C/1979 M1 Bradfield
more info
Comet C/1979 M1 was discovered on 24 June 1979 by William A. Bradfield (Dernancourt, South Australia, Australia), that is a month before its perihelion passage. This comet was last observed in late September 1979.
Comet had its closest approach to the Earth on 15 September 1979 (0.431 au), less than two months after perihelion passage.
Solutions given here are based on data spanning over 0.249 yr in a range of heliocentric distances: 0.80 au – 0.413 au (perihelion) – 1.44 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system; these perturbations lead to a little more tight future orbit.
See also Królikowska 2020.

solution description
number of observations 35
data interval 1979 06 25 – 1979 09 24
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 0.8 au – 0.41 au (perihelion) – 1.44 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 68
RMS [arcseconds] 3.28
orbit quality class 2a
orbital elements (barycentric ecliptic J2000)
Epoch 1682 01 03
perihelion date 1979 07 22.90269304 ± 0.00017693
perihelion distance [au] 0.40945059 ± 0.00000283
eccentricity 0.99998375 ± 0.00001343
argument of perihelion [°] 47.699160 ± 0.000686
ascending node [°] 164.121731 ± 0.000603
inclination [°] 136.22899 ± 0.000778
reciprocal semi-major axis [10-6 au-1] 39.69 ± 32.80
file containing 5001 VCs swarm
1979m1a2.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.