Earth, Moon, and Planets

, Volume 89, Issue 1–4, pp 3–25 | Cite as

The Nucleus of Comet Hale-Bopp (C/1995 O1): Size and Activity

  • Yanga R. Fernández


A review of our current understanding of Comet Hale-Bopp’s nuclear size is presented. Currently the best constraints on the effective radiusare derived from late-1996 mid-IR data and near-perihelion radio data.Unfortunately the two regimes give differing answers for the radius. A possible reconciliation of the two datasets is presented that would place the radius at around 30 km. This is a large cometary radius compared to the others that are known, and this motivates a discussion of what makes a large comet different. From several possible large-comet properties, Hale-Bopp’s activity is analyzed, focusing on the production rates, coma jet features, dust optical depth, and relationship with the interplanetary dust environment. The optical depth is particularly important since an optically-thick inner coma could complicate attempted measurements of the “nucleus”.

Comets Hale-Bopp 


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  1. A’Hearn, M. F., Campins, H., Schleicher, D. G., and Millis, R. L.: 1989, ‘The Nucleus of Comet P/Tempel 2’, Ap. J. 347, 1155-1166.CrossRefADSGoogle Scholar
  2. A’Hearn, M. F., Millis, R. L., Schleicher, D. G., Osip, D. J., and Birch, P. V.: 1995, ‘The Ensemble Properties of Comets: Results from Narrowband Photometry of 85 Comets: 1976-1992’, Icarus 118, 223-270.CrossRefADSGoogle Scholar
  3. Allen, D. A.: 1970, ‘Infrared Diameter of Vesta’, Nature 227, 158-159.CrossRefADSGoogle Scholar
  4. Altenhoff, W. J., Bieging, J. H., Butler, B., Butner, H. M., Chini, R., Haslam, C. G. T., Kreysa, E., Martin, R. N., Mauersberger, R., McMullin, J., Muders, D., Peters, W. L., Schmidt, J., Schraml, J. B., Sievers, A., Stumpff, P., Thum, C., von Kap-Herr, A., Wiesemeyer, H., Wink, J. E., and Zylka, R.: 1999, ‘Coordinated Radio Continuum Observations of Comets Hyakutake and Hale-Bopp from 22 to 860 GHz’, A. & A. 348, 1020-1034.ADSGoogle Scholar
  5. Boehnhardt, H., Birkle, K., Fiedler, A., Jorda, L., Peschke, S., Rauer, H., Schulz, R., Schwehm, G., Thomas, N., Tozzi, G., and West, R.: 1997, ‘Dust Morphology of Comet Hale-Bopp (C/1995 O1): I. Pre-Perihelion Coma Structures in 1996’, Earth Moon Planets 78, 179-187.CrossRefADSGoogle Scholar
  6. Brown, W. R., and Luu, J. X.: 1998, ‘Properties of Model Comae around Kuiper Belt and Centaur Objects’, Icarus 135, 415-430.CrossRefADSGoogle Scholar
  7. Campins, H., A'Hearn, M. F., and McFadden, L. A.: 1987, ‘The Bare Nucleus of Comet Neujmin 1’, Ap. J. 316, 847-857.CrossRefADSGoogle Scholar
  8. Campins, H. and Fernández, Y.: 2002, ‘Observational Constraints on Surface Characteristics of Comet Nuclei’, these proceedings.Google Scholar
  9. Campins, H., Osip, D. J., Rieke, G. H., and Rieke, M. J.: 1995, ‘Estimates of the Radius and Albedo of Comet-Asteroid Transition Object 4015 Wilson-Harrington Based on Infrared Observations’, Planet. Space Sci. 43, 733-736.CrossRefADSGoogle Scholar
  10. Campins, H., Telesco, C. M., Osip, D. J., Rieke, G. H., Rieke, M. J., and Schulz, B.: 1994, ‘The Color Temperature of (2060) Chiron: A Warm and Small Nucleus’, A.J. 108, 2318-2322.CrossRefADSGoogle Scholar
  11. Cowan, J. J., and A'Hearn, M. F.: 1979, ‘Vaporization of Comet Nuclei-Light Curves and Life Times’, Moon Planets 21, 155-171.CrossRefADSGoogle Scholar
  12. Crovisier, J., Leech, K., Bockelée-Morvan, D., Brooke, T. Y., Hanner, M. S., Altieri, B., Keller, H. U., and Lellouch, E.: 1997, ‘The Spectrum of Comet Hale-Bopp (C/1995 01) Observed with the Infrared Space Observatory at 2.9 AU from the Sun’, Science 275, 1904-1907.CrossRefADSGoogle Scholar
  13. de Pater, I., Forster, J. R., Wright, M., Butler, B. J., Palmer, P., Veal, J. M., A'Hearn, M. F., and Snyder, L. E.: 1998, ‘BIMA and VLA Observations of Comet Hale-Bopp at 22-115 GHz’, A.J. 116, 987-996.CrossRefADSGoogle Scholar
  14. de Pater, I., Wade, C. M., Houpis, H. L. F., and Palmer, P.: 1983, ‘The Nondetection of Continuum Radiation from Comet IRAS-Araki-Alcock (1983d) at 2-to 6-cm Wavelengths and its Implication on the Icy-Grain Halo Theory’, Icarus 62, 349-359.CrossRefADSGoogle Scholar
  15. Dello Russo, N., Mumma, M. J., DiSanti, M. A., Magee-Sauer, K., Novak, R., and Rettig, T. W.: 2000, ‘Water Production and Release in Comet C/1995 O1 Hale-Bopp’, Icarus 143, 324-337.CrossRefADSGoogle Scholar
  16. DiSanti, M. A., Mumma, M. J., Dello Russo, N., Magee-Sauer, K., Novak, R., and Rettig, T. W.: 1999, ‘Identification of Two Sources of Carbon Monoxide in Comet Hale-Bopp’, Nature 399, 662-665.CrossRefADSGoogle Scholar
  17. Elliot, J. L. and Olkin, C. B.: 1996, ‘Probing Planetary Atmospheres with StellarOccultations’, Annu. Rev. Earth Planet. Sci. 24, 89-123.CrossRefADSGoogle Scholar
  18. Farnham, T., Schleicher, D., and Lederer, S.: 1997, ‘Comet C/1995 O1 (Hale-Bopp)’, IAU Circ. 6589.Google Scholar
  19. Fernández, J. A., Tancredi, G., Rickman, H., and Licandro, J.: 1999, ‘The Population, Magnitudes, and Sizes of Jupiter Family Comets’, A. & A. 352, 327-340.ADSGoogle Scholar
  20. Fernández, Y. R.: 1999, ‘Physical Properties of Cometary Nuclei’, Ph.D. Thesis, University of Maryland, College Park.Google Scholar
  21. Fernández, Y. R., Jewitt, D. C., and Sheppard, S. S.: 2002, ‘Thermal Properties of Centaurs Asbolus and Chiron’, A.J. 123, 1050-1055.CrossRefADSGoogle Scholar
  22. Fernández, Y. R., Lisse, C. M., Käufl, H. U., Peschke, S. B., Weaver, H. A., A'Hearn, M. F., Lamy, P. L., Livengood, T. A., and Kostiuk, T.: 2000, ‘Physical Properties of the Nucleus of Comet 2P/Encke’, Icarus 147, 145-160.CrossRefADSGoogle Scholar
  23. Fernández, Y. R., Wellnitz, D. D., Buie, M. W., Dunham, E. W., Millis, R. L., Nye, R. A., Stansberry, J. A., Wasserman, L. H., A'Hearn, M. F., Lisse, C. M., Golden, M. E., Person, M. J., Howell, R. R., Marcialis, R. L., and Spitale, J. N.: 1999, ‘The Inner Coma and Nucleus of Hale-Bopp: Results from a Stellar Occultation’, Icarus 140, 205-220.CrossRefADSGoogle Scholar
  24. Groussin, O., Peschke, S., and Lamy, P. L.: 2000, ‘Properties of 2060 Chiron from Infrared ISOPHOT Observations’, Bull. Amer. Astron. Soc. 32, 1031-1031.ADSGoogle Scholar
  25. Hainaut, O., West, R. M., Marsden, B. G., Smette, A., and Meech, K.: 1995, ‘Post-Perihelion Observations of Comet P/Halley. IV. r=16.6 and 18.8 AU’, A. & A. 293, 941-947.ADSGoogle Scholar
  26. Hanner, M. S., Gehrz, R. D., Harker, D. E., Hayward, T. L., Lynch, D. K., Mason, C. C., Russell, R. W., Williams, D. M., Wooden, D. H., and Woodward, C. E.: 1997, ‘Thermal Emission from the Dust Coma of Comet Hale-Bopp and the Composition of the Silicate Grains’, Earth Moon Planets 79, 247-264.CrossRefADSGoogle Scholar
  27. Harmon, J. K., Campbell, D. B., Ostro, S. J., and Nolan, M. C.: 1999, ‘Radar Observations of Comets’, Planet. Space Sci. 47, 1409-1422.CrossRefADSGoogle Scholar
  28. Harmon, J. K., Ostro, S. J., Benner, L. A. M., Rosema, K. D., Jurgens, R. F., Winkler, R., Yeomans, D. K., Choate, D., Cormier, R., Giorgini, J. D., Mitchell, D. L., Chodas, P. W., Rose, R., Kelley, D., Slade, M. A., and Thomas, M. L.: 1997, ‘Radar Detection of the Nucleus and Coma of Comet Hyakutake (C/1996 B2)’, Science 278, 1921-1922.CrossRefADSGoogle Scholar
  29. Harris, W. M., Morgenthaler, J. P., Scherb, E., Anderson, C., and Oliversen, R. J.: 2002, ‘Wide Field Imaging and the Velocity Structure in the Coma of Hale-Bopp’, these proceedings.Google Scholar
  30. Jewitt, D.: 1991, ‘Cometary Photometry’, in R. L. Newburn, Jr., M. Neugebauer, and J. Rahe (eds.), Comets in the Post-Halley Era, Kluwer Academic Publishers, Dordrecht.Google Scholar
  31. Jewitt, D.: 1997, ‘Cometary Rotation’, Earth Moon Planets 79, 35-53.CrossRefADSGoogle Scholar
  32. Jewitt, D. and Matthews, H.: 1999, ‘Particulate Mass Loss from Comet Hale-Bopp’, A.J. 117, 1056-1062.CrossRefADSGoogle Scholar
  33. Jorda, L., Lamy, P., Groussin, O., Toth, I., A'Hearn, M. F., and Peschke, S.: 2000, ‘ISOCAM Observations of Cometary Nuclei’, in R. J. Laureijs, K. Leech, and M. F. Kessler (eds.), ESA SP-455: ISO Beyond Point Sources, European Space Agency, Noordwijk.Google Scholar
  34. Jorda, L., Rembor, K., Lecacheux, J. Colom, P., Colas, F., Frappa, E., and Lara, L. M.: 1997, ‘The Rotational Parameters of Hale-Bopp (C/1995 O1) from Observations of the Dust Jets At Pic du Midi Observatory’, Earth Moon Planets 77, 167-180.CrossRefADSGoogle Scholar
  35. Julian, W. H., Samarasinha, N. H., and Belton, M. J. S.: 2000, ‘Thermal Structure of Cometary Active Regions: Comet 1P/Halley’, Icarus 144, 160-171.CrossRefADSGoogle Scholar
  36. Keller, H. U., Arpigny, C., Barbieri, C., Bonnet, R. M., Cazes, S., Coradini, M., Cosmovici, C. B., Delamere, W. A., Huebner, W. F., Hughes, D. W., Jamar, C., Malaise, D., Reisema, H. J., Schmidt, H. U., Schmidt, W. K. H., Seige, P., Whipple, F. L., and Wilhelm, K.: 1986, ‘First Halley Multicolour Camera Imaging Results from Giotto’, Nature 321, 320-326.CrossRefADSGoogle Scholar
  37. Kidger, M. R.: 1997, ‘Dust Activity in Comet Hale-Bopp’, Earth Moon Planets 79, 79-102.CrossRefADSGoogle Scholar
  38. Kresák, L. and Kresáková, M.: 1987, ‘The Mass Loss Rate of Periodic Comets’, in B. Battrick (eds.), Diversity and Similarity in Comets, European Space Agency, Noordwijk.Google Scholar
  39. Lamy, P. L., Jorda, L., Toth, I., Groussin, O., A'Hearn, M. F., and Weaver, H. A.: 1999a, ‘Characterization of the Nucleus of Comet Hale-Bopp from HST and ISO Observations’, Bull. Amer. Astron. Soc. 31, 1116-1116.ADSGoogle Scholar
  40. Lamy, P. L., Toth, I., A'Hearn, M. F., and Weaver, H. A.: 1999b, ‘Hubble Space Telescope Observations of the Nucleus of Comet 45P/Honda-Mrkos-Pajdusakova and its Inner Coma’, Icarus 140, 424-438.CrossRefADSGoogle Scholar
  41. Lamy, P. L., Toth, I., and Weaver, H. A.: 1998, ‘Hubble Space Telescope Observations of the Nucleus and Inner Coma of Comet 19P/1904 Y2 (Borrelly)’, A. & A. 337, 945-954.ADSGoogle Scholar
  42. Lebofsky, L. A. and Spencer, J. S.: 1989, ‘Radiometry and Thermal Modeling of Asteroids’, in R. P. Binzel, T. Gehrels, and M. S. Matthews (eds.), Asteroids II, University of Arizona Press, Tucson.Google Scholar
  43. Lederer, S. M.: 2000, ‘The Chemical and Physical Properties of the OH, CN, and C2 Jets in Comet Hale-Bopp (1995 O1)’, Ph.D. Thesis, University of Florida.Google Scholar
  44. Licandro, J., Bellot Rubio, L. R., Boehnhardt, H., Casas, R., Goetz, B., Gómez, A., Jorda, L., Kidger, M. R., Osip, D., Sabalisck, N., Santos, P., Serra-Ricart, M., Tozzi, G. P., and West, R.: 1998, ‘The Rotation Period of C/1995 O1 (Hale-Bopp)’, Ap. J. 501, L221-L225.CrossRefADSGoogle Scholar
  45. Licandro, J., Bellot Rubio, L. R., Casas, R., Gómez, A., Kidger, M. R., Sabalisk, N., Santos-Sanz, P., Serra-Ricart, M., Torres-Chico, R., Oscoz, A., Jorda, L., and Denicolo, G.: 1997, ‘The Spin Axis Position of C/1995 O1 (Hale-Bopp)’, Earth Moon Planets 77, 199-206.CrossRefADSGoogle Scholar
  46. Lisse, C. M., A'Hearn, M. F., Hauser, M. G., Kelsall, T., Lien, D. J., Moseley, S. H., Reach, W. T., and Silverberg, R. F.: 1998, ‘Infrared Observations of Comets by COBE’, Ap. J. 496, 971-991.CrossRefADSGoogle Scholar
  47. Lisse, C. M., Fernández, Y. R., A'Hearn, M. F., Kostiuk, T., Livengood, T., Käufl, H. U., Hoffmann, W. F., Dayal, A., Ressler, M. E., Hanner, M. S., Fazio, G. G., Hora, J. L., Peschke, S. B., Grün, E., and Deutsch, L. K.: 1997, ‘Infrared Observations of Dust Emission from Comet Hale-Bopp’, Earth Moon Planets 78, 251-257.CrossRefADSGoogle Scholar
  48. Lisse, C. M., Fernández, Y. R., Kundu, A., A'Hearn, M. F., Dayal, A., Deutsch, L. K., Fazio, G. G., Hora, J. L., and Hoffmann, W. F.: 1999, ‘The Nucleus of Comet Hyakutake (C/1996 B2)’, Icarus 140, 189-204.CrossRefADSGoogle Scholar
  49. Manzini, F., Guaita, C., and Crippa, F.: 1996, ‘Comet C/1995 O1 (Hale-Bopp)’, IAU Circ. 6463.Google Scholar
  50. Marchis, F., Boehnhardt, H., Hainaut, O. R., and Le Mignant, D.: 1999, ‘Adaptive Optics Observations of the Innermost Coma of C/1995 O1. Are There a “Hale” and a “Bopp” in Comet Hale-Bopp?’, A. & A. 349, 985-995.ADSGoogle Scholar
  51. Marsden, B. G.: 1969, ‘Comets and Nongravitational Forces. II.’, A.J. 74, 720-734.CrossRefADSGoogle Scholar
  52. Marsden, B. G.: 1997, ‘Orbit Evolution and Evolution of Comet C/1995 O1 (Hale-Bopp)’, Earth Moon Planets 79, 3-15.CrossRefADSGoogle Scholar
  53. Marsden, B. G., Sekanina, Z., and Yeomans, D. K.: 1973, ‘Comets and Nongravitational Forces. V.’, A.J. 78, 211-225.CrossRefADSGoogle Scholar
  54. Mason, C. G., Gehrz, R. D., Jones, T. J., Woodward, C. E., Hanner, M. S., and Williams, D. M.: 2001, ‘Observations of Unusually Small Dust Grains in the Coma of Comet Hale-Bopp C/1995 O1’, Ap. J. 549, 635-646.CrossRefADSGoogle Scholar
  55. Matson, D. L.: 1972, ‘1. Astronomical Photometry at Wavelengths of 8.5, 10.5, and 11.6 µm. 2. Infrared Emission from Asteroids atWavelengths 8.5, 10.5, and 11.6 µm’, Ph.D. Thesis, California Institute of Technology.Google Scholar
  56. McDonnell, J. A. M., Lamy, P. L., and Pankiewicz, G. S.: 1991, ‘Physical Properties of Cometary Dust’, in R. L. Newburn, Jr., M. Neugebauer, and J. Rahe (eds.), Comets in the Post-Halley Era, Kluwer Academic Publishers, Dordrecht.Google Scholar
  57. McNaught, R. H.: 1995, ‘Comet C/1995 O1 (Hale-Bopp)’, IAU Circ. 6198.Google Scholar
  58. Meech, K. J., Buie, M. W., Samarasinha, N. H., Mueller, B. E. A., and Belton, M. J. S.: 1997, ‘Observations of Structures in the Inner Coma of Chiron with the HST Planetary Camera’, A.J. 113, 844-862.CrossRefADSGoogle Scholar
  59. Millis, R. L., A'Hearn, M. F., and Campins, H.: 1988, ‘An Investigation of the Nucleus and Coma of Comet P/Arend-Rigaux’, Ap. J. 324, 1194-1209.CrossRefADSGoogle Scholar
  60. Molina, A., and Moreno, F.: 1999, ‘Comet Hale-Bopp as a Free-Rotation Rigid Body’, A. & A. 347, 366-369.ADSGoogle Scholar
  61. Morrison, D.: 1973, ‘Determination of Radii of Satellites and Asteroids from Radiometry and Photometry’, Icarus 19, 1-14.CrossRefADSGoogle Scholar
  62. Müller, M., Green, S. F., and McBride, N.: 2002, ‘An Easy-to-Use Model for the Optical Thickness and Ambient Illumination within Cometary Dust Comae’, these proceedings.Google Scholar
  63. Müller, T. G. and Lagerros, J. S. V.: 1998, ‘Asteroids as Far-Infrared Photometric Standards for ISOPHOT’, A. & A. 338, 340-352.ADSGoogle Scholar
  64. Ostro, S. J.: 1982, ‘Radar Properties of Europa, Ganymede, and Callisto’, in D. Morrison (eds.), Satellites of Jupiter, University of Arizona Press, Tucson.Google Scholar
  65. Prialnik, D.: 2002, ‘Modeling the Comet Nucleus Interior. Application to Comet C/1995 O1 Hale-Bopp’, these proceedings.Google Scholar
  66. Qi, C.: 2000, ‘Aperture Synthesis Studies of the Chemical Composition of Protoplanetary Disks and Comets’, Ph.D. Thesis, Caltech.Google Scholar
  67. Salo, H.: 1988, ‘Monte Carlo Modeling of the Net Effects of Coma Scattering and Thermal Reradiation on the Energy Input to Cometary Nucleus [sic]’, Icarus 76, 253-269.CrossRefADSGoogle Scholar
  68. Samarasinha, N. H.: 2000, ‘The Coma Morphology Due to an Extended Active Region and the Implications for the Spin State of Comet Hale-Bopp’, Ap. J. 529, L107-L110.CrossRefADSGoogle Scholar
  69. Samarasinha, N. H. and Belton, M. J. S.: 1995, ‘Long-Term Evolution of Rotational Stress and Nongravitational Effects for Halley-Like Cometary Nuclei’, Icarus 116, 340-358.CrossRefADSGoogle Scholar
  70. Samarasinha, N. H., Mueller, B. E. A., and Belton, M. J. S.: 1997, ‘Coma Morphology and Constraints on the Rotation of Comet Hale-Bopp (C/1995 O1)’, Earth Moon Planets 77, 189-198.CrossRefADSGoogle Scholar
  71. Sarmecanic, J., Fomenkova, M., Jones, B., and Lavezzi, T.: 1997, ‘Constraints on the Nucleus and Dust Properties from Mid-Infrared Imaging of Comet Hyakutake’, Ap. J. 483, L69-L72.CrossRefADSGoogle Scholar
  72. Schleicher, D. G., Lederer, S. M., Millis, R. L., and Farnham, T. L.: 1997, ‘Photometric Behavior of Comet Hale-Bopp (C/1995 O1) before Perihelion’, Science 275, 1913-1915.CrossRefADSGoogle Scholar
  73. Sekanina, Z.: 1988, ‘Nucleus of Comet IRAS-Araki-Alcock (1983 VII)’, A.J. 95, 1876-1894.CrossRefADSGoogle Scholar
  74. Sekanina, Z.: 1997a, ‘A Determination of the Nuclear Size of Comet Hale-Bopp (C/1995 O1)’, Earth Moon Planets 77, 147-153.CrossRefADSGoogle Scholar
  75. Sekanina, Z.: 1997b, ‘Detection of a Satellite Orbiting the Nucleus of Comet Hale-Bopp (C/1995 O1)’, Earth Moon Planets 77, 155-163.CrossRefADSGoogle Scholar
  76. Sekanina, Z. and Boehnhardt, H.: 1997, ‘Comet C/1995 O1 (Hale-Bopp)’, IAU Circ. 6542.Google Scholar
  77. Soderblom, L. A., Becker, T. L., Bennett, G., Boice, D. C., Britt, D. T., Brown, R. H., Buratti, B. J., Isbell, C., Giese, B., Hare, T., Hicks, M. D., Howington-Kraus, E., Kirk, R. L., Lee, M., Nelson, R. M., Oberst, J., Owen, T. C., Rayman, M. D., Sandel, B. R., Stern, S. A., Thomas, N., and Yelle, R. V.: 2002, ‘Observations of Comet 19P/Borrelly by the Miniature Integrated Camera and Spectrometer Aboard Deep Space 1’, Science 296, 1087-1091.CrossRefADSGoogle Scholar
  78. Vasundhara, R. and Chakraborty, P.: 1999, ‘Modeling of Jets from Comet Hale-Bopp (C/1995 O1): Observations from the Vainu Bappu Observatory’, Icarus 140, 221-230.CrossRefADSGoogle Scholar
  79. Weaver, H. A. and Lamy, P. L.: 1997, ‘Estimating the Size of Hale-Bopp's Nucleus’, Earth Moon Planets 79, 17-33.CrossRefADSGoogle Scholar
  80. Weaver, H. A., Feldman, P. D., A'Hearn, M. F., and Arpigny, C.: 1997, ‘The Activity and Size of the Nucleus of Comet Hale-Bopp (C/1995 O1)’, Science 275, 1900-1904.CrossRefADSGoogle Scholar
  81. Weaver, H. A., Feldman, P. D., A'Hearn, M. F., Arpigny, C., Brandt, J. C., and Stern, S. A.: 1999, ‘Post-Perihelion HST Observations of Comet Hale-Bopp (C/1995 O1)’, Icarus 141, 1-12.CrossRefADSGoogle Scholar
  82. Weissman, P. R. and Kieffer, H. H.: 1981, ‘Thermal Modeling of Cometary Nuclei’, Icarus 47, 302-311.CrossRefADSGoogle Scholar
  83. Weissman, P. R. and Lowry, S. C.: 2001, ‘The Size Distribution of Cometary Nuclei’, Bull. Amer. Astron. Soc. 33, 1094-1094.ADSGoogle Scholar

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© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Yanga R. Fernández
    • 1
  1. 1.Institute for AstronomyUniversity of HawaiiHonoluluUSA

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