Voyager disk-integrated photometry of triton

J. Hillier, P. Helfenstein, A. Verbiscer, J. Veverka, Robert H. Brown, J. Goguen, T. V. Johnson

Research output: Contribution to journalArticle

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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 μm), blue (0.48 μm), and green (0.56 μm) 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 ∼12° to 159° 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 ∼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-μbar N2 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.

Original languageEnglish (US)
Pages (from-to)419-421
Number of pages3
JournalScience
Volume250
Issue number4977
StatePublished - 1990
Externally publishedYes

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albedo
photometry
haze
filters
phase shift
emissivity
wavelengths
optical thickness
surface temperature
cameras
vapors
atmospheres
estimates
scattering

ASJC Scopus subject areas

  • General

Cite this

Hillier, J., Helfenstein, P., Verbiscer, A., Veverka, J., Brown, R. H., Goguen, J., & Johnson, T. V. (1990). Voyager disk-integrated photometry of triton. Science, 250(4977), 419-421.

Voyager disk-integrated photometry of triton. / Hillier, J.; Helfenstein, P.; Verbiscer, A.; Veverka, J.; Brown, Robert H.; Goguen, J.; Johnson, T. V.

In: Science, Vol. 250, No. 4977, 1990, p. 419-421.

Research output: Contribution to journalArticle

Hillier, J, Helfenstein, P, Verbiscer, A, Veverka, J, Brown, RH, Goguen, J & Johnson, TV 1990, 'Voyager disk-integrated photometry of triton', Science, vol. 250, no. 4977, pp. 419-421.
Hillier J, Helfenstein P, Verbiscer A, Veverka J, Brown RH, Goguen J et al. Voyager disk-integrated photometry of triton. Science. 1990;250(4977):419-421.
Hillier, J. ; Helfenstein, P. ; Verbiscer, A. ; Veverka, J. ; Brown, Robert H. ; Goguen, J. ; Johnson, T. V. / Voyager disk-integrated photometry of triton. In: Science. 1990 ; Vol. 250, No. 4977. pp. 419-421.
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AB - 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 μm), blue (0.48 μm), and green (0.56 μm) 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 ∼12° to 159° 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 ∼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-μbar N2 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.

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