Physics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997em%26p...78..251l&link_type=abstract
Earth, Moon, and Planets, v. 78, Issue 1/3, p. 251-257 (1997).
Physics
15
Comets, Infrared, Radio, Rotation, Surfaces, Origin
Scientific paper
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%.
A'Hearn Michael F.
Dayal Aditya
Deutsch Lynne K.
Fazio Giacomo
Fernandez Yan R.
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