Infrared Observations Of Dust Emission From Comet Hale-Bopp
Lisse, C. M. ; Fernández, Y. R. ; A'hearn, M. F. ; Kostiuk, T. ; Livengood, T. A. ; 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. ; Deutsch, L. K.
Springer
Published 1997
Springer
Published 1997
| ISSN: |
1573-0794
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| Keywords: |
Comets ; infrared ; radio ; rotation ; surfaces ; origin
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| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Geosciences
Physics
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| Notes: |
Abstract We present infrared imaging and photometry of the bright, giant comet C/1995 O1 (Hale-Bopp). The comet was observed in an extended infrared and optical observing campaign in 1996–1997. The infrared morphology of the comet was observed to change from the 6 to 8 jet “porcupine” structure in 1996 to the “pinwheel” structure seen in 1997; this has implications for the position of the rotational angular momentum vector. Long term light curves taken at 11.3 μm indicate a dust production rate that varies with heliocentric distance as ∶ r−1.4. Short term light curves taken at perihelion indicate a rotational periodicity of 11.3 hours and a projected dust outflow speed of ∶ 0.4 km s−1. The spectral energy distribution of the dust on October 31, 1996 is well modeled by a mixture of 70% silicaceous and 30% carbonaceous non-porous grains, with a small particle dominated size distribution like that seen for comet P/Halley (McDonnell et al., 1991), an overall dust production rate of 2 × 105 kg s−1, a dust-to-gas ratio of ∶5, and an albedo of 39%.
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| Type of Medium: |
Electronic Resource
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| URL: |