C/1978 H1 Meier
more info
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
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 565
RMS [arcseconds] 1.00
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 1978 11 28
perihelion date 1978 11 11.40877475 ± 0.00023603
perihelion distance [au] 1.13650660 ± 0.00000288
eccentricity 1.00079425 ± 0.00000972
argument of perihelion [°] 231.401425 ± 0.000104
ascending node [°] 349.344859 ± 0.000060
inclination [°] 43.761723 ± 0.000084
recip semi-major axis [10-6 au-1] -698.85 ± 8.55
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/day2] 1.2917 ± 0.1982
A2 [10-8au/day2] 0.41505 ± 0.12476
A3 [10-8au/day2] 0 (assumed)
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113