C/1978 H1 Meier
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Comet C/1978 H1 was discovered on 26 April 1978 by Rolf G.W. Meier (Ottawa, Canada), that is about 6.5 months before its perihelion passage.This comet was last observed in December 1979.
Comet had its closest approach to the Earth on 21 November 1978 (2.005 au), 10 days after its perihelion passage.
Solutions given here are based on data spanning over 1.62 yr in a range of heliocentric distances: 3.00 au – 1.137 au (perihelion) – 5.02 au.
This Oort spike comet suffers large planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet from the solar system on hyperbolic orbit.
See also Królikowska 2014 and Królikowska 2020.

solution description
number of observations 286
data interval 1978 04 28 – 1979 12 09
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 3 au – 1.14 au (perihelion) – 5.02 au
detectability of NG effects in the comet's motion comet with determinable NG~orbit
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 565
RMS [arcseconds] 1.04
orbit quality class 1a
orbital elements (barycentric ecliptic J2000)
Epoch 1680 04 03
perihelion date 1978 11 10.59422848 ± 0.00021765
perihelion distance [au] 1.12977510 ± 0.00000128
eccentricity 0.99997312 ± 0.00000273
argument of perihelion [°] 231.438258 ± 0.000053
ascending node [°] 349.549609 ± 0.000058
inclination [°] 43.759905 ± 0.000065
recip semi-major axis [10-6 au-1] 23.79 ± 2.42
file containing 5001 VCs swarm
1978h1a1.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.