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Published on: March 22, 2019
Infrared observations of the uranian system
Science (New York, N.Y.)
|July 4, 1986
Summary
Voyager 2
Area of Science:
- Planetary Science
- Infrared Spectroscopy
- Atmospheric Physics
Background:
- Voyager 2's Infrared Interferometer Spectrometer (IRIS) provided crucial data on Uranus and its moons.
- Understanding the atmospheric composition and temperature of Uranus is key to planetary science.
Purpose of the Study:
- To analyze thermal emission spectra and reflected solar radiation of Uranus, Miranda, and Ariel.
- To determine the atmospheric helium mole fraction and temperature profiles of Uranus.
- To calculate the effective temperature, Bond albedos, and surface microstructure of Uranus's moons.
Main Methods:
- Utilized the Infrared Interferometer Spectrometer (IRIS) on Voyager 2 for spectral measurements (200-500 cm⁻¹).
- Combined IRIS spectra with radio science data for atmospheric composition analysis.
- Derived vertical temperature profiles from polar and equatorial spectra.
Main Results:
- Determined Uranus's atmospheric helium mole fraction as 0.15 ± 0.05.
- Found nearly uniform temperatures (400-900 millibars) at poles and equator, with cooler mid-latitudes.
- Calculated effective temperature of Uranus at 59.4 K and Bond albedos for Miranda (0.24 ± 0.06) and Ariel (0.31 ± 0.06).
Conclusions:
- Uranus exhibits distinct temperature variations between its equator, poles, and mid-latitudes.
- Miranda and Ariel possess unusual surface microstructures, indicated by their albedo and phase integral estimates.
- The study refines our understanding of the atmospheric properties and surface characteristics of the Uranian system.
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