Two-micron spectrophotometry of Uranus and its rings

Details Two-micron spectrophotometry of Uranus and its rings Two-micron spectrophotometry of Uranus and its rings

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...42...54n&link_type=abstract

Icarus, vol. 42, Apr. 1980, p. 54-67.

Astronomy and Astrophysics

Astronomy

7

Astronomical Photometry, Infrared Astronomy, Oberon, Planetary Composition, Uranus (Planet), Albedo, Ammonia, Ariel, Ariel Satellites, Methane, Spectral Reflectance, Spectrophotometry, Spectrum Analysis, Titania, Umbriel, Uranus Atmosphere, Uranus Rings, Uranus Satellites, Uranus, Rings, Spectrophotometry, Albedo, Spectrum, Reflectance, Dipole, Methane, Absorption, Ammonia, Frost, Silicates, Satellites, Ariel, Infrared, Umbriel, Titania, Oberon, Data, Observations, Wavelengths, Optical Properties, Equipment

Scientific paper

Multi-aperture K-band photometry, 2- to 1.5-micron spectrometry and JHK photometry of the Uranus system is presented. Observations were made on a 4-m telescope using an infrared spectrometer/photometer containing both a set of broadband JHK filters and a cooled circular variable filter with a resolving power of 60. The photometric results, which reveal the rings to be the main contributor to the 2.2-micron flux, are used to set limits on the brightnesses and geometric albedos of Uranus (brightness between 12.9 and 13.76 magnitudes; albedo between 0.000074 and 0.00015) and its rings (brightness between 11.83 and 12.1 magnitudes; albedo between 0.027 and 0.034). Reflectance spectra reveal planetary spectral features attributed to gaseous methane absorption and a 2.20-micron feature in the combined planet and ring spectra tentatively identified with either NH3 frost or silicate OH absorption in the rings. JHK photometry of the satellite Ariel shows it to have essentially the same J-H and H-K colors as the Uranus satellites Umbriel, Titania and Oberon, indicating the presence of H2O frost.

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