# ESA Science & Technology - Publication Archive

## Publication archive

## Publication archive

Published: 30 March 2001

^{241}as a function of detector bias, we derive the electron mobility-lifetime product at -2 °C to be (2.9±0.2) x 10

^{-4}cm² V

^{-1}. This is about an order of magnitude higher than previously reported values.

Published: 01 February 2001

Published: 05 January 2001

Published: 05 January 2001

Published: 05 January 2001

Published: 05 January 2001

Published: 05 January 2001

Published: 01 December 1999

Published: 02 May 1999

Published: 02 May 1999

Published: 02 May 2000

Published: 01 January 1999

Published: 02 May 1997

_{60}. Four groups of the hydrocarbons are considered : Polyacetylenes (PA), Polyvinyles (PV), Vinylacetylenes (VA) and Allenes (Polyenes).

Published: 02 April 1997

Published: 15 December 1999

Bulletin of the American Astronomical Society, Vol 31, No. 4 (DPS)

Published: 02 September 1999

Published: 02 August 2000

Published: 01 January 2000

^{28}molecules s

^{-1}at perihelion, assuming a radius of 600 m. The calculated gas flux of water is within the order of measured values for comet 46P/Wirtanen. But our calculated values are maximum gas fluxes at noon—not averaged over one cometary day or taking the lesser insolation at the polar areas into account. Therefore, we conclude that either the radius of comet 46P/Wirtanen may be much larger than the accepted value of 600 m. A radius in the order of 2 km seems more likely to explain the measurements. Or, an other possibility could be that water-ice particles are blown off from the surface like dust particles. This may also increase the effective surface area of sublimation.

Published: 22 November 1998

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