Hostname: page-component-78c5997874-v9fdk Total loading time: 0 Render date: 2024-11-05T03:23:33.994Z Has data issue: false hasContentIssue false

On Nongravitational Effects in two Classes of Models for Cometary Nuclei

Published online by Cambridge University Press:  14 August 2015

O. V. Dobrovol'skij
Affiliation:
Institute of Astrophysics, Dushanbe, U.S.S.R.
M. Z. Markovich
Affiliation:
Institute of Astrophysics, Dushanbe, U.S.S.R.

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Two types of cometary nuclei are considered: a homogeneous icy nucleus and an icy nucleus covered with a dispersive surface layer, 1 cm thick and having poor heat conductivity. The temperature of the evaporating ice surface of a nucleus rotating in a period of 6 hours about an axis perpendicular to the orbital plane was determined by numerical integration of the equation of heat conduction in the first case and of the Stefan problem in the second. For a nucleus of radius 105 cm and mass of 3.8 × 1015 g the reactive force was found to be about 107 dyn in either case, and the secular change in mean motion is of the order of the observed values. For the homogeneous nucleus the dependence of the reactive force on heliocentric distance is obtained.

Type
Part IV/Physical Processes in Comets
Copyright
Copyright © Reidel 1972 

References

Dubyago, A. D.: 1948, Astron. Zh. 20, 361.Google Scholar
Kajmakov, E. A. and Sharkov, V. I.: 1967, Komety i Meteory No. 15, 16.Google Scholar
Lejbenson, L. S.: 1934: Neftepromyslovaya Mekhanika , Gorgeolnefteizdat, Moscow, Groznyj, Leningrad and Novosibirsk, part 2.Google Scholar
Lejbenson, L. S.: 1947, Dvizhenie Prirodnykh Zidkostej i Gazov v Poristoj Srede , Gostekhizdat, Moscow-Leningrad.Google Scholar
Lykov, A. V.: 1952, Teoriya Teploprovodnosti , Gostekhizdat, Moscow.Google Scholar
Markovich, M. Z. and Tulenkova, L. N.: 1968, Probl. Kosmich. Fiz . No. 3, 25.Google Scholar
Marsden, B. G.: 1968, Astron. J. 73, 367.CrossRefGoogle Scholar
Reprintseva, S. M. and Fedorovich, N. V.: 1968, Luchistyj Teploobmen v Dispersnykh Sredakh , Nauka i Tekhnika, Minsk.Google Scholar
Richter, N. B.: 1963, The Nature of Comets , Methuen, London.Google Scholar
Sekanina, Z.: 1967, Bull. Astron. Inst. Czech. 18, 15.Google Scholar
Sekanina, Z.: 1968, Bull. Astron. Inst. Czech. 19, 210.Google Scholar
Sitarski, G.: 1964, Acta Astron. 14, 323.Google Scholar
Shumskij, P. A.: 1955, Osnovy Structurnogo Ledovedeniya , AN SSSR, Moscow.Google Scholar
Tikhonov, A. N. and Samarskij, A. A.: 1966, Uravneniya Matematicheskoj Fiziki , Nauka, Moscow.Google Scholar
Whipple, F. L.: 1950, Astrophys. J. 111, 375.Google Scholar
Whipple, F. L.: 1951, Astrophys. J. 113, 464.Google Scholar