Eros

Shape, topography, and slope processes

P. C. Thomas, J. Joseph, B. Carcich, J. Veverka, B. E. Clark, James Bell, A. W. Byrd, R. Chomko, Mark Robinson, S. Murchie, L. Prockter, A. Cheng, N. Izenberg, M. Malin, C. Chapman, L. A. McFadden, R. Kirk, M. Gaffey, P. G. Lucey

Research output: Contribution to journalArticle

116 Citations (Scopus)

Abstract

Stereogrammetric measurement of the shape of Eros using images obtained by NEAR's Multispectral Imager provides a survey of the major topographic features and slope processes on this asteroid. This curved asteroid has radii ranging from 3.1 to 17.7 km and a volume of 2535 ± 20 km3. The center of figure is within 52 m of the center of mass provided by the Navigation team; this minimal difference suggests that there are only modest variations in density or porosity within the asteroid. Three large depressions 10, 8, and 5.3 km across represent different stages of degradation of large impact craters. Slopes on horizontal scales of ∼300 m are nearly all less than 35°, although locally scarps are much steeper. The area distribution of slopes is similar to those on Ida, Phobos, and Deimos. Regions that have slopes greater than 25° have distinct brighter markings and have fewer large ejecta blocks than do flatter areas. The albedo patterns that suggest downslope transport of regolith have sharper boundaries than those on Phobos, Deimos, and Gaspra. The morphology of the albedo patterns, their lack of discrete sources, and their concentration on steeper slopes suggest transport mechanisms different from those on the previously well-observed small bodies, perhaps due to a reduced relative effectiveness of impact gardening on Eros. Regolith is also transported in talus cones and in connected, sinuous paths extending as much as 2 km, with some evident as relatively darker material. Talus material in at least one area is a discrete superposed unit, a feature not resolved on other small bodies. Flat-floored craters that apparently contain ponded material also suggest discrete units that are not well mixed by impacts.

Original languageEnglish (US)
Pages (from-to)18-37
Number of pages20
JournalIcarus
Volume155
Issue number1
DOIs
StatePublished - 2002
Externally publishedYes

Fingerprint

topography
slopes
asteroids
Deimos
asteroid
Phobos
talus
regolith
albedo
craters
crater
escarpments
ejecta
navigation
marking
center of mass
cones
porosity
degradation
radii

Keywords

  • Asteroids
  • Eros
  • Geodesy
  • Geology
  • NEAR

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Thomas, P. C., Joseph, J., Carcich, B., Veverka, J., Clark, B. E., Bell, J., ... Lucey, P. G. (2002). Eros: Shape, topography, and slope processes. Icarus, 155(1), 18-37. https://doi.org/10.1006/icar.2001.6755

Eros : Shape, topography, and slope processes. / Thomas, P. C.; Joseph, J.; Carcich, B.; Veverka, J.; Clark, B. E.; Bell, James; Byrd, A. W.; Chomko, R.; Robinson, Mark; Murchie, S.; Prockter, L.; Cheng, A.; Izenberg, N.; Malin, M.; Chapman, C.; McFadden, L. A.; Kirk, R.; Gaffey, M.; Lucey, P. G.

In: Icarus, Vol. 155, No. 1, 2002, p. 18-37.

Research output: Contribution to journalArticle

Thomas, PC, Joseph, J, Carcich, B, Veverka, J, Clark, BE, Bell, J, Byrd, AW, Chomko, R, Robinson, M, Murchie, S, Prockter, L, Cheng, A, Izenberg, N, Malin, M, Chapman, C, McFadden, LA, Kirk, R, Gaffey, M & Lucey, PG 2002, 'Eros: Shape, topography, and slope processes', Icarus, vol. 155, no. 1, pp. 18-37. https://doi.org/10.1006/icar.2001.6755
Thomas PC, Joseph J, Carcich B, Veverka J, Clark BE, Bell J et al. Eros: Shape, topography, and slope processes. Icarus. 2002;155(1):18-37. https://doi.org/10.1006/icar.2001.6755
Thomas, P. C. ; Joseph, J. ; Carcich, B. ; Veverka, J. ; Clark, B. E. ; Bell, James ; Byrd, A. W. ; Chomko, R. ; Robinson, Mark ; Murchie, S. ; Prockter, L. ; Cheng, A. ; Izenberg, N. ; Malin, M. ; Chapman, C. ; McFadden, L. A. ; Kirk, R. ; Gaffey, M. ; Lucey, P. G. / Eros : Shape, topography, and slope processes. In: Icarus. 2002 ; Vol. 155, No. 1. pp. 18-37.
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