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IUE observations of comet Halley during the Vega and Giotto encounters
Feldman, P. D.; A'Hearn, M. F.; Weaver, H. A. +9 more
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 during which the fleet of six spacecraft from four space agencies encountered the comet. The gaseous output of the nucleus was found to vary over timesc…
Post-perihelion observations of water in comet Halley
Weaver, H. A.; Davis, D. S.; Mumma, M. J. +1 more
Our previous pre-perihelion observations1 of comet Halley from the NASA Kuiper Airborne Observatory (KAO) resulted in the first definite detection of water vapour in a comet. This success allowed us to carry out an ambitious post-perihelion KAO observing programme which significantly extended the scope of our Halley water investigation.…
Is CO2 responsible for the outbursts of comet Halley?
Feldman, P. D.; A'Hearn, M. F.; Weaver, H. A. +3 more
Outbursts are thought to originate from the nucleus of comet Halley; cameras on the Vega and Giotto spacecraft have recorded the images of jets1,2, and rapid fluctuations are seen in the visible light curve, detected, for example, by the International Ultraviolet Explorer satellite during the time the spacecraft were making their observ…
The historical record for Sirius: evidence for a white-dwarf thermonuclear runaway?
Sion, Edward M.; Kondo, Yoji; Bruhweiler, Frederick C.
Schlosser and Bergmann1 recently presented evidence that in medieval times Sirius was a bright red star, rather than the present bluish-white star, from which they have suggested that Sirius B is a recently born white dwarf. However, their model poses severe evolutionary problems. We present the results of our attempts to detect possibl…
Space observations of comet Halley
Brandt, J. C.
Following the encounters by Soviet, Japanese and European spacecraft, the International Cometary Explorer took measurments of comet Halley on 22 March. The comet has also been observed by the Solar Maximum Mission, the International Ultraviolet Explorer, the Pioneer Venus Orbiter, the Dynamics Explorer 1, and by sounding rockets.