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Cometary Photometry

Published online by Cambridge University Press:  12 April 2016

D. Jewitt*
Affiliation:
Institute for Astronomy , University of Hawaii 2680Woodlawn Drive Honolulu HI 96822

Abstract

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The study of comets using modern optical photometric techniques is reviewed. Particular emphasis is given to the physical constraints imposed on the nature of comets by photometric data. The photometric study of bare nuclei and of active comets is discussed.

Type
Section I: Observing Techniques and Interpretation
Copyright
Copyright © Kluwer 1991

References

A’Hearn, M.F. (1982). ‘Spectrophotometry of Comets at Optical Wavelengths,’ in Comets, edited by Wilkening, L.L., University of Arizona Press, Tucson, pp. 433460.Google Scholar
A’Hearn, M.F. (1983). ‘Photometry of Comets,’ in Solar System Photometry Handbook. edited by Genet, R., Willmann-Bell, Richmond, Virginia, P. 31.Google Scholar
A’Hearn, M.F., Millis, R.L., and Birch, P.V. (1981). ‘Comet Bradfield 1979X: The Gassiest Comet?’, Astron. J., 86, 15591566.Google Scholar
A’Hearn, M.F., Schleicher, D.G., Feldman, P.D., Millis, R.L., and Thompson, D.T. (1984). ‘Comet Bowell 1980b,’ Astron. J., 89, 579591.Google Scholar
A’Hearn, M.F., Hoban, S., Birch, P.V., Bowers, C., Martin, R., and Klinglesmith, D.A. (1986a). ‘CN Jets in Comet P/Halley,’ Nature, 324, 649651.Google Scholar
A’Hearn, M.F., Hoban, S., Birch, P.V., Bowers, C., Martin, R., and Klinglesmith, D.A. (1986b). ‘Gaseous Jets in Comet P/Halley,’ in 20th ESLAB Symposium. ESA SP-250, Heidelberg, pp. 483486.Google Scholar
A’Hearn, M.F., Campins, H., Schleicher, D.G., and Millis, R.L. (1989). ‘The Nucleus of P/Tempel 2,’ Astrophys. J., 347, 11551166.Google Scholar
Altenhoff, W.J., Huchtmeier, W.K., Schmidt, J., Schraml, J.B., Stumpff, P., and Thum, C. (1986). ‘Radio Continuum Observations of Comet Halley,’ Astron. Astrophys., 164, 227230.Google Scholar
Baum, W.A., and Kreidl, T.J. (1986). ‘Volatiles in Cometary Grains,’ in Asteroids. Comets. Meteors II. edited by Lagerkvist, C.-I., Lindblad, B.A., Lundstedt, H., and Rickman, H., Uppsala University Press, Uppsala, pp. 397402.Google Scholar
Baum, W.A., Thomsen, B., and Kreidl, T.J. (1981). ‘Subtleties in the Flat-Fielding of CCD Images,’ in Solid State Imagers for Astronomy. Proc. Int. Soc. Opt. Eng., 290, 2427.Google Scholar
Belton, M.J.S. (1990). ‘Rationalization of Halley’s Periods: Evidence for an Inhomogeneous Nucleus?’, Icarus, in press.Google Scholar
Boehnhardt, H., and Fechtig, H. (1987). ‘Electrostatic Charging and Fragmentation of Dust Near P/Giacobini-Zinner and P/Halley,’ Astron. Astrophys., 187, 824828.Google Scholar
Bowell, E., Hapke, B., Domingue, D., Lumme, K., Peltoniemi, J., and Harris, A.W. (1989). ‘Application of Photometric Models to Asteroids,’ in Asteroids II. edited by Binzel, R.P., Gehrels, T., and Matthews, M.S., University of Arizona Press, Tucson, pp. 524556.Google Scholar
Burns, J.A., Lamy, P.L., and Soter, S. (1979). ‘Radiation Forces in the Solar System,’ Icarus, 40, 148.Google Scholar
Campins, H., A’Hearn, M.F., and McFadden, L. (1987). ‘The Bare Nucleus of Comet P/Neujmin 1,’ Astrophys. J., 316, 847857.Google Scholar
Cochran, A. (1985). ‘A Re-Evaluation of the Haser Model Scale Lengths for Comets,’ Astron. J., 90, 26092614.Google Scholar
Combi, M.R. (1987). ‘Sources of Cometary Radicals and Their Jets: Gases or Grains?’, Icarus, 71, 178191.Google Scholar
Combi, M.R., and Smyth, W.H. (1988). ‘Monte Carlo Particle-Trajectory Models for Neutral Cometary Gases. I. Models and Equations,’ Astrophys. J., 327, 10261043.Google Scholar
Delsemme, A.H. (1976). ‘The Neutral Coma of Comets: A Review,’ in The Study of Comets, edited by Donn, B., Mumma, M., Jackson, W., A’Hearn, M., and Harrington, R., NASA SP-393, U.S. Government Printing Office, Washington, D.C., pp. 711737.Google Scholar
Delsemme, A.H. (1982). ‘Chemical Composition of Cometary Nuclei,’ in Comets, edited by Wilkening, L.L., University of Arizona Press, Tucson, pp. 85130.Google Scholar
Delsemme, A.H. (1985). ‘The Sublimation Temperature of the Cometary Nucleus,’ in Ices in the Solar System, edited by Klinger, J., Benest, D., Dollfus, A., and Smoluchowski, R., NATO Advanced Science Institutes Series, C. 156, D. Reidel Pub. Co., Dordrecht, p. 367.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, 12291257.Google Scholar
Dermott, S.F., Harris, A.W., and Murray, C.D. (1984). ‘Asteroid Rotation Rates,’ Icarus, 57, 1434.Google Scholar
Dollfus, A., and Suchail, J.-L. (1987). ‘Polarimetry of Grains in the Coma of Comet P/Halley. I. Observations,’ Astron. Astrophys., 187, 669688.Google Scholar
Eddington, A.S. (1910). ‘The Envelopes of Comet Morehouse (1908c),’ M. N. R. A. S., 70, 442458.Google Scholar
Fanale, F.p., and Salvati, J.R. (1984). ‘An Idealized Short-Period Comet Model: Surface Insolation, H2O Flux, Dust Flux, and Mantle Evolution,’ Icarus, 60, 476511.Google Scholar
Fay, T.D., and Wisniewski, W. (1978). ‘The Lightcurve of the Nucleus of Comet d’Arrest,’ Icarus, 34, 19.Google Scholar
Feldman, P.D., A’Hearn, M.F., and Millis, R.L. (1984). ‘Temporal and Spatial Behavior of the Ultraviolet Emissions of Comet IRAS-Araki-Alcock 1983d,’ Astrophys. J., 282, 799802.Google Scholar
Festou, M.C. (1981). ‘The Density Distribution of Neutral Compounds in Cometary Atmospheres. I. Models and Equations,’ Astron. Astrophys., 95, 6979.Google Scholar
Festou, M.C, and Feldman, P.D. (1981). ‘The Forbidden Oxygen Lines in Comets,’ Astron. Astrophys., 103, 154159.Google Scholar
Finson, M.L., and Probstein, R.F. (1968). ‘A Theory of Dust Comets. I. Model and Equations,’ Astrophys. J., 154, 327352.Google Scholar
Fort, B. (1985). ‘New Trends in CCD Photometry of Galaxies,’ in New Aspects of Galaxy Photometry, edited by Araki, H., Springer-Verlag, Berlin, pp. 312.Google Scholar
Fulle, M. (1989). ‘Evaluation of Cometary Dust Parameters From Numerical Simulations: Comparison With Analytical Approach and Role of Anisotropie Emissions,’ Astron. Astrophys., 217, 283297.Google Scholar
Gammelgaard, P., and Thomsen, B. (1988). ‘C2, H2O+, and Dust Distribution in Comet P/Halley Near Opposition,’ Astron. Astrophys., 197, 320326.Google Scholar
Goldstein, R.M., Jürgens, R.F., and Sekanina, Z. (1984). ‘A Radar Study of Comet 1983d,’ Astron. J., 89, 17451754.Google Scholar
Gombosi, T.I. (1986). ‘A Heuristic Model of the Comet Halley Dust Size Distribution,’ in 20th ESLAB Symposium. ESA SP-250, Heidelberg, pp. 167171.Google Scholar
Gunn, J., and Westphal, J.A. (1981). ‘Care, Feeding, and Use of Charge-Coupled Device (CCD) Imagers at Palomar Observatory,’ in Solid State Imagers for Astronomy. Proc. Int. Soc. Opt. Eng., 290, 1623.Google Scholar
Hanner, M.S. (1981). ‘On the Detectability of Icy Grains in the Comae of Comets,’ Icarus, 47, 342350.Google Scholar
Hanner, M.S., and Newburn, R. (1989). ‘Infrared Photometry of Comet Wilson (1986I) at Two Epochs,’ Astron. J., 97, 254261.Google Scholar
Hartmann, W.K., and Cruikshank, D. (1984). ‘Comet Color Changes With Solar Distance,’ Icarus, 57, 5562.Google Scholar
Haser, L. (1957). ‘Distribution D’Intensitie Dans la Tete d’une Comete,’ Bull. Acad. Roy. Sci. Liege, 43, 740 Google Scholar
Haser, L. (1966). ‘Calcul de Distribution D’Intensitie Relative Dans une Tete Cometaire,’ Mem. Soc. Roy. Sci. Liege, XII, 233242.Google Scholar
Hellmich, R., and Keller, H.U. (1981). ‘On the Visibility of Nuclei of Dusty Comets,’ Icarus, 47, 325332.Google Scholar
Hoban, S. Samarasinha, N.H., A’Hearn, M.F., and Klinglesmith, D.A. (1988). ‘An Investigation Into Periodicities of CN Jets in Comet P/Halley,’ Astron. Astrophys., 195, 331337.Google Scholar
Hoban, S., A’Hearn, M.F., Birch, P.V., and Martin, R. (1989). ‘Spatial Structure in the Color of the Dust Coma of Comet P/Halley,’ Icarus, 79, 145158.Google Scholar
Isserstedt, J., and Schlosser, W. (1975). ‘Intensity Fluctuations in the Head of Comet 1973f,’ Astron. Astrophys., 41, 913.Google Scholar
Jewitt, D.C. (1990). ‘The Persistent Coma of Comet P/Schwassmann-Wachmann 1,’ Astrophys. J., in press.Google Scholar
Jewitt, D.C., and Danielson, G.E. (1984). ‘Charge Coupled Device Photometry of Comet P/Halley,’ Icarus, 60, 435444.Google Scholar
Jewitt, D.C., and Luu, J.X. (1989). ‘A CCD Portrait of Comet P/Tempel 2,’ Astron. J., 97, 17661790.Google Scholar
Jewitt, D.C., and Meech, K.J. (1985). ‘Rotation of the Nucleus of P/Arend-Rigaux,’ Icarus, 64, 329335.Google Scholar
Jewitt, D.C., and Meech, K.J. (1986). ‘Cometary Grain Scattering Versus Wavelength, or, “What Color Is Comet Dust?”,’ Astrophys. J., 310, 937952.Google Scholar
Jewitt, D.C., and Meech, K.J. (1987a). ‘Surface Brightness Profiles of 10 Comets,’ Astrophys. J., 317, 9921001.Google Scholar
Jewitt, D.C., and Meech, K.J. (1987b). ‘CCD Photometry of Comet P/Encke,’ Astron. J., 93, 15421548.Google Scholar
Jewitt, D.C., and Meech, K.J. (1988a). ‘The Absence of a Color-Distance Trend in Comets,’ Astron. J., 96, 17231730.Google Scholar
Jewitt, D.C., and Meech, K.J. (1988b). ‘Optical Properties of Cometary Nuclei and a Preliminary Comparison With Asteroids,’ Astrophys. J., 328, 974986.Google Scholar
Keller, H.U., et al. (1987). ‘Comet Halley’s Nucleus and Its Activity,’ Astron. Astrophys., 187, 807823.Google Scholar
Kiselev, N.N., and Chernova, G.p. (1981). ‘Phase Functions of Polarization and Brightness and the Nature of Cometary Atmosphere Particles,’ Icarus, 48, 473481.Google Scholar
Lamy, P.L. (1986). ‘Cometary Dust: Observational Evidences and Properties,’ in Asteroids. Comets. Meteors II. edited by Lagerkvist, C.-I., Lindblad, B.A., Lundstedt, H., and Rickman, H., Uppsala University Press, Uppsala, pp. 373388.Google Scholar
Lamy, P.L. (1989). Presentation at “Comets in the Post-Halley Era,” Bamberg.Google Scholar
P.L., Lamy, and J.-M., Perrin (1988). ‘Optical Properties of Organic Grains: Implications for Interplanetary and Cometary Dust,’ Icarus, 76, 100109.Google Scholar
Lamy, P.L., Pederson, H., and Vio, R. (1987). ‘The Dust Tail of Comet P/Halley in April 1986,’ Astron. Astrophys., 187, 661664.Google Scholar
Lamy, P.L., Malburet, P., Llebaria, A., and Koutchmy, S. (1989). ‘Comet P/Halley at a Heliocentric Preperihelion Distance of 2.6 AU: Jet Activity and Properties of the Coma,’ Astron. Astrophys., 222, 316322.Google Scholar
Larson, S.M. (1986). ‘A Review of Some Digital Image Processing in Cometary Research,’ in Asteroids. Comets. Meteors II, edited by Lagerkvist, C.-I., Lindblad, B.A., Lundstedt, H., and Rickman, H., Uppsala University Press, Uppsala, pp. 449459.Google Scholar
Larson, S.M., and A’Hearn, M.F. (1984). ‘Comet Bowell (1980b): Measurement of the Optical Thickness of the Coma and Particle Albedo From Stellar Occultation,’ Icarus, 58, 446450.Google Scholar
Larson, S.M., and Sekanina, Z. (1984). ‘Coma Morphology and Dust Emission Pattern of P/Halley. I. High Resolution Images Taken at Mount Wilson in 1910,’ Astron. J., 89, 571578.Google Scholar
Larson, S.M., Sekanina, Z., Levy, D., Tapia, S., and Senay, M. (1987). ‘Comet P/Halley Near-Nucleus Phenomena in 1986,’ Astron. Astrophys., 187, 639644.Google Scholar
Luppino, G.A. (1989). ‘A Virtual Phase CCD Camera for MDM Observatory,’ P. A. S.P., 101, 931939.Google Scholar
Lutz, B.L., and Wagner, R.M. (1986). ‘Temporal Variability of Comet IRAS-ARAKI-ALCOCK 1983d: The May 10 Event,’ Astrophys. J., 308, 9931000.Google Scholar
Luu, J.X. (1988). ‘The Scale Lengths of Molecules in P/Halley,’ unpublished manuscript.Google Scholar
Luu, J.X., and Jewitt, D.C. (1990). ‘The Nucleus of Comet P/Encke,’ Icarus, in press.Google Scholar
Massonne, L., Fertig, J., Grün, E., and Schwehm, G. (1986). ‘A Cometary Dust Environment Model for the Generation of Synthetic Images,’ in Asteroids. Comets. Meteors II. edited by Lagerkvist, C.-I., Lindblad, B.A., Lundstedt, H., and Rickman, H., Uppsala University Press, Uppsala, pp. 407410.Google Scholar
McDonnell, J.A.M., Pankiewicz, G.S., Birchley, P.N.W., Green, S.F., and Perry, C.H. (1989). ‘The Comet Nucleus: Ice and Dust Morphological Balances in a Production Surface of Comet P/Halley,’ submitted to Proc. XXth L. P. S. C. Google Scholar
McFadden, L.A., A’Hearn, M.F., Feldman, P.D., Roettger, E.E., Edsall, D.M., and Butterworth, P.S. (1987). ‘Activity of Comet P/Halley 23-25 March, 1986: IUE Observations,’ Astron. Astrophys., 187, 333338.Google Scholar
Meech, K.J., and Jewitt, D.C. (1987). ‘Observations of Comet P/Halley at Minimum Phase Angle,’ Astron. Astrophys., 187, 585593.Google Scholar
Meech, K.J., Jewitt, D.C, and Ricker, G. (1986). ‘Early Photometry of Comet P/Halley: Development of the Coma,’ Icarus, 66, 561574.Google Scholar
Meisel, D.D., and Morris, C.S. (1982). ‘Comet Head Photometry: Past, Present and Future,’ in Comets, edited by Wilkening, L.L., University of Arizona Press, Tucson, pp. 413432.Google Scholar
Mendis, D.A., and Ip, W.-H. (1976). ‘The Neutral Atmospheres of Comets,’ Astrophys. Space Sci., 39, 335385.Google Scholar
Meredith, N.p., Wallis, M.K., and Rees, D. (1989). ‘The Anomalous Behavior of C2 in P/Borrelly 1987p,’ M. N. R. A. S., 240, 647655.Google Scholar
Millis, R.L., and Schleicher, D.G. (1986). ‘Rotational Period of Comet Halley,’ Nature, 324, 646649.Google Scholar
Millis, R.L., A’Hearn, M.F., and Thompson, D.T. (1982). ‘Narrowband Photometry of Comet P/Stephan-Oterma and the Backscattering Properties of Cometary Grains,’ Astron. J., 87, 13101317.Google Scholar
Millis, R.L., A’Hearn, M.F., and Campins, H. (1988). ‘An Investigation of the Nucleus and Coma of Comet P/Arend-Rigaux,’ Astrophys. J., 324, 11941209.Google Scholar
Mukai, T., Mukai, S., Fechtig, H., Grun, E., and Giese, R.H. (1985). ‘Dirty Ice Grains in Comets,’ Adv. Space Res., 5, 339342.Google Scholar
Neckel, T., and Munch, G. (1987). ‘Photometry of Comet Halley at Near Post-Perihelion Phases,’ Astron. Astrophys., 187, 581584.Google Scholar
Newbum, R., and Spinrad, H. (1985). ‘Spectrophotometry of Seventeen Comets II. The Continuum,’ Astron. J., 90, 25912608.Google Scholar
Newburn, R., and Spinrad, H. (1989). ‘Spectrophotometry of 25 Comets,’ Astron. J., 97, 552569.Google Scholar
Ney, E.p. (1982). ‘Visibility of Comet Nuclei,’ Science, 215, 397398.Google Scholar
Ney, E.p., and Merrill, K. (1976). ‘Comet West and the Phase Function of Cometary Dust,’ Science, 194, 10511053.Google Scholar
Notni, P., and Tiersch, H. (1987). ‘Charging of Dust Particles in Comets and in Interplanetary Space,’ Astron. Astrophys., 187, 796800.Google Scholar
O’Dell, C.R. (1971). ‘Nature of Paniculate Matter in Comets as Determined From Infrared Observations,’ Astrophys. J., 166, 675681.Google Scholar
O’Dell, C.R., Robinson, R.R., Krishna Swamy, K.S., McCarthy, P.J., and Spinrad, H. (1988). C2 in Comet Halley: Evidence for Its Being Third Generation and Resolution of the Vibrational Population Discrepancy,’ Astrophys. J., 334, 476488.CrossRefGoogle Scholar
Öpik, E.J. (1963). ‘Photometry, Dimensions and Ablation Rate of Comets,’ Irish Astr. J., 6, 93112.Google Scholar
Öpik, E.J. (1975). ‘On Predicting the Brightness of Comets,’ in Comet Kohoutek, edited by Gary, G.A., NASA SP-355, Washington, D.C., pp. 205207.Google Scholar
Padgham, C.A., and Saunders, J.E. (1975). The Perception of Light and Colour. Bell, G. and Sons, London.Google Scholar
Rees, D., Meredith, N.P., and Wallis, M.K. (1986). ‘Optical Observations of the Neutral and Ion Coma of Comet Halley,’ in 20th ESLAB Symposium. ESA SP-250, Heidelberg, pp. 493498.Google Scholar
Rettig, T.W., Kern, J.R., Ruchti, R., Baumbaugh, B., Baumbaugh, A.E., Knickerbocker, A.E., and Dawe, J. (1987). ‘Observations of the Coma of Comet P/Halley and the Outburst of 1986 March 24-25 (UT),’ Astron. Astrophys., 187, 249255.Google Scholar
Roemer, E. (1966a). ‘Cometary Nuclei—Introductory Report,’ Mem. Soc. Roy. Sci. Liege, XII, 1522.Google Scholar
Roemer, E. (1966b). ‘The Dimensions of Cometary Nuclei,’ Mem. Soc. Roy. Sci. Liege, XII, 2328.Google Scholar
Roemer, E. (1976). ‘Luminosity and Astrometry of Comets: A Review,’ in The Study of Comets, edited by Donn, B., Mumma, M., Jackson, W., A’Hearn, M., and Harrington, R., NASA SP-393, U.S. Government Printing Office, Washington, D.C., pp. 380409.Google Scholar
Russell, H.N. (1916). ‘On the Albedo of the Planets and Their Satellites,’ Astrophys. J., 43, 173195.Google Scholar
Salo, H. (1988). ‘Monte Carlo Modelling of the Net Effects of Coma Scattering and Thermal Reradiation on the Energy Input to the Cometary Nucleus,’ Icarus, 76, 253269.Google Scholar
Schleicher, D.G., Millis, R.L., and Birch, P.V. (1987). ‘Photometric Observations of Comet P/Giacobini-Zinner,’ Astron. Astrophys., 187, 531538.Google Scholar
Sekanina, Z. (1976). ‘A Continuing Controversy: Has the Cometary Nucleus Been Resolved?’, in The Study of Comets, edited by Donn, B., Mumma, M., Jackson, W., A’Hearn, M., and Harrington, R., NASA SP-393, U.S. Government Printing Office, Washington, D.C., pp. 537587.Google Scholar
Sekanina, Z. (1987). ‘Anisotropie Emission From Comets: Fans Versus Jets I. Concept and Modeling,’ in Symposium on the Diversity and Similarity of Comets. ESA SP-278, Brussels, Belgium.Google Scholar
Sekanina, Z., and Farrell, J.A. (1982). ‘Two Dust Populations of Particle Fragments in the Striated Tail of Comet Mrkos 1957 V,’ Astron. J., 87, 18361853.Google Scholar
Simpson, J.A., Rabinowitz, D., Tuzzolino, A.J., Ksanfomality, L.V., and Sagdeev, R.Z. (1987). ‘The Dust Coma of Comet P/Halley: Measurements on the Vega-1 and Vega-2 Spacecraft,’ Astron. Astrophys., 187, 742752.Google Scholar
Smoluchowski, R. (1985). ‘Amorphous and Porous Ices in Cometary Nuclei,’ in Ices in the Solar System, edited by Klinger, J., Benest, D., Dollfus, A., and Smoluchowski, R., NATO Advanced Science Institutes Series, C. 156, D. Reidel Pub.Co., Dordrecht, pp. 397406.Google Scholar
Thomas, N., and Keller, H.U. (1989). ‘The Colour of Comet P/Halley’s Nucleus and Dust,’ Astron. Astrophys., 213, 487494.Google Scholar
Van de Hulst, H.C. (1957). Light Scattering by Small Particles, Wiley, New York.Google Scholar
Vaisberg, O.L., Smirnov, V., Omelchenko, A., Gorn, L., and Iovlev, M. (1987). ‘Spatial and Mass Distribution of Low-Mass Dust Particles (m < 1O−10 kg) in Comet P/Halley’s Coma,’ Astron. Astrophys., 187, 753760.Google Scholar
Wallace, L.V., and Miller, F.D. (1958). ‘Isophote Configurations for Model Comets,’ Astron. J., 63, 213219.Google Scholar
Wallis, M.K., Rabilizirov, R., and Wickramasinghe, N.C. (1987). ‘Evaporating Grains in P/Halley’s Coma,’ Astron. Astrophys., 187, 801806.Google Scholar
Weissman, P.R. (1988). ‘Why Was Halley’s Comet So Bright?’, B. A. A. S., 20, 825 Google Scholar
Weissman, P.R., and Kieffer, H.H. (1981). ‘Thermal Modelling of Cometary Nuclei,’ Icarus, 47, 302311.Google Scholar
West, R.N., and Jorgenson, H.E. (1989). ‘Post-Perihelion Observations of Comet P/Halley at R = 8.5 AU,’ Astron. Astrophys., 218, 307316.Google Scholar
West, R.N., Pedersen, H., Monderen, P., Vio, R., and Grosbol, P. (1986). ‘Post-Perihelion Imaging of Comet Halley at ESO,’ Nature, 321, 363365.Google Scholar
Whipple, F.L. (1978). ‘Cometary Brightness Variation and Nucleus Structure,’ Moon and Planets, 18, 343359.Google Scholar
Whipple, F.L. (1980). ‘Rotation and Outbursts of Comet P/SW1,’ Astron. J., 85, 305313.Google Scholar
Whipple, F.L. (1982). ‘The Rotation of Comets,’ in Comets, edited by Wilkening, L.L., University of Arizona Press, Tucson, pp. 227250.Google Scholar
Whipple, F.L. (1989). ‘Comets in the Space Age,’ Astrophys. J., 341, 115.Google Scholar
Whipple, F.L., and Sekanina, Z. (1979). ‘Comet Encke: Precession of the Spin Axis, Non-Gravitational Motion, and Sublimation,’ Astron. J., 84, 18941909.Google Scholar
Wilhelm, K. (1986). ‘Rotation and Precession of Comet Halley,’ Nature, 327, 2730.Google Scholar
Wyckoff, S., Wagner, R.M., Wehinger, P.A., Schleicher, D.G., and Festou, M.C. (1985). ‘Onset of Sublimation in Comet P/Halley (1982i),’ Nature, 316, 241242.Google Scholar