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Optical polarimetry of P/Halley - Synthesis of the measurements in the continuum

Le Borgne, J. -F.; Bastien, P.; Levasseur-Regourd, A. C. +2 more

Ground-based observations of the linear polarization of P/Halley in the continuum by several independent groups of observers are analysed in common to produce synthetic polarization data. Curves of polarization as a function of phase angle are derived for the bright envelope around the nucleus, for the dust grains after they emerge from this envel…

Position of comet P/Halley at the Giotto encounter

Wilhelm, K.; Keller, H. U.; Curdt, W. +2 more

Images of the Halley Multicolor Camera (HMC) were analyzed to evaluate the fly-by geometry of the Giotto spacecraft past Comet Halley. The position of the comet at closest approach was determined with respect to the spacecraft. Based on the orbit information of Giotto the absolute position of the cometary nucleus could be obtained with very high p…

Detection of energetic electron (E greater than KeV) and ion fluxes (E greater than 97 KeV) from comet P/Halley by the Giotto experiment EPA on 1986 March 13/14

Neubauer, F. M.; Kirsch, E.; O'Sullivan, D. +2 more

Relativistic electron fluxes (greater than 220, greater than 300 KeV) were recorded during the Giotto encounter with comet P/Halley from the inbound to the outbound bowshock. A strong enhancement in the greater than 300 KeV electron flux was measured about 1 hr after the outbound crossing of the bow shock. It is suggested that the electrons were s…