The effects of seeing on the reflected spectrum of Uranus and Neptune

Details The effects of seeing on the reflected spectrum of Uranus and Neptune The effects of seeing on the reflected spectrum of Uranus and Neptune

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....81..189m&link_type=abstract

Astronomy and Astrophysics, vol. 81, no. 1-2, Jan. 1980, p. 189-197.

Astronomy and Astrophysics

Astrophysics

6

Astronomical Spectroscopy, Image Motion Compensation, Neptune (Planet), Planetary Rotation, Spectral Reflectance, Uranus (Planet), Fraunhofer Lines, Frequency Shift, Line Shape, Line Spectra, Random Processes, Spectral Line Width, Spectrum Analysis, Visual Observation, Planets, Uranus, Neptune, Spectrum, Reflectivity, Analysis, Telescopic Observations, Parameters, Spectrograms, Stratoscope Ii, Brightness Distribution, Rotation, Periods, Mathematical Models, Velocities, Data, Comparisons, Image Processing, S

Scientific paper

The results of a redetermination of the rotational periods of Uranus and Neptune, based on spectrograms obtained with the coude spectrograph of the 5 m Hale telescope, are presented. The effects of image motion on the shape of the spectral lines reflected by a planet rotating as a solid body and coherently scattering solar light, has been studied analytically. A general relation between the seeing transformed velocities at any point on the disk and those at the equator is established. It is shown that, for the case of Gaussian seeing, the brightness continuum of the smeared disk contains all the information required to derive the shape of the reflected lines. The shift, change in r.m.s. width, and asymmetry of the seeing transformed lines at the equator have been numerically evaluated for the brightness distribution of Uranus determined from Stratoscope II.

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