Is the nucleus of comet Halley a low density body?

  title={Is the nucleus of comet Halley a low density body?},
  author={Roal'd. Z. Sagdeev and P. E. {\'E}l’yasberg and Vassili I. Moroz},
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… 

Structure and density of cometary nuclei

Abstract— Understanding the nature of the cometary nucleus remains one of the major problems in solar system science. Whipple's (1950) icy conglomerate model has been very successful at explaining a

Halley’s Comet (Part II): Space Studies

An international armada of spacecraft encountered Comet Halley in March 1986. The present article gives a brief overview of this unique event during which a cometary nucleus was seen as a spatially

The Thermal History and Structure of Cometary Nuclei

. Cometary nuclei are often considered to be the most primitive bodies of the solar system. Thus it is particularly important to find out what structural changes may have been brought about as a

Physical Properties of Comets

There have been several recent reviews of the physical properties of cometary nuclei, most concentrating on the speciics of the rotation periods, shapes, sizes and the surface properties. This review

The morphology of cometary nuclei

The sudden appearance of a bright comet stretching over a large part of the night sky must have been one of the most awesome phenomena for early humans watching the sky. The nature of comets remained

The Subsurface Structure and Density of Cometary Nuclei

Little is known about the internal structure and density of cometary nuclei. Indirect evidences available so far are not compelling and these questions essentially remain a matter of speculation. It

On the density of Halley's comet




Limits on the nucleus of Halley's Comet

We report here a limiting magnitude to the brightness of the nucleus of Halley's Comet which, together with published interpretations of the comet's visual light curve in 1910 and estimates of the

Activity of comet Halley Observed in the Ultraviolet (GRL 13(8) 1986)

The time variation of the water production rate of comet Halley during this apparition has been deduced from observations of the Ultraviolet Imager on board Suisei. The preperihelion production rates

An icy-glue model of cometary nuclei

Since 1950 a number of models have been proposed to explain the observations of comets. For the most part, the icy conglomerate model of Whipple1 has been the standard which others have followed. In

IUE observations of comet Halley during the Vega and Giotto encounters

The observations of comet Halley from the International Ultraviolet Explorer (IUE) satellite from 9 to 16 March 1986 allow a comprehensive study of gas and dust production by the comet in the week

P/Halley: The Quintessential Comet

Remote and in situ investigations from the ground, Earth orbit, Venus orbit, interplanetary space, and within the comet itself are expected to reveal much more in the coming year.

Television observations of comet Halley from Vega spacecraft

The television system (TVS) aboard the spacecraft Vega 1 and Vega 2 observed comet Halley from 4 to 11 March 1986, and transmitted ∼1,500 images to Earth. The best images of the cometary nucleus were

Dust and neutral gas modeling of the inner atmospheres of comets

This paper summarizes the present, preencounter understanding of the physical and chemical processes controlling the inner (r less than 1000 km) region of cometary atmospheres. Special emphasis was

Detection of Water Vapor in Halley's Comet

Gaseous, neutral H2O was detected in the coma of comet Halley on 22.1 and 24.1 December and the ortho-para ratio was found to be 2.66�0.13, possibly indicating that the observed water vapor originated from a low-temperature ice.