Galactic and stellar perturbations of long period comet motion -- Practical considerations

Dybczyński, Piotr A.; Breiter, Sławomir

doi:10.48550/arxiv.2109.07549

Cited by 1 publication

(3 citation statements)

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“…Additionally, for the preferred solutions, we performed simulations to observe the effects of stellar uncertainties in various cases. To this purpose, we extensively use the methods proposed recently by Dybczyński & Breiter (2021) and the stellar data from the latest release 3.1 of the StePPeD database.…”

Section: Dealing With the Uncertaintiesmentioning

confidence: 99%

“…This set of clones has been propagated numerically back and forth to obtain original and future swarms of barycentric orbit clones. Investigating the previous (or next) orbit, we repeat the backward (or forward) numerical integration for each comet clone exactly as described in Dybczyński & Breiter (2021), using the published stellar ephemerides. In all cases, we take into account both the overall Galactic gravitational potential and stellar perturbations from a set of 407 potential perturbers.…”

Section: Dealing With the Uncertaintiesmentioning

confidence: 99%

“…It is widely accepted that for investigating the long-term dynamical evolution of so much elongated orbits, far outside our planetary system, it is necessary to take into account both Galactic and stellar perturbations. A new, reliable, precise, and fast method of calculating the effect of these perturbations on LPC motion has recently been proposed by Dybczyński & Breiter (2021). We use these methods in what follows.…”

Section: Introductionmentioning

confidence: 99%

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The influence of individual stars on the long-term dynamics of comets C/2014 UN271 and C/2017 K2

Dybczyński,

Królikowska

2021

Preprint

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Context. In June 2021 the discovery of an unusual comet C/2014 UN 271 Bernardinelli-Bernstein has been announced. Its cometary activity beyond Uranus orbit also has refreshed interest in similar objects, including C/2017K2 PanSTARRS. Another peculiarity of these objects is the long interval of positional data, taken at large heliocentric distances. Aims. These two comets are suitable candidates for a detailed investigation of their long-term motion outside the planetary zone. Using the carefully selected orbital solutions, we aim at estimating the orbital parameters of their orbits at the previous perihelion passage. This might allow us to discriminate between dynamically old and new comets. Methods. To follow the dynamical evolution of long-period comets far outside the planetary zone, it is necessary to take into account both the perturbation caused by the overall Galactic gravitational potential and the actions of individual stars appearing in the solar neighborhood. To this aim, we applied the recently published methods based on stellar perturbers ephemerides. Results. For C/2014 UN 271 we obtained a precise orbital solution that can be propagated to the past and to the future. For C/2017 K2 we have to limit ourselves to study only the past motion since some signs of nongravitational effects can be found in recent positional observations. Therefore, we use a specially selected orbital solution suitable for past motion studies. Using these starting orbits, we propagated both comets to their previous perihelia. We also investigated the future motion of C/2014 UN 271 . Conclusions. Orbital evolution of these two comets appears to be sensitive to perturbations from several stars that closely approach the Sun. Unfortunately, some of these stars have 6D data with uncertainties too large to obtain definitive results for the studied comets; however, it appears that both comets were probably outside the planetary zone in the previous perihelion.

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Section: Dealing With the Uncertaintiesmentioning

confidence: 99%

Section: Dealing With the Uncertaintiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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