C/1925 W1 Van Biesbroeck
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Comet C/1925 W1 was discovered on 17 November 1925 by George Van Biesbroeck (Yerkes Observatory, Wisconsin, USA), that is 1.5 month after perihelion passage, and the comet was last seen on 10 June 1926 [Kronk, Cometography: Volume 3].
This comet made its closest approach to the Earth on 29 January 1926 (1.351 au), that is 2.3 months after its discovery.
Solution given here is based on data spanning over 0.562 yr in a range of heliocentric distances from 1.69 au to 3.48 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbit given here).
This comet was in the original sample of 19 comets used by Oort for his hypothesis on LPCs, and according to presented here statistics for previous perihelion passage this comet most probably is dynamically new.
More details in Królikowska et al. 2014.

solution description
number of observations 342
data interval 1925 11 17 – 1926 06 10
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 1.57 au – 3.47au
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 593
RMS [arcseconds] 1.94
orbit quality class 1b
previous orbit elements (barycentric ecliptic J2000)
no. of returning VCs in the swarm 4640 *
no. of escaping VCs in the swarm 361
no. of hyperbolas among escaping VCs in the swarm 2
previous recip semi-major axis [10-6 au-1] 21.06 – 31.35 – 42.35 R
previous perihelion distance [au] 53.707 – 81.487 – 296.643 R
previous aphelion distance [103 au] 47.2 – 63.7 – 94.7 R
time interval to previous perihelion [Myr] 3.612 – 5.678 – 10.144 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.