C/1960 M1 Humason
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Comet C/1960 M1 was discovered on 18 June 1960, 6.5 months after perihelion passage, and was last seen on 7 June 1961 [Kronk and Meyer, Cometography: Volume 5].
The comet made its closest approach to the Earth on 16 May 1960 (3.91 au), about one month before discovery.
Solution given here is based on data spanning over 0.98 yr in a range of heliocentric distances from 4.56 au to 6.11 au.
This Oort spike comet suffers slight planetary perturbations during its passage through the planetary system but these perturbations can lead to escape of the comet from the solar system.
See also Królikowska and Dybczyński 2017.

solution description
number of observations 34
data interval 1960 06 23 – 1961 06 07
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 4.56 au – 6.11au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 65
RMS [arcseconds] 1.42
orbit quality class 1b
previous orbit elements (barycentric ecliptic J2000)
no. of returning VCs in the swarm 4964 *
no. of escaping VCs in the swarm 37
no. of hyperbolas among escaping VCs in the swarm 0
previous recip semi-major axis [10-6 au-1] 44.34 ± 10.38 R
previous perihelion distance [au] 47.937 – 54.675 – 92.775 R
previous aphelion distance [103 au] 34.6 – 45.2 – 64.9 R
time interval to previous perihelion [Myr] 2.249 – 3.383 – 5.847 R
percentage of VCs with q > 20100
dynamical status definitely dynamically new (DN+)
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On stellar perturbations
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.