C/1935 Q1 Van Biesbroeck
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Comet C/1935 Q1 was discovered on 21 August 1935, about 7.5 months before perihelion passage, and soon a few prediscovery images were found (taken at Union Observatory in South Africa) extending arc to 3 July 1935; comet was last seen on 26 January 1938 [Kronk, Cometography: Volume 4].
This comet made two close approaches to the Earth, on 4 August 1935 (3.70 au) and on 6 August 1936 (3.62 au).
Solution given here is based on data spanning over 2.30 yr in a range of heliocentric distances from 4.83 au through perihelion (4.04 au) to 6.06 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system; however, they lead to escape the comet from the solar system on a hiperbolic orbit (see future barycentric orbit).
More details in Królikowska et al. 2014 andKrólikowska and Dybczyński 2017.

solution description
number of observations 131
data interval 1935 07 03 – 1937 11 12
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 4.83 au – 4.04 au (perihelion) – 6.06 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 250
RMS [arcseconds] 1.49
orbit quality class 1a
next orbit statistics, both Galactic and stellar perturbations were taken into account
no. of returning VCs in the swarm 0
no. of escaping VCs in the swarm 5001
no. of hyperbolas among escaping VCs in the swarm 5001 *
next reciprocal semi-major axis [10-6 au-1] -292.01 – -285.39 – -278.70
next perihelion distance [au] 3.273 – 3.285 – 3.297
synchronous stop epoch [Myr] 0.995 S
percentage of VCs with qnext < 10100
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.
next orbit statistics, here only the Galactic tide has been included
no. of returning VCs in the swarm 0
no. of escaping VCs in the swarm 5001
no. of hyperbolas among escaping VCs in the swarm 5001 *
next reciprocal semi-major axis [10-6 au-1] -291.94 – -285.33 – -278.63
next perihelion distance [au] 4.411 – 4.43 – 4.45
synchronous stop epoch [Myr] 1.05 S
percentage of VCs with qnext < 10100