Maps of a 3 by 2 arcmin region of the inner coma of comet Halley, at 10 arcsec resolution, in several principal atomic and molecular species were prepared by multiposition absolute spectrophotometry at 3.6 A resolution, in the wavelength range 3700 to 7598 A. The data form a subset of a larger data set collected at a range of heliocentric distances

Daily observations of solar global oscillations using a resonant scattering spectrometer have been obtained by observing integral sunlight during the summer seasons of the years 1977 to 1984. The power spectra of the daily residuals are calculated and the mean for each observing season is found. Several discrete frequency intervals are defined in

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Halo orbits of the earth (Farquhar, 1970) and their stationkeeping control are investigated analytically in the framework of the restricted three-body problem, and numerical algorithms based on the results are demonstrated, summarizing the report of Gomez et al. (1985). The semianalytical approach employed is explained; the halo-orbit neighborhood

The IRAS observations of well-known Seyfert galaxies have been studied in comparison with previously published ultraviolet and mid-infrared data. The mid- and far-infrared emission from Seyfert galaxies has an important extended component. Moreover, the UV-optical continuum is insufficient to account for the far-infrared emission via dust