C/1992 A1 Helin-Alu
more info
Comet C/1992 A1 was discovered on 9 January 1992 by Eleanor F. Helin and Jeff Alu during the course of the near-Earth asteroid survey (Mount Palomar, California, USA),that is about 6 months before its perihelion passage. This comet was last observed in the second half of March 1993.
Comet had its closest approach to the Earth on 6 February 1992 (2.448 au), about a month after its discovery.
Solution given here is based on data spanning over 1.20 yr in a range of heliocentric distances: 3.50 au – 3.02 au (perihelion) – 3.92 au.
This Oort spike comet suffers tiny planetary perturbations during its passage through the planetary system; however, these perturbations lead to escape the comet on hyperbolic orbit from the planetary zone.
See also Królikowska 2020.

solution description
number of observations 56
data interval 1992 01 09 – 1993 03 23
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 3.5 au – 3.02 au (perihelion) – 3.92 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 107
RMS [arcseconds] 1.34
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 1992 06 27
perihelion date 1992 07 08.69130154 ± 0.00610829
perihelion distance [au] 3.01663161 ± 0.00002328
eccentricity 1.00431371 ± 0.00007035
argument of perihelion [°] 239.844237 ± 0.001253
ascending node [°] 288.903079 ± 0.000162
inclination [°] 39.264157 ± 0.000228
reciprocal semi-major axis [10-6 au-1] -1,429.98 ± 23.30
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.