C/1981 G1 Elias
more info
Comet C/1981 G1 was discovered by Jonathan H. Elias (Cerro Tololo Interamerican Observatory) on 3 April 1981 (IAUC 3592), 4.5 months before perihelion, and was last seen on 14 April 1983.
The comet made its closest approach to the Earth on 22 March 1982 (4.12 au), that was seven months after perihelion.
Solution given here is based on data spanning over 2.03 yr in a range of heliocentric distances: 4.86 au – 4.74 au (perihelion) – 6.62 au.
This comet suffered small planetary perturbations during its passage through the planetary system that could lead to escape of the comet from the solar system (future barycentric orbit).
See also Królikowska and Dybczyński 2017.

solution description
number of observations 27
data interval 1981 04 03 – 1983 04 14
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 4.86 au – 4.74 au (perihelion) – 6.62 au
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 47
RMS [arcseconds] 1.32
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 1675 04 30
perihelion date 1981 08 19.49750833 ± 0.00641590
perihelion distance [au] 4.73791979 ± 0.00003626
eccentricity 0.99934341 ± 0.00005003
argument of perihelion [°] 310.302998 ± 0.000786
ascending node [°] 176.647202 ± 0.000123
inclination [°] 115.293045 ± 0.000143
reciprocal semi-major axis [10-6 au-1] 138.58 ± 10.56
file containing 5001 VCs swarm
1981g1a1.bmi
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.