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Gutta

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Definition

Relatively dark, irregular spot surrounded by a bright halo on Triton, the satellite of Neptune.

Synonyms

Zoned Macula

Plural

Guttae

Description

Guttae are irregularly shaped, relatively dark spots with bright annular features around them, known as Aureoles, that were seen by the Voyager spacecraft Smith et al. (1989) in the southern hemisphere of Neptune’s satellite Triton (Fig. 1). These features are about 50–80 km in diameter (Croft 1993). Bright plains with a number of topographic irregularities surround the guttae and aureoles. This topography extends and protrudes into the aureole materials, and in some cases into the guttae themselves, indicating that the plains units lay beneath these features. The smooth textures of both units are, however, distinct from the textures of surrounding plains units.

Fig. 1
figure 1

Oblique view of guttae on Triton near 25°S 65°E on Abatos Planum. The two in the middle are Akupara Maculae; the complex on the lower rightis Zin Maculae. Voyager...

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Fig. 1

References

  • Becerra P, Byrne S (2011) Mars’ South Polar Halos and Triton’s Aureoles: sublimation driven models of formation. New horizons workshop on icy surface processes. http://www2.lowell.edu/workshops/aug2011/workshop_abstracts/becerra.pdf

  • Becerra P, Byrne S, Brown AJ (2014) “Transient Bright “Halos” on the South Polar Residual Cap of Mars: Implications for Mass Balance”. Icarus (in press for the Dynamic Mars Special issue). doi:10.1016/j.icarus.2014.04.050

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  • Croft SK (1993) Geomorphology of Triton’s polar materials. Lunar Planet Sci Conf XXIV:345–346, Houston

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  • Croft SK, Kargel JS, Kirk RL, Moore JM, Schenk PM, Strom RG (1995) The geology of Triton. In: Cruikshank DP (ed) Neptune and Triton. University of Arizona Press, Tucson, pp 879–948

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  • Smith BA, Soderblom LA, Banfield D, Bartnet C et al (1989) Voyager 2 at Neptune: imaging science results. Science 246(4936):1422–1449

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Correspondence to Patricio Becerra .

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© 2014 Springer Science+Business Media New York

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Becerra, P. (2014). Gutta. In: Encyclopedia of Planetary Landforms. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9213-9_442-1

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  • DOI: https://doi.org/10.1007/978-1-4614-9213-9_442-1

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  • Online ISBN: 978-1-4614-9213-9

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