Maximum non-gravitational acceleration due to out-gassing cometary nuclei

Yabushita, Shin

doi:10.1007/bf00113834

Cited by 11 publications

(11 citation statements)

References 3 publications

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“…In the case of these three dynamically young comets the g S (r)-law or g(r)-like law with r 0 2.808 AU give the same rms as f (r), which further confuses the issue. However, the extremely large values of A 1 for C/1998 P1 Williams and C/1993 A1 Mueller are unrealistic in terms of the water sublimation (Whipple 1978;Yabushita 1991). This supports the idea that more volatile molecules than water play an important role in the orbital departure from the gravitational path for these two comets.…”

Section: Which Form Of H(r)mentioning

confidence: 79%

“…speculated that the number of hyperbolic original orbits could be overestimated due to omission of the NG effects. In the 1990s, Yabushita (1991) and Bolatto et al (1995) considered the NG perturbation in a comet's energy per orbital revolution. They concluded that these perturbations are too small to explain the negative excess of the original binding energy of "hyperbolic" comets.…”

Section: Introductionmentioning

confidence: 99%

“…The next problem is related to the unacceptably large values of the standard NG parameter A 1 determined from the observations. This problem also has been known for a long time (Whipple 1977;Yabushita 1991Yabushita , 1996.…”

Section: Introductionmentioning

confidence: 99%

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Long-period comets with non-gravitational effects

Królikowska¹

2004

A&A

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Abstract. The influence of non-gravitational effects on the motion of long-period comets is analyzed. Investigations were performed for about 60 nearly-parabolic comets discovered during the last thirty years. All three non-gravitational parameters A 1 , A 2 , A 3 were detected in the motion of 19 comets on the basis of positional observations only. For these comets the standard g(r) function as well as some of its modifications were used to model the ice sublimation from the cometary nucleus. For 14 of 19 comets the orientation of spin axes of the nucleus were also determined. Finally, the magnitude of the nongravitational effects derived for the long-period comets have been compared with observed the non-gravitational perturbations on periodic comets.

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Section: Which Form Of H(r)mentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

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Long-period comets with non-gravitational effects

Królikowska¹

2004

A&A

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“…After introducing the perihelion asymmetry in this model, see for example Sitarski (1994), one can obtain both positive and negative displacement of the NGF maximum with respect to the perihelion which again on average would reduce to zero. The opinion that NGFs systematically change long-period cometary orbits (see for example Marsden et al (1978); Yabushita (1991Yabushita ( , 1996) comes partly from the fact that the authors mostly concentrate on the "incoming" half of the cometary orbit, trying to explain negative values of 1/a orig . The importance of NGF pointed out by Emel'yanenko & Bailey (1998) comes from the fact, that they use constant NGF parameters and accumulate their effect during thousands of revolutions while we are estimating here the effect of the planetary system during a single perihelion passage.…”

Section: Problem Of Non-gravitational Forcesmentioning

confidence: 99%

The transparency of the Solar System to the Oort cloud comets

Dybczyński¹

2004

A&A

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Abstract. In long-term Monte Carlo simulations of the dynamics of the Oort cloud planetary perturbations cannot be taken directly into account. To do this we propose a simple approximation: estimating the Solar System transparency coefficient P measuring the probability for a comet to be removed from the cloud by planetary perturbations during a single perihelion passage. We estimated the value of this coefficient from the observed and artificial cometary samples. We excluded nongravitational forces fom our calculations. We obtained P 0.25 for inner cloud comets and P 0.5 for the outer and most active part of the cloud. The dependency of P on the comet observability limit OL is also presented for various cometary samples.

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“…According to Yabushita (1991) there is statistical evidence that some of the new comets -those with original values of 1/a < -4 χ 10~5AU…”

Section: Observed Populationsmentioning

confidence: 99%

Comets (Existing Populations)

Kresák¹

1994

Symp. - Int. Astron. Union

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Abstract. The definition, population, extent, origin and evolution of the individual subsystems of comets and transitions between them are discussed, together with presentation of the relevant statistical data and their changes with time. The largest outer subsystems are unobservable, but their existence is documented by the necessity of progressive replenishment of the observable populations, with limited survival times. There is persuasive evidence for two different evolutionary paths, one from the Oort cloud and another from the Kuiper belt. While the extent and accuracy of the data available is increasing rapidly, the Jupiter family of comets is the only one for which the evolutionary time scales do not exceed by many orders of magnitude the history of astronomical observations. The individual comet populations differ from one another not only by the distribution of orbits, but also by the size distribution and aging rate of their members. Their dynamical evolution is coupled with disintegration processes, which make it questionable whether the present state can be interpreted as a long-term average.

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Maximum non-gravitational acceleration due to out-gassing cometary nuclei

Cited by 11 publications

References 3 publications

Long-period comets with non-gravitational effects

Long-period comets with non-gravitational effects

The transparency of the Solar System to the Oort cloud comets

Comets (Existing Populations)

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