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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 721 records · Page 40
All sourcesNASA NTRSDOE OSTI
NASA NTRS1971

Imaging of Mercury and Venus from a flyby.

Study of an imaging experiment planned for the 1973 Mariner Venus/Mercury flyby mission. Scientific objectives are presented together with mission constraints, analysis of alternative systems, and the rationale for the final choice. The final selection was a vidicon camera quite similar to that used for Mariner Mars 1971, but with the capability of real time transmission during the Venus and Mercury flybys. Systematic high resolution UV photography of Venus is planned after encounter in an attempt to understand the nature of the mysterious UV markings and their apparent 4- to 5-day rotation period.

Murray, B. C.↗
NASA NTRS1972

Lunar and Planetary Laboratory studies of Jupiter. II.

Discussion of Jovian belts, zones and atmospheric features as identified by an analysis of photographs of the planet at the Laboratory. The topics include the circulation of the Jovian atmosphere, the rotation periods of zones and belts, the Great Red Spot shown by methane photographs, and some high altitude photographs of terrestrial atmospheric conditions. Hypothetical mechanisms controlling the atmospheric conditions on Jupiter are considered.

Kuiper, G. P.↗
NASA NTRS1973

Infrared site testing of Mt. Lemmon and Catalina Observatory

The operation and problems involved with two sky noise meters installed in the Catalina Mountains near Tucson, Arizona are discussed. The instruments were installed at two different locations on Mt. Lemon. It was found that when photometric conditions prevailed, a positive correlation existed between the outputs of the two instruments. In particular, the strongdiurnal effect, in which the sky noise increases abruptly at sunrise and falls markedly after sunset, was reproduced by both instruments. Discrepancies in data recorded by the two instruments are analyzed and possible causes for the discrepancies are proposed.

Kuiper, G. P.↗
NASA NTRS1972

Comets: Scientific data and missions; Proceedings of the Tucson Comet Conference, University of Arizona, Tucson, Ariz., April 8, 9, 1970.

Current knowledge of comets is surveyed, and comet-rendezvous mission constraints, opportunities, modes, and spacecraft capabilities are discussed. Attention is given to cometary nuclei, infrared measurements of comets, the nature and origin of the cometary head, L-alpha photometry of Comet Bennett, Types I and II tails, comet spectra and orbits, and evidence from stream meteoroids. Some scientific criteria for a cometary mission are considered. Individual items are announced in this issue.

Kuiper, G. P.↗
NASA NTRS1972

Water vapor in the atmosphere of Venus.

Infrared spectra of Venus produced by a Fourier spectrometer flown aboard the NASA CV 990 jet aircraft were analyzed for water-vapor content by comparison with calculated model spectra. The reflecting layer model gave an abundance of 1.6 plus or minus 0.4 micron of precipitable water for the two-way transmission of the Venus atmosphere. The scattering model resulted in a value of 0.25 plus or minus 0.10 micron of water per scattering mean free path. Neither is regarded as a definitive model, but derived mixing ratios will not be significantly in error. An abundance of CO2 using a number of bands, was determined for both models. The volume mixing ratios of H2O to CO2 obtained were 0.0000006 and 0.000001 for the reflecting layer and scattering model, respectively.

Fink, U.↗