Skip to main content


  • 68 Accesses


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


Zoned Macula




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...

This is a preview of subscription content, access via your institution.

Fig. 1


  • 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.

  • 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

    Google Scholar 

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

    Google Scholar 

  • 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

    Google Scholar 

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

    CrossRef  Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to Patricio Becerra .

Rights and permissions

Reprints and Permissions

Copyright information

© 2014 Springer Science+Business Media New York

About this entry

Cite this entry

Becerra, P. (2014). Gutta. In: Encyclopedia of Planetary Landforms. Springer, New York, NY.

Download citation

  • DOI:

  • Received:

  • Accepted:

  • Published:

  • Publisher Name: Springer, New York, NY

  • Online ISBN: 978-1-4614-9213-9

  • eBook Packages: Springer Reference Earth & Environm. ScienceReference Module Physical and Materials Science