Is the nucleus of comet Halley a low density body?

@article{Sagdeev1988IsTN,
  title={Is the nucleus of comet Halley a low density body?},
  author={R. Z. Sagdeev and P. E. {\'E}l’yasberg and V. Moroz},
  journal={Nature},
  year={1988},
  volume={331},
  pages={240-242}
}
An important finding of the Vega and Giotto missions to comet Halley was evidence that the cometary nucleus is a consolidated body1–5. The shape, size and rotation of the nucleus were studied as well its albedo1–3 and surface temperature6–8. In determining the nature of the cometary nucleus, a value for the average density ρ would be informative. In this paper we estimate ρ to be 0.6 +0.9−0.4g cm−3 compatible with the 'snow-ball' models of the nucleus, although a more compact ice structure… Expand
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