Showing papers by "George H. Rieke published in 1974"
TL;DR: In this paper, the first large, homogeneous set of photoelectric and infrared photometry obtained for any comet is reported, which provides the first set of photometric data available for any known comet.
Abstract: Data are reported which provide the first large, homogeneous set of photoelectric and infrared photometry obtained for any comet. Assuming an albedo of 0.5 (a high albedo is assumed because of the large ratio of gas to dust in Kohoutek), the diameter of the nucleus of the comet is estimated to be 10 to 15 km. Based on a comparison with the infrared spectrum of Comet Bennett, it was calculated that the latter had about 16 times as much dust as Kohoutek. The data are used to obtain an evaluation of O'Dell's (1971) expression for the albedo of cometary dust grains in terms of the integrated infrared surface brightness and the surface brightness of scattered light in the continuum.
36 citations
TL;DR: In this article, a set of observations of Titan at wavelengths from 1.6 through 34 microns shows that Titan has a remarkably low albedo near 1.5 micron and an atmospheric model consistent with the observations is proposed for Titan.
Abstract: A set of observations of Titan at wavelengths from 1.6 through 34 microns shows that Titan has a remarkably low albedo near 1.6 micron. Thermal flux observations for 10 years at 10.6 microns and for 5 years at 21 microns suggest that the thermal properties of Titan remained constant over this period and are independent of phase. Narrowband photometry between 17 and 25 microns does not indicate the presence of a structure characteristic of a hydrogen-rich atmosphere. An atmospheric model consistent with the observations is proposed for Titan.-
32 citations
TL;DR: New measurements verify that Neptune is brighter than Uranus near 20 microns and show that both planets have increasing brightness temperature with decreasing wavelength between 34 and 22.5 microns as discussed by the authors.
Abstract: New measurements verify that Neptune is brighter than Uranus near 20 microns and show that both planets have increasing brightness temperature with decreasing wavelength between 34 and 22.5 microns. The observations are not compatible with existing models for the atmospheres of these planets.
22 citations
8 citations