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Observations of Halley's Comet and Venus [PDF]
Nature, 1910 IT may interest readers of NATURE to know that the planet Venus was visible—plainly visible—in Natal all day to-day up to the time of its setting. The air was wonder fully clear and free from dust or moisture. At four o'clock in the morning Venus was unusually brilliant, the light therefrom shining into my bedroom. Halley's comet rose above the horizon
openaire +3 more sources
Report of the Terrestrial Bodies Science Working Group. Volume 9: Complementary research and development [PDF]
Topics discussed include the need for: the conception and development of a wide spectrum of experiments, instruments, and vehicles in order to derive the proper return from an exploration program; the effective use of alternative methods of data ...
Fanale, F. P. +3 more
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Mission summary: Halley flyby/Tempel-2 rendezvous [PDF]
A unique dual-comet flight opportunity exists in mid-1985 which includes flyby of the large and active comet Halley en route to rendezvous with second comet, Tempel-2.
Atkins, K.
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The 10 micron spectral structure in comets [PDF]
The 10 micron spectra of comets Halley (1982i), Wilson (1986l), Kohoutek (1973f) and Bradfield (1987s) are presented and compared. The silicate emission profiles of Halley and Bradfield are seen to be remarkably similar in that both contain a sharp break
Campins, Humberto +2 more
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Giotto Extended Mission (GEM) [PDF]
The primary objectives of the Giotto Extended Mission (GEM), are to determine the composition and physical state of the Grigg Skjellerup Comet's nucleus; to determine the processes that govern the composition and distribution of neutral and ionized ...
Grensemann, M., Wilkins, D. E. B.
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Ion propulsion and Comet Halley rendezvous [PDF]
Cometary rendezvous missions using ion propulsion is considered. The characteristics of the ion engine are discussed including the fuel efficiency and acceleration, and the design of the ion engine is described.
Atkins, K. L.
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Comparison of the 3.36 micrometer feature to the ISM [PDF]
It has been noted that the 3.36 micrometer emission feature is not the same as that of any ISM band at 3.4 micrometer. This is documented herein. There is no convincing analog to the cometary 3.36 micrometer emission feature seen in the Interstellar ...
Brooke, Timothy Y., Tokunaga, Alan T.
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