Journal ArticleDOI
Voyager disk-integrated photometry of triton.
J. Hillier,Paul Helfenstein,Anne Verbiscer,J. Veverka,Robert H. Brown,Jay D. Goguen,Torrence V. Johnson +6 more
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TLDR
Hapke's photometric model has been combined with a plane-parallel thin atmospheric haze model to describe Voyager whole-disk observations of Triton, in the violet, blue, and green wavelength bands, to obtain estimates ofTriton's geometricAlbedo, phase integral, and Bond albedo.Abstract:
Hapke's photometric model has been combined with a plane-parallel thin atmospheric haze model to describe Voyager whole-disk observations of Triton, in the violet (0.41 microm), blue (0.48 microm), and green (0.56 microm) wavelength bands, in order to obtain estimates of Triton's geometric albedo, phase integral, and Bond albedo. Phase angle coverage in these filters ranging from approximately 12 degrees to 159 degrees was obtained by combining narrow- and wide-angle camera images. An upturn in the data at the highest phase angles observed can be explained by including scattering in a thin atmospheric haze layer with optical depths systematically decreasing with wavelength from approximately 0.06 in the violet to 0.03 for the green filter data. The geometric albedo, phase integral, and spherical albedo of Triton in each filter corresponding to our best fit Hapke parameters yield an estimated Bond albedo of 0.82 +/- 0.05. If the 14-microbar N(2) atmosphere detected by Voyager is in vapor equilibrium with the surface (therefore implying a surface temperature of 37.5 K), our Bond albedo implies a surface emissivity of 0.59 +/- 0.16.read more
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Journal ArticleDOI
Photometric functions for photoclinometry and other applications
TL;DR: In this paper, the Minnaert and lunar-Lambert functions are given least-squares fits to the brightness profiles across a disk, or "limb darkening", described by Hapke's photometric function.
Journal ArticleDOI
The lunar opposition surge : observations by clementine
TL;DR: The Clementine mission to the Moon in 1994 provided the first multispectral observations of the Moon opposition surge below a few degrees as discussed by the authors, which suggests that the principal cause of the lunar opposition surge is shadow hiding, while coherent backscatter, if present, makes only a minor contribution.
Journal ArticleDOI
Global albedos of Pluto and Charon from LORRI New Horizons observations
B. J. Buratti,Jason D. Hofgartner,Michael D. Hicks,Harold A. Weaver,S. A. Stern,Tom Momary,J. A. Mosher,Ross A. Beyer,A. J. Verbiscer,Amanda M. Zangari,Leslie A. Young,Carey M. Lisse,Kelsi N. Singer,Andrew F. Cheng,William M. Grundy,Kimberly Ennico,Catherine B. Olkin +16 more
TL;DR: For example, New Horizons images of the entire illuminated surface of Pluto and Charon obtained by the Long Range Reconnaissance Imager (LORRI) camera provide a global map of Pluto that reveals surface albedo variegations larger than any other Solar System world except for Saturn's moon Iapetus as discussed by the authors.
Journal ArticleDOI
New Horizons Mapping of Europa and Ganymede
William M. Grundy,Bonnie J. Buratti,Andrew F. Cheng,Joshua P. Emery,Allen W. Lunsford,William B. McKinnon,Jeffrey M. Moore,S. Newman,Catherine B. Olkin,Dennis C. Reuter,Paul M. Schenk,John R. Spencer,S. A. Stern,Henry B. Throop,Harold A. Weaver +14 more
TL;DR: Visual wavelength images of Europa extend knowledge of its global pattern of arcuate troughs and show that its surface scatters light more isotropically than other icy satellites.
Journal ArticleDOI
Ganymede and Callisto - Surface textural dichotomies and photometric analysis
TL;DR: In this paper, complete solar phase curves of the Ganymede and Callisto leading and trailing hemispheres are obtained by reducing Voyager imaging observations and combining them with ground-based telescopic data, in order to derive hemispherical values of the single scattering albedo, the single particle phase function (SPPF), the compaction state (CS) of the optically active portion of the regolith, and the mean slope angle of macroscopic features.
References
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Journal ArticleDOI
Bidirectional reflectance spectroscopy: 1. Theory
TL;DR: In this article, an approximate analytic solution for the radiative transfer equation describing particulate surface light scattering, taking into account multiple scattering and mutual shadowing, was derived for the interpretation of reflectance spectroscopy of laboratory surfaces and the photometry of solar system objects.
Journal ArticleDOI
Bidirectional reflectance spectroscopy 3. Correction for macroscopic roughness
TL;DR: In this article, a mathematically rigorous formalism is derived by which an arbitrary photometric function for the bidirectional reflectance of a smooth surface may be corrected to include effects of general macroscopic roughness.
Journal ArticleDOI
Bidirectional reflectance spectroscopy. IV - The extinction coefficient and the opposition effect
TL;DR: In this paper, an analytical model was developed for the opposition effect (heiligenshein) in the case of light scattering from a semi-infinite, particulate medium with particles that are large relative to the wavelength.
Journal ArticleDOI
Voyager 2 at neptune: imaging science results.
Bradford A. Smith,L. A. Soderblom,Don Banfield,C. D. Barnet,Alexander T. Basilevsky,Reta Beebe,K. Bollinger,Joseph M. Boyce,André Brahic,G. A. Briggs,Robert H. Brown,Christopher F. Chyba,Stewart A. Collins,Tim R. Colvin,A. F. Cook,David Crisp,Steven K. Croft,Dale P. Cruikshank,Jeffrey N. Cuzzi,G. E. Danielson,Merton E. Davies,E. De Jong,Luke Dones,D. Godfrey,Jay D. Goguen,I. Grenier,V. R. Haemmerle,Heidi B. Hammel,Candice Hansen,c. P. Helfenstein,Chris Howell,G. E. Hunt,Andrew P. Ingersoll,Torrence V. Johnson,Jeffrey S. Kargel,R. L. Kirk,D. I. Kuehn,Sanjay S. Limaye,Harold Masursky,Alfred S. McEwen,David Morrison,Tobias Owen,William M. Owen,James B. Pollack,Carolyn C. Porco,K. Rages,P. Rogers,D. Rudy,C. Sagan,Joel M. Schwartz,Eugene M. Shoemaker,Mark R. Showalter,Bruno Sicardy,Damon P. Simonelli,John R. Spencer,Lawrence A. Sromovsky,Carol R. Stoker,Robert G. Strom,Verner E. Suomi,S. P. Synott,Richard J. Terrile,Peter C. Thomas,W. R. Thompson,A. Verbiscer,J. Veverka +64 more
TL;DR: New Voyager 2 images of Neptune reveal a windy planet characterized by bright clouds of methane ice suspended in an exceptionally clear atmosphere above a lower deck of hydrogen sulfide or ammonia ices, dominated by a large anticyclonic storm system that has been named the Great Dark Spot.
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