C/1942 C2 Oterma
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Comet C/1942 C2 was discovered on 12 February 1942, about 7.5 months before perihelion passage and was last seen on 9 March 1943 [Kronk, Cometography: Volume 4].
This comet made its closest approach to the Earth on 29 December 1942 (3.21 au), that is three months after perihelion passage.
Solution given here is based on data spanning over 1.07 yr in a range of heliocentric distances from 4.53 au through perihelion (4.11 au) to 4.35 au.
Pure gravitational orbit determined from all available positional measurements (47 observations) give slightly hyperbolic original barycentric orbit (1b-class orbit); also original orbit given in Minor Planet Center is hyperbolic (35 obs. used, 2-days shorter arc of data; 1B-class orbit, see MPC).
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to escape the comet from the solar system on a hyperbolic orbit (see future barycentric orbit).
More details in Królikowska et al. 2014 andKrólikowska and Dybczyński 2017.

solution description
number of observations 47
data interval 1942 02 12 – 1943 03 11
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 4.53 au – 4.11 au (perihelion) – 4.35 au
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 88
RMS [arcseconds] 1.57
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 1942 10 08
perihelion date 1942 09 27.28002500 ± 0.00770300
perihelion distance [au] 4.11339144 ± 0.00003196
eccentricity 1.00316671 ± 0.00005609
argument of perihelion [°] 163.620216 ± 0.001441
ascending node [°] 281.038570 ± 0.000853
inclination [°] 172.514474 ± 0.000124
recip semi-major axis [10-6 au-1] -769.85 ± 13.62
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