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Luminosity and Astrometry of Comets: A Review

Published online by Cambridge University Press:  22 February 2018

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By far the greatest number of observations of the brightness of comets, and the only ones that cover a long enough time span for investigation of secular effects, have been made by visual methods, mostly with small instruments. Such observations record the contribution of a large part of the coma, and possibly some light from the tail, at wavelengths to which the eye is sensitive. Three distinct observational techniques have been defined:

  1. 1) Comparison of similar-appearing extrafocal images of comet and comparison stars for equal apparent brightness. (Most observations have been made by this method.) The technique has been described by Bobrovnikoff (1941a, 1941b).

  2. 2) Comparison of the in-focus image of the comet with extrafocal images of comparison stars for equal apparent brightness. This method has been described by Sidgwick (1955).

  3. 3) A method used extensively by Max Beyer (1950), in which grossly out-of-focus images of the comet and comparison stars are examined for similarity of extinction against the sky.

Type
Part I
Copyright
Copyright © NASA 1976

References

Babcock, T. A., Sewell, M. H., Lewis, W. C. and James, T. H. (1974) Hypersensitization of Spectroscopic Films and Plates Using Hydrogen Gas. Astron. J. 79, 1479.CrossRefGoogle Scholar
Beyer, M. (1950) Physische Beobachtungen von Kometen. VII. Astr. Nach. 278, 217.CrossRefGoogle Scholar
Bobrovnikoff, N. T. (l941a) Investigations of the Brightness of Comets. I. Contr. Perkins Obs. No. 15.Google Scholar
Bobrovnikoff, N. T. (l941b) Observation of the Brightness of Comets. Popular Astronomy, 49, 467.Google Scholar
Bobrovnikoff, N. T. (l942) Investigations of the Brightness of Comets. II. Contr. Perkins Obs. No. 16.Google Scholar
Bobrovnikoff, N. T. (1943) On Systematic Errors in the Photometry of Comets. Contr. Perkins Obs. No. 19.Google Scholar
Delsemme, A. H. and Miller, D. C. (1971) Physico-Chemical Phenomena in Comets. III. The Continuum of Comet Burnham (1960 II). Planet. Space Sci. 19, 1229.CrossRefGoogle Scholar
Dixon, M. E. (1962, 1963) Astrometry with a Schmidt Camera. M. N. Astr. Soc. South Africa 21, 180186; 22, 6-10, 30-36.Google Scholar
Eastman Kodak Company (1973) Kodak Plates and Films for Scientific Photography P-315.Google Scholar
Eichhorn, H. and Gatewood, G. D. (1967) Tables Containing the Improved Plate Constants for the Northern Hyderabad Zone of the Astrographic Catalogue. Astron. Contrib. Univ. South Florida at Tampa, No. 3.Google Scholar
Eichhorn, H. (1974) Astronomy of Star Positions New York: Frederick Ungar Google Scholar
Günther, A. and Kox, H. (1970) Tables of Definitive Plate Constants for the Zones Greenwich, Rome-Vatican, Catania, Helsingfors of the Astrographic Catalogue. Astron. Astrophys. Suppl. Ser. 3, 85.Google Scholar
Günther, A. and Kox, H. (1972) Tables of Definitive Plate Constants for the Zones Potsdam, Hyderabad, Uccle, Oxford of the Astrographic Catalogue. Astron. Astrophys. Suppl. Ser. 6, 201.Google Scholar
Herget, P. (1973) Plate Constants of the Bordeaux Zone of the Astrographic Catalogue. Cincinnati Obs. Publ. No. 24.Google Scholar
König, A. (1962) Astrometry with Astrographs In: Hiltner, A., ed., Astronomical Techniques Chicago: Univ. Chicago Press, p. 461.Google Scholar
Livingston, W. C. (1973) Image-Tube Systems. Ann. Rev. Astron. Astrophys. 11, 95.CrossRefGoogle Scholar
Marsden, B. G. (1974) Comets. Ann. Rev, Astron. Astrophys. 12, 1.CrossRefGoogle Scholar
Meisel, D. D. and Morris, C. S. (1975) Comet Brightness Parameters: Definition, Determination, and Solar Modulation. (Paper 34, this Colloquium)Google Scholar
Morris, C. S. (1973) On Aperture Corrections for Comet Magnitude Estimates. Publ. Astron. Soc. Pacific 85, 470.CrossRefGoogle Scholar
Roemer, E. (1961) Astrometric Observations and Orbits of Comets. Astron. J. 66, 368.CrossRefGoogle Scholar
Roemer, E. (1963) Comets: Discovery, Orbits, Astrometric Observations. In: Middlehurst, B. M. and Kuiper, G. P., eds, The Moon, Meteorites, and Comets Chicago: Univ. Chicago Press, p. 527.Google Scholar
Roemer, E. (1966) The Dimensions of Cometary Nuclei. Mem. Soc. Roy. des Sci. de Liège 12, 23.Google Scholar
Roemer, E. (l97l) Astrometric Observations. In: Gehrels, T., ed., Physical Studies of Minor Planets NASA SP-267Google Scholar
Schmidt, M. (1951) The Variation of the Total Brightness of Comets with Heliocentric Distance. Bull. Astr. Inst. Netherlands 11, 253.Google Scholar
Scott, R. L. and Smith, A. G. (1974) Hypersensitization of Kodak Type 103a-0 Plates by Nitrogen Baking. Astron. J. 79, 656.CrossRefGoogle Scholar
Sekanina, Z. (1975) A Continuing Controversy: Has the Cometary Nucleus Been Resolved? (Paper 38, this Colloquium)CrossRefGoogle Scholar
Sidgwick, J. B. (1955) Observational Astronomy for Amateurs London: Faber and Faber. p. 251.Google Scholar
Smithsonian Astrophysical Observatory (1966) Star Catalog. Publ. Smithsonian Institution of Washington No. 4562. Washington: Smithsonian Institution.Google Scholar
Vsekhsvyatskij, S. K. (1958) Fizicheskie Kharakteristiki Komet Moscow: Nauka. (translation 1964 NASA TT F-80)Google Scholar