Abstract
Post-perihelion observed emission fluxes at 388 nm (CN) and 516 nm (C2) of the coma of comets Austin (1982g) and Bradfield (1980t) are analysed in the framework of the Haser model. Ratios of Haser model CN and C2 parent production rates with expansion velocity show that each comet behaves normally. For comet Austin (1982g), the Q CN/v and Q c2/v values decrease with increase of heliocentric distance of comet. For an assumed %; activity of the total spherical surface area of the nucleus, the water vaporization theory coupled with derived water production rates from the International Ultraviolet Explorer H and OH flux data yields a nuclear diameter of about 6 km for comet Austin (1982g). For comet Bradfield (1980t), the derived nuclear diameter is expected to be of about 1 km. In each comet, the dust mass production rates as well as ratio of dust-to-gas mass production rates decrease with increase of heliocentric distance of comet.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Arvesen, J. C., Griffin Jr., R. N., and Douglas Pearson Jr., B.: 1969, Appl. Opt. 8, 2215.
Cochran, A.: 1982, Ph.D. Thesis, University of Texas at Austin, Texas.
Cochran, A.: 1987, Astron. J. 92, 231.
Cochran, A.: 1985, Astron. J. 90, 2609.
Cowan, J. J. and A'Hearn, M. F.: 1979, The Moon and Planets 21, 155.
Delsemme, A. H.: 1982, in Comets, L. L. Wilkening (ed.), The University of Arizona Press, Texas, p. 85.
Delamere, W. A., Huebner, W. F., Keller, H. U., Reitsema, H. J., Schmidt, H. U., Schmidt, W. K. H., Whipple, F. L., and Wilhelm, K.: 1986, 20th ESLAB Symp., ESA. SP-250, Vol. II, p. 355.
de Freitas Pacheco, J. A., Landaberry, S. J. C. and Singh, P. D.: 1988, Monthly Not. Roy. Astron. Soc. 235, 457.
Divine, N.: 1981, ESA-SP- 174, 47.
Feldman, P. D., A'Hearn, M. F., Schleicher, D. G., Festou, M. C., Wallis, M. K., Burton, W. M., Hughes, D. W., Keller, H. U., and Benvenuti, P.: 1984, Astron. Astrophys. 131, 394.
Goraya, P. S., Rautela, B. S., and Sanwal, B. B.: 1984, Earth, Moon, and Planets 30, 63.
Goraya, P. S., Sinha, B. K., Chaubey, U. S., and Sanwal, B. B.: 1982, The Moon and Planets 26, 3.
Hanner, M.: 1983, in Cometary Exploration, T. I. Gambosi (ed.), II, CRIP, Budapest, p. 1.
Haser, L.: 1957, Bull. Acad. Roy. Soc. Belgique 43, 740.
Landaberry, S. J. C., Singh, P. D., and de Freitas Pacheco, J. A.: 1990, Astron. Astrophys. (comm.).
Ney, E. P. and Merrill, K. M.: 1976, Science 194, 1051.
Ney, E. P.: 1982, in Comets, L. L. Wilkening (ed.), The University of Arizona Press, Tucson. p. 323.
Newburn, Jr., R. L. and Spinrad, H.: 1984, Astron. J. 89, 289.
Newburn, Jr., R. L. and Spinrad, H.: 1985, Astron. J. 90, 2591.
Newburn, Jr., R. L. and Spinrad, H.: 1989, Astron. J. 97, 552.
Newburn, Jr. R. L.: 1981, ESA-SP-174, 3.
Oliverson, R. J., Hollis, J. M., and Brown, L. W.: 1985, Icarus 63, 339.
O'Dell, C. R. O. and Osterbrock, D. E.: 1962, Astrophys. J. 136, 559.
Probstein, R. F.: 1969, in Problems of Hydrodynamics and Continuum Mechanics, SIAM, Philadelphia, p. 568.
Sekanina, Z.: 1981, Astron. J. 86, 1741.
Spinrad, H.: 1987, Ann. Rev. Astron. Astrophys. 25, 231.
Tatum, J. B.: 1984, Astron. Astrophys. 135, 183.
Tatum, J. B. and Gillespie, M. I.: 1977, Astrophys. J. 218, 569.
Weaver, H. A., Feldman, P. D., Festou, M. C., and A'Hearn, M. F.: 1981, Astrophys. J. 251, 809.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Singh, P.D., Sinha, K., Tripathi, B.M. et al. An analysis of spectrophotometric observations of comets Austin (1982g) and Bradfield (1980t). Earth Moon Planet 47, 231–239 (1989). https://doi.org/10.1007/BF00114102
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00114102