Comets and Nongravitational Forces. IV

1971 ◽  
Vol 76 ◽  
pp. 1135 ◽  
Author(s):  
B. G. Marsden ◽  
Z. Sekanina
Keyword(s):  
Nongravitational Forces

scholarly journals 8. Comet Halley and Nongravitational Forces

1977 ◽  
Vol 39 ◽  
pp. 61-64
Author(s):  
D. K. Yeomans
Keyword(s):  
Force Model ◽  
Water Ice ◽  
Comet Halley ◽  
Nongravitational Effects ◽  
Nongravitational Forces

The motion of Comet Halley is investigated over the 1607-1911 interval. The required nongravitational force model was found to be most consistent with a rocket-type thrust from the vaporization of water-ice in the comet’s nucleus. The nongravitational effects are time-independent over the investigated interval.

Validation of Swarm accelerometer data by modelled nongravitational forces

2017 ◽  
Vol 59 (10) ◽  
pp. 2512-2521 ◽  
Author(s):  
Aleš Bezděk ◽  
Josef Sebera ◽  
Jaroslav Klokočník
Keyword(s):  
Accelerometer Data ◽  
Nongravitational Forces

Comets and Nongravitational Forces. II

1969 ◽  
Vol 74 ◽  
pp. 720 ◽  
Author(s):  
B. G. Marsden
Keyword(s):  
Nongravitational Forces

scholarly journals Nongravitational Effects on Comets: the Current Status

1972 ◽  
Vol 45 ◽  
pp. 135-143
Author(s):  
B. G. Marsden
Keyword(s):  
Heliocentric Distance ◽  
Equations Of Motion ◽  
Current Status ◽  
Future Research ◽  
Secular Changes ◽  
Nongravitational Effects ◽  
Nongravitational Forces

A method for allowing for the effects of nongravitational forces on the motions of comets is summarized. Study of the motions of specific comets indicates that these forces act essentially continuously but have a high inverse dependence on heliocentric distance; there is also evidence for secular changes. The equations of motion employed are discussed in terms of the Whipple icyconglomerate model. Nongravitational parameters are tabulated for all 46 comets observed at three or more perihelion passages. We point out the particular problems that still exist for certain comets and suggest directions for future research.

scholarly journals Splitting of Periodic Comets

1992 ◽  
Vol 152 ◽  
pp. 281-285
Author(s):  
Giuseppe Forti
Keyword(s):  
Relative Motion ◽  
Dynamic Study ◽  
Inverse Square Law ◽  
Secondary Nucleus ◽  
Break Up ◽  
Periodic Comet ◽  
Nongravitational Forces

Among the comets that were observed to break in two or more fragments, only a few of them are periodic. So far the dynamic study of the relative motion of a secondary nucleus with respect to the primary has supposed that a cometary fragment is subject to a small and continuous radial nongravitational force after separation at rest. This force acts against the solar attraction and varies according to an inverse square law. A small impulse at break up may also be invoked in some case. A different approach is followed in this paper when dealing with a fragment of a periodic comet: after separation the motion of a secondary nucleus is characterized by nongravitational forces which vary according to the same g(r) law currently used for the primary.Results of the study of comets P/Biela and P/du Toit-Hartley show that the motion of their fragments after separation is characterized by nongravitational parameters which are larger than those of the parent bodies. Both fragments lasted for about 2 full revolutions and three returns.

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