C/1981 G1 Elias
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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 (heliocentric ecliptic J2000)
Epoch 1981 08 24
perihelion date 1981 08 18.22800991 ± 0.00641791
perihelion distance [au] 4.74252441 ± 0.00003683
eccentricity 1.00067550 ± 0.00005090
argument of perihelion [°] 310.241141 ± 0.000783
ascending node [°] 176.705296 ± 0.000122
inclination [°] 115.31023 ± 0.000144
recip semi-major axis [10-6 au-1] -142.43 ± 10.73
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