The radius and albedo of Hyperion

Details The radius and albedo of Hyperion The radius and albedo of Hyperion

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...37..307c&link_type=abstract

Icarus, vol. 37, Jan. 1979, p. 307-309.

Astronomy and Astrophysics

Astronomy

5

Albedo, Dimensional Measurement, Hyperion, Radii, Astronomical Photometry, Bolometers, Emissivity, Heat Flux, Radiometers, Radiometers, Flux, Satellites, Radius, Albedo, Hyperion, Surface, Photometry, Thermal Properties, Observations, Saturn, Colors

Scientific paper

A measurement of the 20-micron thermal flux from Hyperion is reported, and the radius and surface geometric albedo of this outer satellite of Saturn are computed by the photometric/radiometric method. A corrected and normalized 20-micron thermal flux of 0.033 + or - 0.012 Jy is determined. A radius of 112 + or - 15 km and a surface geometric albedo of 0.47 + or - 0.11 are obtained by assuming values of unity for the phase integral, emissivity, and bolometric/visual geometric-albedo ratio. The sensitivity of the photometric/radiometric method to the assumed values of the parameters involved is discussed, and the results are compared with similar studies of Triton. It is concluded that neither Hyperion nor Triton appears to have a geometric albedo in the lower end of the distribution of small bodies in the solar system.

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