years before its perihelion passage, and was last seen on 30 December 1986 [Kronk and Meyer, Cometography: Volume 5]; later few prediscovery measurements going one month back to 11 February 1979 were found.
The comet made its closest approach to the Earth on 14 June 1982 (2.48 au), that was three months after its perihelion passage.
Solutions given here are based on data spanning over 6.88 yr in a range of heliocentric distances from: 7.47 au – 3.17 au (perihelion) – 13.91 au.
This Oort spike comet suffers very strong planetary perturbations during its passage through the planetary system – the strongest ever noticed in the motion of actual near-parabolic comets. These perturbations lead to escape of the comet from the solar system on hiperbolic orbit with the eccentricity of 1.054 (see future barycentric orbit).
See also Królikowska 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 203
data interval 1980 02 11 – 1986 12 30
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 7.47 au – 3.36 au (perihelion) – 13.9 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 387
RMS [arcseconds] 1.06
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 1982 03 12
perihelion date 1982 03 12.29475500 ± 0.00043800
perihelion distance [au] 3.36388555 ± 0.00000955
eccentricity 1.05725600 ± 0.00001080
argument of perihelion [°] 135.085598 ± 0.000892
ascending node [°] 114.555728 ± 0.000890
inclination [°] 1.661772 ± 0.000025
recip semi-major axis [10-6 au-1] -17,020.79 ± 3.13
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
non-gravitational parameters
A1 [10-8au\day-2] 1095 ± 181
A2 [10-8au\day-2] 535.89 ± 93.1
A3 [10-8au\day-2] 0 (assumed)
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113